\n
2.\u7ed3\u6784\u4f53\u7684\u8bf4\u660e<\/h3>\n
\u7ed3\u6784\u4f53\u58f0\u660e\u8bed\u6cd5<\/p>\n
struct tag
\n{
\n member-list; \/\/ \u6210\u5458\u5217\u8868
\n} variable-list; \/\/ \u53d8\u91cf\u5217\u8868（\u53ef\u9009）<\/p>\n
\n
\u793a\u4f8b：\u63cf\u8ff0\u4e00\u4e2a\u5b66\u751f<\/p>\n
struct Stu
\n{
\n char name[20]; \/\/ \u540d\u5b57
\n int age; \/\/ \u5e74\u9f84
\n char sex[5]; \/\/ \u6027\u522b
\n char id[20]; \/\/ \u5b66\u53f7
\n}; \/\/ \u5206\u53f7\u4e0d\u80fd\u4e22<\/p>\n
\n
3.\u7ed3\u6784\u4f53\u53d8\u91cf\u7684\u521b\u5efa\u548c\u521d\u59cb\u5316<\/h3>\n
\u5b8c\u6574\u793a\u4f8b<\/p>\n
#include <stdio.h><\/p>\n
struct Stu
\n{
\n char name[20]; \/\/ \u540d\u5b57
\n int age; \/\/ \u5e74\u9f84
\n char sex[5]; \/\/ \u6027\u522b
\n char id[20]; \/\/ \u5b66\u53f7
\n};<\/p>\n
int main()
\n{
\n \/\/ \u65b9\u5f0f1：\u6309\u7167\u7ed3\u6784\u4f53\u6210\u5458\u7684\u987a\u5e8f\u521d\u59cb\u5316
\n struct Stu s = { "hjq", 20, "\u7537", "20260818001" };
\n printf("name: %s\\\\n", s.name);
\n printf("age : %d\\\\n", s.age);
\n printf("sex : %s\\\\n", s.sex);
\n printf("id : %s\\\\n", s.id);<\/p>\n
printf("\\\\n"); \/\/ \u5206\u9694\u7ebf<\/p>\n
\/\/ \u65b9\u5f0f2：\u6309\u7167\u6307\u5b9a\u7684\u987a\u5e8f\u521d\u59cb\u5316（\u4f7f\u7528 .\u6210\u5458\u540d）
\n struct Stu s2 = { .age = 18, .name = "hjq", .id = "20260818002", .sex = "\u5973" };
\n printf("name: %s\\\\n", s2.name);
\n printf("age : %d\\\\n", s2.age);
\n printf("sex : %s\\\\n", s2.sex);
\n printf("id : %s\\\\n", s2.id);<\/p>\n
return 0;
\n}<\/p>\n
\u8fd0\u884c\u5982\u4e0b：<\/p>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121712-6a6c92487aa66.png\")
<\/p>\n
\u8865\u5145\u5176\u4ed6\u521d\u59cb\u5316\u65b9\u5f0f<\/p>\n
\/\/ \u65b9\u5f0f3：\u5148\u521b\u5efa，\u540e\u9010\u4e2a\u8d4b\u503c
\nstruct Stu s3;
\nstrcpy(s3.name, "hf");
\ns3.age = 22;
\nstrcpy(s3.sex, "\u7537");
\nstrcpy(s3.id, "20260818003");<\/p>\n
\/\/ \u65b9\u5f0f4：\u4f7f\u7528typedef\u7b80\u5316（\u63a8\u8350）
\ntypedef struct Stu Stu; \/\/ \u6216\u76f4\u63a5\u5728\u58f0\u660e\u65f6\u52a0 typedef
\nStu s4 = { "hf", 23, "\u7537", "20260818004" };<\/p>\n
\n
4.\u533f\u540d\u7ed3\u6784\u4f53（\u4e0d\u5b8c\u5168\u58f0\u660e）<\/h3>\n
\/\/ \u533f\u540d\u7ed3\u6784\u4f53\u7c7b\u578b（\u6ca1\u6709\u6807\u7b7e\u540d tag）
\nstruct
\n{
\n int a;
\n char b;
\n float c;
\n} x; \/\/ \u76f4\u63a5\u521b\u5efa\u53d8\u91cf x<\/p>\n
struct
\n{
\n int a;
\n char b;
\n float c;
\n} a[20], *p; \/\/ \u521b\u5efa\u6570\u7ec4 a[20] \u548c\u6307\u9488 p<\/p>\n
\u4e0a\u2faf\u7684\u4e24\u4e2a\u7ed3\u6784\u5728\u58f0\u660e\u7684\u65f6\u5019\u7701\u7565\u6389\u4e86\u7ed3\u6784\u4f53\u6807\u7b7e（tag）\u3002
\n\u90a3\u4e48\u95ee\u9898\u6765\u4e86？
\n\u00a0<\/p>\n
\/\/\u5728\u4e0a\u2faf\u4ee3\u7801\u7684\u57fa\u7840\u4e0a，\u4e0b\u2faf\u7684\u4ee3\u7801\u5408\u6cd5\u5417？
\np = &x;<\/p>\n
\u8fd9\u91cc\u56e0\u4e3a\u4f1a\u88ab\u8ba4\u4e3a\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u7c7b\u578b，\u6240\u4ee5 *p\u00a0\u4e0d\u80fd\u5b58\u53d8\u91cf x\u00a0\u7684\u5730\u5740\u3002<\/span><\/span><\/p>\n \u8b66\u544a：<\/span><\/p>\n \u6539\u8fdb\u65b9\u6cd5（\u4f7f\u7528 typedef \u89e3\u51b3）<\/p>\n \/\/ \u5982\u679c\u60f3\u8ba9\u533f\u540d\u7ed3\u6784\u4f53\u53ef\u590d\u7528，\u53ef\u4ee5\u7528typedef MyStruct s1 = { 1, 'a', 3.14 }; \u7ed3\u6784\u4f53\u5141\u8bb8\u5305\u542b\u4e00\u4e2a\u6307\u5411\u540c\u7c7b\u578b\u7ed3\u6784\u4f53\u7684\u6307\u9488\u4f5c\u4e3a\u6210\u5458（\u5373\u81ea\u5f15\u7528\u6307\u9488），\u4f46\u4e0d\u5141\u8bb8\u5305\u542b\u540c\u7c7b\u578b\u7ed3\u6784\u4f53\u7684\u5b8c\u6574\u53d8\u91cf\u4f5c\u4e3a\u6210\u5458\u3002<\/p>\n \u5728\u7ed3\u6784\u4e2d\u5305\u542b\u2f00\u4e2a\u7c7b\u578b\u4e3a\u8be5\u7ed3\u6784\u672c\u2f9d\u7684\u6210\u5458\u662f\u5426\u53ef\u4ee5\u5462？<\/span><\/p>\n \u2f50\u5982，\u5b9a\u4e49\u2f00\u4e2a\u94fe\u8868\u7684\u8282\u70b9： \u4e0a\u8ff0\u4ee3\u7801\u6b63\u786e\u5417？\u5982\u679c\u6b63\u786e，\u90a3 sizeof(struct Node) \u662f\u591a\u5c11？\u6211\u4eec\u8fd0\u884c\u4e00\u4e0b\u770b\u4e00\u4e0b<\/p>\n \u7ed3\u6784\u4f53\u4e0d\u80fd\u5305\u542b\u81ea\u8eab\u7c7b\u578b\u7684\u5b8c\u6574\u5bf9\u8c61<\/p>\n<\/li>\n \u7f16\u8bd1\u5668\u65e0\u6cd5\u8ba1\u7b97\u00a0sizeof(struct Node)（\u65e0\u9650\u9012\u5f52）<\/p>\n<\/li>\n \u4f1a\u62a5\u9519：C2079: "next" \u4f7f\u7528\u672a\u5b9a\u4e49\u7684 struct "Node"<\/p>\n<\/li>\n \u6240\u4ee5，\u4ed4\u7ec6\u5206\u6790，\u5176\u5b9e\u662f\u4e0d\u2f8f\u7684，\u56e0\u4e3a\u2f00\u4e2a\u7ed3\u6784\u4f53\u4e2d\u518d\u5305\u542b\u2f00\u4e2a\u540c\u7c7b\u578b\u7684\u7ed3\u6784\u4f53\u53d8\u91cf，\u8fd9\u6837\u7ed3\u6784\u4f53\u53d8\u91cf\u7684\u2f24\u2f29\u5c31\u4f1a\u2f46\u7a77\u7684\u2f24，\u662f\u4e0d\u5408\u7406\u7684\u3002<\/p>\n \u6b63\u786e\u7684\u2f83\u5f15\u2f64\u2f45\u5f0f：<\/p>\n \u4ee3\u7801： \u5728\u7ed3\u6784\u4f53\u2f83\u5f15\u2f64\u4f7f\u2f64\u7684\u8fc7\u7a0b\u4e2d，\u5939\u6742\u4e86 typedef \u5bf9\u533f\u540d\u7ed3\u6784\u4f53\u7c7b\u578b\u91cd\u547d\u540d，\u4e5f\u5bb9\u6613\u5f15\u2f0a\u95ee\u9898，\u770b\u770b\u4e0b\u2faf\u7684\u4ee3\u7801，\u53ef\u2f8f\u5417？<\/p>\n typedef struct \u7b54\u6848\u662f\u4e0d\u2f8f\u7684，\u56e0\u4e3aNode\u662f\u5bf9\u524d\u2faf\u7684\u533f\u540d\u7ed3\u6784\u4f53\u7c7b\u578b\u7684\u91cd\u547d\u540d\u4ea7\u2f63\u7684，\u4f46\u662f\u5728\u533f\u540d\u7ed3\u6784\u4f53\u5185\u90e8\u63d0\u524d\u4f7f\u2f64Node\u7c7b\u578b\u6765\u521b\u5efa\u6210\u5458\u53d8\u91cf，\u8fd9\u662f\u4e0d\u2f8f\u7684\u3002<\/span><\/p>\n \u89e3\u51b3\u2f45\u6848\u5982\u4e0b：\u5b9a\u4e49\u7ed3\u6784\u4f53\u4e0d\u8981\u4f7f\u2f64\u533f\u540d\u7ed3\u6784\u4f53\u4e86<\/p>\n typedef struct Node \u5728\u7ed3\u6784\u4f53\u5b9a\u4e49\u4e2d\u4f7f\u7528 struct Node \u6765\u6307\u660e next \u6307\u9488\u7684\u7c7b\u578b，\u800c\u4e0d\u662f\u76f4\u63a5\u4f7f\u7528 Node\u3002\u8fd9\u6837\u7f16\u8bd1\u5668\u5c31\u80fd\u6b63\u786e\u8bc6\u522b Node \u7c7b\u578b\u4e86<\/p>\n \u6211\u4eec\u5df2\u7ecf\u638c\u63e1\u4e86\u7ed3\u6784\u4f53\u7684\u57fa\u672c\u4f7f\u2f64\u4e86\u3002\u73b0\u5728\u6211\u4eec\u6df1\u2f0a\u8ba8\u8bba\u2f00\u4e2a\u95ee\u9898：\u8ba1\u7b97\u7ed3\u6784\u4f53\u7684\u2f24\u2f29\u3002 \u2fb8\u5148\u5f97\u638c\u63e1\u7ed3\u6784\u4f53\u7684\u5bf9\u2eec\u89c4\u5219：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 – VS \u4e2d\u9ed8\u8ba4\u7684\u503c\u4e3a 8<\/span><\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 – Linux\u4e2d gcc \u6ca1\u6709\u9ed8\u8ba4\u5bf9\u2eec\u6570，\u5bf9\u2eec\u6570\u5c31\u662f\u6210\u5458\u2f83\u2f9d\u7684\u2f24\u2f29<\/span><\/p>\n \u7ec3\u4e60\u5982\u4e0b：<\/p>\n struct S1 \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n<\/p>\n c1\u00a0\u662f\u7b2c\u4e00\u4e2a\u6210\u5458，\u4ece\u5730\u57400\u5f00\u59cb\u653e，\u53601\u4e2a\u5b57\u8282\u3002<\/p>\n \u63a5\u4e0b\u6765\u653e\u00a0i，int\u00a0\u7684\u5bf9\u9f50\u6570\u662f4，\u6240\u4ee5\u5b83\u7684\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f4\u7684\u500d\u6570\u3002\u73b0\u5728\u5730\u5740\u53ea\u52300，\u4e0b\u4e00\u4e2a\u662f1，\u4e0d\u662f4\u7684\u500d\u6570，\u6240\u4ee5\u00a01\u30012\u30013\u8fd9\u4e09\u4e2a\u5730\u5740\u90fd\u88ab\u6d6a\u8d39\u6389\u4e86<\/span>，\u4ece\u5730\u57404\u5f00\u59cb\u653e\u00a0i，\u53604\u4e2a\u5b57\u8282\u3002\u7136\u540e\u653e\u00a0c2，char\u00a0\u7684\u5bf9\u9f50\u6570\u662f1，\u968f\u4fbf\u653e，\u6240\u4ee5\u76f4\u63a5\u653e\u5728\u5730\u57408，\u53601\u4e2a\u5b57\u8282\u3002<\/p>\n \u73b0\u5728\u7ed3\u6784\u4f53\u5df2\u7ecf\u5360\u4e86\u5730\u57400\u52308，\u4e00\u51719\u4e2a\u5b57\u8282\u4e86\u3002\u4f46\u662f\u89c4\u5219\u8981\u6c42\u7ed3\u6784\u4f53\u603b\u5927\u5c0f\u5fc5\u987b\u662f\u6700\u5927\u5bf9\u9f50\u6570（\u8fd9\u91cc\u662f4）\u7684\u500d\u6570，9\u4e0d\u662f4\u7684\u500d\u6570，\u6240\u4ee5\u8981\u518d\u88653\u4e2a\u5b57\u8282，<\/span>\u53d8\u621012\u3002<\/p>\n \u6240\u4ee5\u6700\u540e\u5c31\u662f12\u3002<\/p>\n struct S2 \u8fd0\u884c\u5982\u4e0b：<\/p>\n \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n c1\u00a0\u662f\u7b2c\u4e00\u4e2a\u6210\u5458，\u4ece\u5730\u57400\u5f00\u59cb\u653e，\u53601\u4e2a\u5b57\u8282\u3002<\/p>\n \u63a5\u4e0b\u6765\u662f\u00a0c2，\u5b83\u662f\u00a0char\u00a0\u7c7b\u578b，\u5bf9\u9f50\u6570\u662f1，\u6240\u4ee5\u5b83\u53ef\u4ee5\u6328\u7740\u653e，\u76f4\u63a5\u653e\u5728\u5730\u57401，\u4e0d\u7528\u6d6a\u8d39\u7a7a\u95f4；<\/p>\n \u7136\u540e\u5230\u00a0i\u00a0\u4e86，int\u00a0\u7684\u5bf9\u9f50\u6570\u662f4，\u6240\u4ee5\u5b83\u7684\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f4\u7684\u500d\u6570\u3002\u73b0\u5728\u5730\u5740\u52301\u4e86，\u4e0b\u4e00\u4e2a\u662f2，\u4e0d\u884c，3\u4e5f\u4e0d\u884c，\u5fc5\u987b\u52304\u624d\u53ef\u4ee5，\u6240\u4ee5\u5730\u57402\u548c3\u88ab\u6d6a\u8d39\u6389\u4e86<\/span>，\u4ece\u5730\u57404\u5f00\u59cb\u653e\u00a0i，\u53604\u4e2a\u5b57\u8282；<\/p>\n \u8fd9\u65f6\u5019\u7ed3\u6784\u4f53\u5df2\u7ecf\u5360\u4e86\u5730\u57400\u52307，\u4e00\u51718\u4e2a\u5b57\u8282\u3002\u6240\u6709\u6210\u5458\u91cc\u6700\u5927\u5bf9\u9f50\u6570\u662f4，8\u521a\u597d\u662f4\u7684\u500d\u6570，\u4e0d\u9700\u8981\u518d\u8865\u4f4d\u4e86\u3002<\/p>\n \u6240\u4ee5\u6700\u540e\u5c31\u662f\u00a08\u4e2a\u5b57\u8282<\/span><\/p>\n struct S3 \u8fd0\u884c\u5982\u4e0b：<\/p>\n \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n d\u00a0\u662f\u7b2c\u4e00\u4e2a\u6210\u5458，\u4ece\u5730\u57400\u5f00\u59cb\u653e，double\u00a0\u662f8\u4e2a\u5b57\u8282，\u6240\u4ee5\u5360\u5730\u57400\u52307\u3002<\/p>\n \u63a5\u4e0b\u6765\u662f\u00a0c，char\u00a0\u7c7b\u578b，\u5bf9\u9f50\u6570\u662f1，\u53ef\u4ee5\u76f4\u63a5\u6328\u7740\u653e，\u653e\u5728\u5730\u57408，\u53601\u4e2a\u5b57\u8282；<\/p>\n \u7136\u540e\u5230\u00a0i\u00a0\u4e86，int\u00a0\u7684\u5bf9\u9f50\u6570\u662f4，\u6240\u4ee5\u5b83\u7684\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f4\u7684\u500d\u6570\u3002\u73b0\u5728\u5730\u5740\u52308\u4e86，\u4e0b\u4e00\u4e2a\u662f9，9\u4e0d\u662f4\u7684\u500d\u6570，\u5730\u57409\u300110\u300111\u88ab\u6d6a\u8d39\u6389\u4e86<\/span>，\u4ece\u5730\u574012\u5f00\u59cb\u653e\u00a0i，\u53604\u4e2a\u5b57\u8282，\u5230\u5730\u574015\u7ed3\u675f；<\/p>\n \u8fd9\u65f6\u5019\u7ed3\u6784\u4f53\u5df2\u7ecf\u5360\u4e86\u5730\u57400\u523015，\u4e00\u517116\u4e2a\u5b57\u8282\u3002\u6240\u6709\u6210\u5458\u91cc\u6700\u5927\u5bf9\u9f50\u6570\u662f\u00a0double\u00a0\u76848，16\u521a\u597d\u662f8\u7684\u500d\u6570，\u4e0d\u9700\u8981\u518d\u8865\u4f4d\u3002<\/p>\n \u6240\u4ee5\u6700\u540e\u5c31\u662f\u00a016\u4e2a\u5b57\u8282\u3002<\/span><\/p>\n \/\/\u7ec3\u4e604-\u7ed3\u6784\u4f53\u5d4c\u5957\u95ee\u9898 \u7ec3\u4e604，\u770b\u51fa\u8fd9\u4e2a\u5d4c\u5957\u7ed3\u6784\u4f53，\u90a3\u53c8\u600e\u4e48\u7b97？<\/p>\n \u5176\u5b9e\u8fd8\u662f\u6309\u4e4b\u524d\u7684\u89c4\u5219\u6765，\u53ea\u662f\u591a\u4e86\u4e00\u6761：\u88ab\u5d4c\u5957\u7684\u7ed3\u6784\u4f53，\u5b83\u7684\u5bf9\u9f50\u6570\u7b49\u4e8e\u5b83\u5185\u90e8\u6240\u6709\u6210\u5458\u4e2d\u6700\u5927\u7684\u90a3\u4e2a\u5bf9\u9f50\u6570\u3002<\/span><\/p>\n \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n c1\u00a0\u662f\u7b2c\u4e00\u4e2a\u6210\u5458，\u4ece\u5730\u57400\u5f00\u59cb\u653e，\u53601\u4e2a\u5b57\u8282；<\/p>\n \u63a5\u4e0b\u6765\u653e\u00a0s3，struct S3\u00a0\u7684\u5bf9\u9f50\u6570\u662f8（\u56e0\u4e3a\u5b83\u91cc\u9762\u6709\u4e2a\u00a0double），\u6240\u4ee5\u5b83\u7684\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f8\u7684\u500d\u6570\u3002\u73b0\u5728\u5730\u5740\u52300\u4e86，\u4e0b\u4e00\u4e2a\u662f1，\u4e0d\u884c，2\u30013\u30014\u30015\u30016\u30017\u90fd\u4e0d\u884c，\u5fc5\u987b\u52308\u624d\u53ef\u4ee5，\u6240\u4ee5\u5730\u57401\u52307\u5168\u88ab\u6d6a\u8d39\u4e86，\u4ece\u5730\u57408\u5f00\u59cb\u653e\u00a0s3，s3\u00a0\u81ea\u5df1\u5185\u90e8\u536016\u4e2a\u5b57\u8282，\u6240\u4ee5\u5b83\u5360\u5730\u57408\u523023；<\/p>\n \u7136\u540e\u653e\u00a0d，double\u00a0\u7684\u5bf9\u9f50\u6570\u662f8，\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f8\u7684\u500d\u6570\u3002\u73b0\u5728\u5730\u5740\u523023\u4e86，\u4e0b\u4e00\u4e2a\u662f24，24\u662f8\u7684\u500d\u6570（8\u00d73=24），\u6240\u4ee5\u76f4\u63a5\u653e，\u5360\u5730\u574024\u523031；<\/p>\n \u73b0\u5728\u6574\u4e2a\u7ed3\u6784\u4f53\u5360\u4e86\u5730\u57400\u523031，\u4e00\u517132\u4e2a\u5b57\u8282\u3002\u6240\u6709\u6210\u5458\u91cc\u6700\u5927\u5bf9\u9f50\u6570\u662f8（s3\u00a0\u548c\u00a0d\u00a0\u90fd\u662f8），32\u521a\u597d\u662f8\u7684\u500d\u6570，\u4e0d\u9700\u8981\u518d\u8865\u4f4d\u3002<\/p>\n \u6240\u4ee5\u6700\u540e\u00a0sizeof(struct S4)\u00a0\u662f\u00a032\u4e2a\u5b57\u8282\u3002<\/p>\n \u4e0d\u662f\u6240\u6709\u7684\u786c\u4ef6\u5e73\u53f0\u90fd\u80fd\u8bbf\u95ee\u4efb\u610f\u5730\u5740\u4e0a\u7684\u4efb\u610f\u6570\u636e\u7684；\u67d0\u4e9b\u786c\u4ef6\u5e73\u53f0\u53ea\u80fd\u5728\u67d0\u4e9b\u5730\u5740\u5904\u53d6\u67d0\u4e9b\u7279\u5b9a\u7c7b\u578b\u7684\u6570\u636e，\u5426\u5219\u629b\u51fa\u786c\u4ef6\u5f02\u5e38\u3002<\/p>\n<\/p>\n \u6570\u636e\u7ed3\u6784(\u5c24\u5176\u662f\u6808)\u5e94\u8be5\u5c3d\u53ef\u80fd\u5730\u5728\u2f83\u7136\u8fb9\u754c\u4e0a\u5bf9\u2eec\u3002\u539f\u56e0\u5728\u4e8e，\u4e3a\u4e86\u8bbf\u95ee\u672a\u5bf9\u2eec\u7684\u5185\u5b58，\u5904\u7406\u5668\u9700\u8981\u4f5c\u4e24\u6b21\u5185\u5b58\u8bbf\u95ee；\u2f7d\u5bf9\u2eec\u7684\u5185\u5b58\u8bbf\u95ee\u4ec5\u9700\u8981\u2f00\u6b21\u8bbf\u95ee\u3002\u5047\u8bbe\u2f00\u4e2a\u5904\u7406\u5668\u603b\u662f\u4ece\u5185\u5b58\u4e2d\u53d68\u4e2a\u5b57\u8282，\u5219\u5730\u5740\u5fc5\u987b\u662f8\u7684\u500d\u6570\u3002\u5982\u679c\u6211\u4eec\u80fd\u4fdd\u8bc1\u5c06\u6240\u6709\u7684double\u7c7b\u578b\u7684\u6570\u636e\u7684\u5730\u5740\u90fd\u5bf9\u2eec\u62108\u7684\u500d\u6570，\u90a3\u4e48\u5c31\u53ef\u4ee5\u2f64\u2f00\u4e2a\u5185\u5b58\u64cd\u4f5c\u6765\u8bfb\u6216\u8005\u5199\u503c\u4e86\u3002\u5426\u5219，\u6211\u4eec\u53ef\u80fd\u9700\u8981\u6267\u2f8f\u4e24\u6b21\u5185\u5b58\u8bbf\u95ee，\u56e0\u4e3a\u5bf9\u8c61\u53ef\u80fd\u88ab\u5206\u653e\u5728\u4e24\u4e2a8\u5b57\u8282\u5185\u5b58\u5757\u4e2d\u3002 \u90a3\u5728\u8bbe\u8ba1\u7ed3\u6784\u4f53\u7684\u65f6\u5019，\u6211\u4eec\u65e2\u8981\u6ee1\u2f9c\u5bf9\u2eec，\u2f1c\u8981\u8282\u7701\u7a7a\u95f4，\u5982\u4f55\u505a\u5230：\u8ba9\u5360\u2f64\u7a7a\u95f4\u2f29\u7684\u6210\u5458\u5c3d\u91cf\u96c6\u4e2d\u5728\u2f00\u8d77<\/span><\/p>\n \u4ee3\u7801\u5982\u4e0b：<\/p>\n struct S1 struct S2 S1 \u548c S2 \u7c7b\u578b\u7684\u6210\u5458\u2f00\u6a21\u2f00\u6837，\u4f46\u662f S1 \u548c S2 \u6240\u5360\u7a7a\u95f4\u7684\u2f24\u2f29\u6709\u4e86\u2f00\u4e9b\u533a\u522b\u3002<\/p>\n #pragma \u8fd9\u4e2a\u9884\u5904\u7406\u6307\u4ee4，\u53ef\u4ee5\u6539\u53d8\u7f16\u8bd1\u5668\u7684\u9ed8\u8ba4\u5bf9\u2eec\u6570\u3002<\/p>\n \u6ca1\u5199pack：\u7f16\u8bd1\u5668\u4f1a\u5728\u6210\u5458\u4e4b\u95f4\u63d2\u7a7a，\u4fdd\u8bc1\u6bcf\u4e2a\u6210\u5458\u90fd\u653e\u5728\u5b83\u5bf9\u9f50\u6570\u7684\u6574\u6570\u500d\u5730\u5740\u4e0a，\u8bbf\u95ee\u66f4\u5feb，\u4f46\u6d6a\u8d39\u5185\u5b58\u3002<\/p>\n<\/li>\n \u5199\u4e86pack(1)：\u5f3a\u52361\u5b57\u8282\u5bf9\u9f50，\u6240\u6709\u6210\u5458\u7d27\u6328\u7740\u653e，\u4e2d\u95f4\u4e0d\u63d2\u7a7a，\u7701\u5185\u5b58，\u4f46\u8bbf\u95ee\u901f\u5ea6\u4f1a\u6162\u4e00\u70b9\u3002<\/p>\n<\/li>\n<\/ul>\n \u6839\u636e\u4ee5\u4e0a\u7ed3\u679c\u53ef\u4ee5\u8bf4\u660e：#pragma\u53ef\u4ee5\u6539\u53d8\u7f16\u8bd1\u5668\u7684\u9ed8\u8ba4\u5bf9\u2eec\u6570\u3002\u6240\u4ee5，\u7ed3\u6784\u4f53\u5728\u5bf9\u2eec\u2f45\u5f0f\u4e0d\u5408\u9002\u7684\u65f6\u5019，\u6211\u4eec\u53ef\u4ee5\u2f83\u2f30\u66f4\u6539\u9ed8\u8ba4\u5bf9\u2eec\u6570\u3002<\/p>\n \u95ee\u9898\u8865\u5145：<\/p>\n \u4e0d\u5199\u7b2c\u4e8c\u4e2a\u884c\u4e0d\u884c？\u540e\u6765\u624d\u77e5\u9053，\u7b2c\u4e8c\u4e2a\u662f\u5fc5\u987b\u5199\u7684，\u56e0\u4e3a：<\/p>\n #pragma pack(1)\u00a0\u4f1a\u5f71\u54cd\u5b83\u540e\u9762\u6240\u6709\u7684\u7ed3\u6784\u4f53\u5b9a\u4e49，\u76f4\u5230\u9047\u5230\u00a0#pragma pack()\u00a0\u624d\u4f1a\u6062\u590d\u3002<\/p>\n \u5982\u679c\u4e0d\u6062\u590d，\u540e\u9762\u5176\u4ed6\u7ed3\u6784\u4f53\u4e5f\u4f1a\u63091\u5b57\u8282\u5bf9\u9f50，\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d（\u6216\u8005\u8ddf\u5176\u4ed6\u4ee3\u7801\u4e0d\u517c\u5bb9）\u3002\u6240\u4ee5\u6807\u51c6\u7684\u5199\u6cd5\u5c31\u662f：\u7528\u5b8c\u4e4b\u540e\u9a6c\u4e0a\u6062\u590d，\u907f\u514d\u5f71\u54cd\u5176\u4ed6\u4ee3\u7801<\/p>\n \u4ee3\u7801\u5982\u4e0b：<\/p>\n struct S struct S s = {{1,2,3,4}, 1000};<\/p>\n \/\/ \u65b9\u5f0f1：\u4f20\u7ed3\u6784\u4f53\u672c\u8eab（\u503c\u4f20\u9012） \/\/ \u65b9\u5f0f2：\u4f20\u7ed3\u6784\u4f53\u6307\u9488（\u5730\u5740\u4f20\u9012） int main() \u90a3\u54ea\u4e2a\u66f4\u597d？\u9996\u9009\u00a0print2（\u4f20\u5730\u5740）\u3002<\/span><\/p>\n \u539f\u56e0\u5982\u4e0b：<\/p>\n \u5728\u7a7a\u95f4\u5f00\u9500\u65b9\u9762：print1\u00a0\u4f20\u7ed3\u6784\u4f53\u7684\u65f6\u5019，\u4f1a\u628a\u6574\u4e2a\u7ed3\u6784\u4f53\u62f7\u8d1d\u4e00\u4efd\u538b\u5230\u6808\u4e0a\u3002\u8fd9\u4e2a\u7ed3\u6784\u4f53\u91cc\u6709\u00a0int data[1000]（4000\u5b57\u8282）+\u00a0int num（4\u5b57\u8282），\u4e00\u51714004\u5b57\u8282，\u6bcf\u6b21\u8c03\u7528\u90fd\u8981\u62f7\u8d1d\u8fd9\u4e48\u591a\u6570\u636e，\u592a\u6d6a\u8d39\u4e86\u3002print2\u00a0\u53ea\u4f20\u4e00\u4e2a\u6307\u9488，8\u5b57\u8282（64\u4f4d\u7cfb\u7edf）\u62164\u5b57\u8282（32\u4f4d\u7cfb\u7edf），\u7701\u5f88\u591a\u3002<\/p>\n \u5728\u65f6\u95f4\u5f00\u9500\u65b9\u9762：\u62f7\u8d1d4004\u5b57\u8282\u6bd4\u62f7\u8d1d8\u5b57\u8282\u6162\u5f97\u591a，\u5c24\u5176\u662f\u7ed3\u6784\u4f53\u5f88\u5927\u7684\u65f6\u5019，\u6027\u80fd\u5dee\u8ddd\u5f88\u660e\u663e\u3002<\/p>\n \u5728\u538b\u6808\u5f00\u9500\u65b9\u9762：\u51fd\u6570\u4f20\u53c2\u662f\u8981\u538b\u6808\u7684，\u6570\u636e\u8d8a\u5927，\u538b\u6808\u6d88\u8017\u7684\u65f6\u95f4\u548c\u7a7a\u95f4\u5c31\u8d8a\u5927\u3002<\/p>\n \u7ed3\u8bba<\/span><\/p>\n \u7ed3\u6784\u4f53\u4f20\u53c2\u7684\u65f6\u5019，\u5c3d\u91cf\u4f20\u7ed3\u6784\u4f53\u7684\u5730\u5740（\u6307\u9488），\u800c\u4e0d\u662f\u4f20\u7ed3\u6784\u4f53\u672c\u8eab\u3002<\/span><\/span>\u9664\u975e\u7ed3\u6784\u4f53\u7279\u522b\u5c0f（\u6bd4\u5982\u5c31\u4e00\u4e24\u4e2aint），\u90a3\u4f20\u503c\u548c\u4f20\u6307\u9488\u5dee\u522b\u4e0d\u5927，\u600e\u4e48\u5199\u90fd\u884c\u3002\u4f46\u5927\u591a\u6570\u60c5\u51b5\u4e0b，\u4f20\u6307\u9488\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n \u4f4d\u6bb5\u7684\u58f0\u660e\u548c\u7ed3\u6784\u662f\u7c7b\u4f3c\u7684，\u6709\u4e24\u4e2a\u4e0d\u540c：<\/p>\n \u793a\u4f8b\u5982\u4e0b：<\/p>\n struct A A\u5c31\u662f\u2f00\u4e2a\u4f4d\u6bb5\u7c7b\u578b\u3002\u90a3\u4f4d\u6bb5A\u6240\u5360\u5185\u5b58\u7684\u2f24\u2f29\u662f\u591a\u5c11<\/p>\n \u6210\u5458\u662f\u00a0int，\u6240\u4ee5\u4e00\u6b21\u5f004\u4e2a\u5b57\u8282（32\u4e2abit）\u3002<\/p>\n _a\u00a0\u53602\u4e2abit，\u5b58\u8fdb\u53bb，\u8fd8\u526930\u4e2abit\u3002<\/p>\n _b\u00a0\u53605\u4e2abit，\u5b58\u8fdb\u53bb，\u8fd8\u526925\u4e2abit\u3002<\/p>\n _c\u00a0\u536010\u4e2abit，\u5b58\u8fdb\u53bb，\u8fd8\u526915\u4e2abit\u3002<\/p>\n \u8f6e\u5230\u00a0_d\u00a0\u4e86，\u5b83\u9700\u898130\u4e2abit，\u4f46\u5f53\u524d\u5269\u4e0b\u7684\u53ea\u670915\u4e2abit，\u4e0d\u591f\u4e86，\u6240\u4ee5\u5269\u4e0b\u768415\u4e2abit\u76f4\u63a5\u6d6a\u8d39\u6389，\u518d\u91cd\u65b0\u5f004\u4e2a\u5b57\u8282（32\u4e2abit）\u6765\u5b58\u00a0_d\u3002<\/p>\n _d\u00a0\u536030\u4e2abit，\u653e\u5230\u65b0\u5f00\u7684\u8fd9\u4e2a4\u5b57\u8282\u91cc\u3002<\/p>\n \u56db\u4e2a\u6210\u5458\u536047\u4e2a\u6bd4\u7279\u4f4d，\u800c8\u4e2a\u5b57\u8282\u662f64\u4e2a\u6bd4\u7279\u4f4d，\u6240\u4ee5\u4e00\u5171\u7528\u4e86\u00a0\u4e24\u4e2a4\u5b57\u8282\u00a0=\u00a08\u4e2a\u5b57\u8282\u3002<\/p>\n \u793a\u4f8b\u5982\u4e0b：<\/p>\n struct S \u7a7a\u95f4\u662f\u5982\u4f55\u5f00\u8f9f\u7684？<\/p>\n \u603b\u7ed3：<\/p>\n \u8ddf\u7ed3\u6784\u76f8\u2f50，\u4f4d\u6bb5\u53ef\u4ee5\u8fbe\u5230\u540c\u6837\u7684\u6548\u679c，\u5e76\u4e14\u53ef\u4ee5\u5f88\u597d\u7684\u8282\u7701\u7a7a\u95f4，\u4f46\u662f\u6709\u8de8\u5e73\u53f0\u7684\u95ee\u9898\u5b58\u5728\u3002<\/span><\/span><\/p>\n \u4e0b\u56fe\u662f\u2f79\u7edc\u534f\u8bae\u4e2d，IP\u6570\u636e\u62a5\u7684\u683c\u5f0f，\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5176\u4e2d\u5f88\u591a\u7684\u5c5e\u6027\u53ea\u9700\u8981\u2f0f\u4e2abit\u4f4d\u5c31\u80fd\u63cf\u8ff0，\u8fd9\u2fa5\u4f7f\u2f64\u4f4d\u6bb5，\u80fd\u591f\u5b9e\u73b0\u60f3\u8981\u7684\u6548\u679c，\u4e5f\u8282\u7701\u4e86\u7a7a\u95f4，\u8fd9\u6837\u2f79\u7edc\u4f20\u8f93\u7684\u6570\u636e\u62a5\u2f24\u2f29\u4e5f\u4f1a\u8f83\u2f29\u2f00\u4e9b，\u5bf9\u2f79\u7edc\u7684\u7545\u901a\u662f\u6709\u5e2e\u52a9\u7684\u3002<\/p>\n \u4f4d\u6bb5\u7684\u2f0f\u4e2a\u6210\u5458\u5171\u6709\u540c\u2f00\u4e2a\u5b57\u8282，\u8fd9\u6837\u6709\u4e9b\u6210\u5458\u7684\u8d77\u59cb\u4f4d\u7f6e\u5e76\u4e0d\u662f\u67d0\u4e2a\u5b57\u8282\u7684\u8d77\u59cb\u4f4d\u7f6e，\u90a3\u4e48\u8fd9\u4e9b\u4f4d\u7f6e\u5904\u662f\u6ca1\u6709\u5730\u5740\u7684\u3002\u5185\u5b58\u4e2d\u6bcf\u4e2a\u5b57\u8282\u5206\u914d\u2f00\u4e2a\u5730\u5740，\u2f00\u4e2a\u5b57\u8282\u5185\u90e8\u7684bit\u4f4d\u662f\u6ca1\u6709\u5730\u5740\u7684\u3002<\/p>\n \n\u6240\u4ee5\u4e0d\u80fd\u5bf9\u4f4d\u6bb5\u7684\u6210\u5458\u4f7f\u2f64&\u64cd\u4f5c\u7b26，\u8fd9\u6837\u5c31\u4e0d\u80fd\u4f7f\u2f64scanf\u76f4\u63a5\u7ed9\u4f4d\u6bb5\u7684\u6210\u5458\u8f93\u2f0a\u503c，\u53ea\u80fd\u662f\u5148\u8f93\u2f0a\u653e\u5728\u2f00\u4e2a\u53d8\u91cf\u4e2d，\u7136\u540e\u8d4b\u503c\u7ed9\u4f4d\u6bb5\u7684\u6210\u5458\u3002<\/p>\n \u4ee3\u7801\u5982\u4e0b：<\/p>\n #include<stdio.h> \u50cf\u7ed3\u6784\u4f53\u2f00\u6837，\u8054\u5408\u4f53\u4e5f\u662f\u7531\u2f00\u4e2a\u6216\u8005\u591a\u4e2a\u6210\u5458\u6784\u6210，\u8fd9\u4e9b\u6210\u5458\u53ef\u4ee5\u4e0d\u540c\u7684\u7c7b\u578b\u3002 \u7ed9\u8054\u5408\u4f53\u5176\u4e2d\u2f00\u4e2a\u6210\u5458\u8d4b\u503c，\u5176\u4ed6\u6210\u5458\u7684\u503c\u4e5f\u8ddf\u7740\u53d8\u5316\u3002<\/p>\n \u4ee3\u7801\u5982\u4e0b：<\/p>\n #include <stdio.h> #include <stdio.h><\/p>\n union Un int main() return 0; \u4e3a\u4ec0\u4e48\u662f 4 \u4e2a\u5b57\u8282\u5462？<\/p>\n \u8fd9i\u548cc\u7684\u8d77\u70b9\u90fd\u662f\u4e00\u6837\u7684，\u5bf9\u5e94\u8fd9\u4e2a\u7ea2\u8272\u7684\u90e8\u5206<\/p>\n \u770b\u4e0a\u9762\u8f93\u51fa\u7684\u7ed3\u679c，\u4ed6\u4eec\u7684\u5185\u5b58\u5730\u5740\u4e5f\u90fd\u662f\u4e00\u6837\u7684\u3002<\/p>\n \u7ed3\u8bba：\u8054\u5408\u4f53\u7684\u6210\u5458\u662f\u5171\u7528\u540c\u4e00\u5757\u5185\u5b58\u7a7a\u95f4\u7684，\u56e0\u4e3a\u8054\u5408\u81f3\u5c11\u8981\u6709\u4fdd\u5b58\u6700\u5927\u7684\u90a3\u4e2a\u6210\u5458\u7684\u80fd\u529b，\u6240\u4ee5\u4e00\u4e2a\u8054\u5408\u53d8\u91cf\u7684\u5927\u5c0f\u81f3\u5c11\u662f\u6700\u5927\u6210\u5458\u7684\u5927\u5c0f\u3002\u6ce8\u610f：\u5728\u540c\u4e00\u65f6\u95f4\u5185\u4f60\u53ea\u53ef\u4ee5\u4f7f\u7528\u8054\u5408\u4f53\u4e2d\u7684\u4e00\u4e2a\u6210\u5458\u3002<\/span><\/span><\/p>\n \u6211\u4eec\u518d\u5bf9\u2f50\u2f00\u4e0b\u76f8\u540c\u6210\u5458\u7684\u7ed3\u6784\u4f53\u548c\u8054\u5408\u4f53\u7684\u5185\u5b58\u5e03\u5c40\u60c5\u51b5\u3002<\/p>\n struct S union Un #include <stdio.h> \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n \u627e\u51fa\u6210\u5458\u5927\u5c0f：char[5]=5，int=4 –>\u6700\u5927\u6210\u5458 = 5 \u5b57\u8282；<\/p>\n \u627e\u51fa\u5404\u6210\u5458\u5bf9\u9f50\u6570：1\u30014 –>\u00a0\u6700\u5927\u5bf9\u9f50\u6570 = 4\u3002<\/p>\n \u5224\u65ad：5 \u662f\u4e0d\u662f 4 \u7684\u6574\u6570\u500d？\u5411\u4e0a\u53d6\u6700\u8fd1\u7684 4 \u7684\u500d\u6570：8 \u6240\u4ee5 sizeof(union Un1) = 8<\/p>\n \u6210\u5458\u5927\u5c0f：short[7]=14，int=4\u00a0–>\u00a0\u6700\u5927\u6210\u5458 = 14 \u5b57\u8282;<\/p>\n \u5404\u6210\u5458\u5bf9\u9f50\u6570：2\u30014 –>\u00a0\u6700\u5927\u5bf9\u9f50\u6570 = 4;<\/p>\n \u5224\u65ad：14 \u662f\u4e0d\u662f 4 \u7684\u6574\u6570\u500d？\u5411\u4e0a\u627e\u6700\u8fd1\u7684 4 \u7684\u500d\u6570： 4\u00d73=12（\u5c0f\u4e8e 14，\u4e0d\u884c），4\u00d74=16 \u00a0\u6240\u4ee5 sizeof(union Un2) = 16<\/p>\n \u4f7f\u2f64\u8054\u5408\u4f53\u662f\u53ef\u4ee5\u8282\u7701\u7a7a\u95f4\u7684，\u4e3e\u4f8b：<\/span><\/p>\n \u2f50\u5982，\u6211\u4eec\u8981\u641e\u2f00\u4e2a\u6d3b\u52a8，\u8981\u4e0a\u7ebf\u2f00\u4e2a\u793c\u54c1\u5151\u6362\u5355，\u793c\u54c1\u5151\u6362\u5355\u4e2d\u6709\u4e09\u79cd\u5546\u54c1：\u56fe\u4e66\u3001\u676f\u2f26\u3001\u886c\u886b\u3002 \u4ee3\u7801\u5982\u4e0b：<\/p>\n struct gift_list \u4e0a\u8ff0\u7684\u7ed3\u6784\u5176\u5b9e\u8bbe\u8ba1\u7684\u5f88\u7b80\u5355，\u2f64\u8d77\u6765\u4e5f\u2f45\u4fbf，\u4f46\u662f\u7ed3\u6784\u7684\u8bbe\u8ba1\u4e2d\u5305\u542b\u4e86\u6240\u6709\u793c\u54c1\u7684\u5404\u79cd\u5c5e\u6027，\u8fd9\u6837\u4f7f\u5f97\u7ed3\u6784\u4f53\u7684\u2f24\u2f29\u5c31\u4f1a\u504f\u2f24，\u2f50\u8f83\u6d6a\u8d39\u5185\u5b58\u3002\u56e0\u4e3a\u5bf9\u4e8e\u793c\u54c1\u5151\u6362\u5355\u4e2d\u7684\u5546\u54c1\u6765\u8bf4，\u53ea\u6709\u90e8\u5206\u5c5e\u6027\u4fe1\u606f\u662f\u5e38\u2f64\u7684\u3002\u2f50\u5982： struct gift_list struct struct \u5b9a\u4e49：\u5927\u5c0f\u7aef\u662f\u6570\u636e\u5728\u5185\u5b58\u4e2d\u7684\u5b58\u50a8\u65b9\u5f0f：<\/span><\/p>\n \u5927\u7aef\u6a21\u5f0f：\u6570\u636e\u7684\u9ad8\u4f4d\u5b57\u8282\u4fdd\u5b58\u5728\u4f4e\u5730\u5740，\u4f4e\u4f4d\u5b57\u8282\u4fdd\u5b58\u5728\u9ad8\u5730\u5740（\u8ddf\u6211\u4eec\u5e73\u65f6\u5199\u6570\u5b57\u7684\u4e60\u60ef\u4e00\u6837）<\/p>\n<\/li>\n \u5c0f\u7aef\u6a21\u5f0f：\u6570\u636e\u7684\u4f4e\u4f4d\u5b57\u8282\u4fdd\u5b58\u5728\u4f4e\u5730\u5740，\u9ad8\u4f4d\u5b57\u8282\u4fdd\u5b58\u5728\u9ad8\u5730\u5740<\/p>\n<\/li>\n<\/ul>\n \u4e3e\u4e2a\u4f8b\u5b50，int a = 0x11223344：<\/p>\n \u5199\u2f00\u4e2a\u7a0b\u5e8f，\u5224\u65ad\u5f53\u524d\u673a\u5668\u662f\u2f24\u7aef？\u8fd8\u662f\u2f29\u7aef？<\/p>\n #include <stdio.h><\/p>\n int check_sys() int main() \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n int a = 1，\u5341\u516d\u8fdb\u5236\u662f\u00a00x00 00 00 01<\/p>\n \u5f3a\u8f6c\u6210\u00a0char*\u00a0\u540e，\u6307\u5411\u7684\u662f\u7b2c\u4e00\u4e2a\u5b57\u8282（\u4f4e\u5730\u5740）<\/p>\n \u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f\u00a001\u00a0–>\u5c0f\u7aef<\/p>\n \u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f\u00a000\u00a0–>\u00a0\u5927\u7aef<\/p>\n #include <stdio.h><\/p>\n int check_sys() u.i = 1; \/\/ \u5b58\u6574\u6570 1 int main() \u8fc7\u7a0b\u5982\u4e0b：<\/p>\n \u8054\u5408\u4f53\u7684\u6210\u5458i\u548cc\u5171\u7528\u540c\u4e00\u5757\u5185\u5b58<\/p>\n u.i = 1\u00a0\u5199\u51654\u4e2a\u5b57\u8282<\/p>\n u.c\u00a0\u8bfb\u53d6\u7684\u662f\u7b2c\u4e00\u4e2a\u5b57\u8282（\u4f4e\u5730\u5740）<\/p>\n \u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f1\u00a0–>\u00a0\u5c0f\u7aef<\/p>\n \u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f0\u00a0–>\u5927\u7aef<\/p>\n \u679a\u4e3e\u5c31\u662f\u628a\u4e00\u4e2a\u96c6\u5408\u91cc\u6240\u6709\u53ef\u80fd\u7684\u503c\u4e00\u4e00\u5217\u4e3e\u51fa\u6765，\u5728C\u8bed\u8a00\u91cc\u7528\u00a0enum\u00a0\u5173\u952e\u5b57\u5b9a\u4e49，\u679a\u4e3e\u6210\u5458\u672c\u8d28\u4e0a\u662f\u6574\u578b\u5e38\u91cf，\u9ed8\u8ba4\u4ece0\u5f00\u59cb\u4f9d\u6b21\u9012\u589e，\u4e5f\u53ef\u4ee5\u624b\u52a8\u6307\u5b9a\u503c\u3002<\/span><\/p>\n \u679a\u4e3e\u6bd4\u00a0#define\u00a0\u5b8f\u66f4\u597d\u7528，\u56e0\u4e3a\u5b83\u6709\u7c7b\u578b\u68c0\u67e5\u3001\u652f\u6301\u8c03\u8bd5\u3001\u76f8\u5173\u5e38\u91cf\u53ef\u4ee5\u5206\u7ec4\u7ba1\u7406，\u80fd\u8ba9\u4ee3\u7801\u66f4\u53ef\u8bfb\u3001\u66f4\u6613\u7ef4\u62a4\u3002<\/p>\n \u5b9e\u9645\u5f00\u53d1\u4e2d，\u679a\u4e3e\u5e38\u7528\u4e8e\u8868\u793a\u72b6\u6001\u7801\u3001\u9009\u9879\u914d\u7f6e\u3001\u661f\u671f\u6708\u4efd\u8fd9\u7c7b\u53d6\u503c\u56fa\u5b9a\u7684\u573a\u666f，\u7528\u679a\u4e3e\u540d\u4ee3\u66ff\u9b54\u672f\u6570\u5b57，\u4ee3\u7801\u4e00\u770b\u5c31\u61c2，\u6539\u8d77\u6765\u4e5f\u65b9\u4fbf\u3002<\/p>\n enum Color\/\/\u989c\u2f8a \u4ee5\u4e0a\u5b9a\u4e49\u7684 enum Day ， enum Sex ， enum Color \u90fd\u662f\u679a\u4e3e\u7c7b\u578b\u3002{}\u4e2d\u7684\u5185\u5bb9\u662f\u679a\u4e3e\u7c7b\u578b\u7684\u53ef\u80fd\u53d6\u503c，\u4e5f\u53eb \u679a\u4e3e\u5e38\u91cf \u3002<\/p>\n \u8fd9\u4e9b\u53ef\u80fd\u53d6\u503c\u90fd\u662f\u6709\u503c\u7684，\u9ed8\u8ba4\u4ece0\u5f00\u59cb，\u4f9d\u6b21\u9012\u589e1，\u5f53\u7136\u5728\u58f0\u660e\u679a\u4e3e\u7c7b\u578b\u7684\u65f6\u5019\u4e5f\u53ef\u4ee5\u8d4b\u521d\u503c\u3002<\/p>\n enum Color\/\/\u989c\u2f8a \u6211\u4eec\u53ef\u4ee5\u4f7f\u2f64 #define \u5b9a\u4e49\u5e38\u91cf，\u4e3a\u4ec0\u4e48\u2fae\u8981\u4f7f\u2f64\u679a\u4e3e？<\/p>\n \u679a\u4e3e\u7684\u4f18\u70b9：<\/p>\n #include<stdio.h> int main() \/\/ blue = 6; \/\/ error – \u679a\u4e3e\u5e38\u91cf\u662f\u4e0d\u80fd\u6539\u53d8\u7684 return 0; \u90a3\u662f\u5426\u53ef\u4ee5\u62ff\u6574\u6570\u7ed9\u679a\u4e3e\u53d8\u91cf\u8d4b\u503c\u5462？\u5728C\u8bed\u2f94\u4e2d\u662f\u53ef\u4ee5\u7684，\u4f46\u662f\u5728C++\u662f\u4e0d\u2f8f\u7684，C++\u7684\u7c7b\u578b\u68c0\u67e5\u2f50\u8f83\u4e25\u683c\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":" \u4e00.\u7ed3\u6784\u4f531.\u7ed3\u6784\u4f53\u57fa\u672c\u77e5\u8bc6\u7ed3\u6784\u662f\u2f00\u4e9b\u503c\u7684\u96c6\u5408，\u8fd9\u4e9b\u503c\u79f0\u4e3a\u6210\u5458\u53d8\u91cf\u3002\u7ed3\u6784\u7684\u6bcf\u4e2a\u6210\u5458\u53ef\u4ee5\u662f\u4e0d\u540c\u7c7b\u578b\u7684\u53d8\u91cf\u30022.\u7ed3\u6784\u4f53\u7684\u8bf4\u660e\u7ed3\u6784\u4f53\u58f0\u660e\u8bed\u6cd5struct tag\n
\n
\ntypedef struct
\n{
\n int a;
\n char b;
\n float c;
\n} MyStruct; \/\/ \u8fd9\u6837\u5c31\u6709\u4e86\u7c7b\u578b\u540d<\/p>\n
\nMyStruct s2 = { 2, 'b', 2.71 };
\nMyStruct* p = &s1; \/\/ \u73b0\u5728\u53ef\u4ee5\u4e86<\/p>\n
\n5.\u7ed3\u6784\u7684\u2f83\u5f15\u2f64<\/h3>\n<\/p>\n
\nstruct Node
\n{
\n int data;
\n struct Node next;
\n};<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121712-6a6c9248bc622.png\")
<\/p>\n
\nstruct Node
\n{
\n int data;
\n struct Node* next;
\n};<\/p>\n
\n{
\n int data;
\n Node* next;
\n}Node;<\/p>\n
\n{
\nint data;
\nstruct Node* next;
\n}Node;<\/p>\n
\n6.\u7ed3\u6784\u4f53\u5185\u5b58\u5bf9\u2eec<\/h3>\n
\n\u8fd9\u4e5f\u662f\u2f00\u4e2a\u7279\u522b\u70ed\u2ed4\u7684\u8003\u70b9： \u7ed3\u6784\u4f53\u5185\u5b58\u5bf9\u2eec.<\/span><\/p>\n\u5bf9\u2eec\u89c4\u5219<\/h4>\n
\n
\n
\u7ec3\u4e601：<\/h5>\n
\n{
\nchar c1;
\nint i;
\nchar c2;
\n};
\nprintf("%d\\\\n", sizeof(struct S1));<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121712-6a6c9248ce91a.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121712-6a6c9248e76ff.png\")
<\/p>\n
\n\u7ec3\u4e602：<\/h5>\n
\n{
\nchar c1;
\nchar c2;
\nint i;
\n};
\nprintf("%d\\\\n", sizeof(struct S2));<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c92490fea6.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c9249279a9.png\")
<\/p>\n
\n\u7ec3\u4e603：<\/h5>\n
\n{
\ndouble d;
\nchar c;
\nint i;
\n};
\nprintf("%d\\\\n", sizeof(struct S3));<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c92493e6f0.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c92495eed9.png\")
<\/p>\n
\n\u7ec3\u4e604：(\u7ed3\u6784\u4f53\u5d4c\u5957）<\/h5>\n
\nstruct S4
\n{
\nchar c1;
\nstruct S3 s3;
\ndouble d;
\n};
\nprintf("%d\\\\n", sizeof(struct S4));<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c9249783e3.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c924993310.png\")
<\/p>\n
\n7.\u4e3a\u4ec0\u4e48\u5b58\u5728\u5185\u5b58\u5bf9\u2eec?<\/h3>\n
\n
\n
\n\u603b\u4f53\u6765\u8bf4：\u7ed3\u6784\u4f53\u7684\u5185\u5b58\u5bf9\u2eec\u662f\u62ff\u7a7a\u95f4\u6765\u6362\u53d6\u65f6\u95f4\u7684\u505a\u6cd5\u3002<\/span><\/span><\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c9249ae13d.png\")
<\/p>\n
\n
\n{
\n char c1;
\n int i;
\n char c2;
\n};<\/p>\n
\n{
\n char c1;
\n char c2;
\n int i;
\n};<\/p>\n
\n8.\u4fee\u6539\u9ed8\u8ba4\u5bf9\u2eec\u6570<\/h3>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121713-6a6c9249cf459.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924a01c8a.png\")
<\/p>\n\n
\n9.\u7ed3\u6784\u4f53\u4f20\u53c2<\/h3>\n
\n{
\n int data[1000];
\n int num;
\n};<\/p>\n
\nvoid print1(struct S s)
\n{
\n printf("%d\\\\n", s.num);
\n}<\/p>\n
\nvoid print2(struct S* ps)
\n{
\n printf("%d\\\\n", ps->num);
\n}<\/p>\n
\n{
\n print1(s); \/\/ \u4f20\u7ed3\u6784\u4f53
\n print2(&s); \/\/ \u4f20\u5730\u5740
\n return 0;
\n}<\/p>\n
\n
\n
\n10.\u7ed3\u6784\u4f53\u5b9e\u73b0\u4f4d\u6bb5<\/h3>\n
1. \u4ec0\u4e48\u662f\u4f4d\u6bb5<\/h4>\n
\n{
\nint _a:2;
\nint _b:5;
\nint _c:10;
\nint _d:30;
\n};<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924a1acd5.png\")
<\/p>\n
\n2.\u4f4d\u6bb5\u7684\u5185\u5b58\u5206\u914d<\/h4>\n<\/p>\n
\n{
\nchar a:3;
\nchar b:4;
\nchar c:5;
\nchar d:4;
\n};
\nstruct S s = {0};
\ns.a = 10;
\ns.b = 12;
\ns.c = 3;
\ns.d = 4;<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924a42549.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924a6816b.png\")
<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924a7e0c9.png\")
<\/p>\n
\n3.\u4f4d\u6bb5\u7684\u8de8\u5e73\u53f0\u95ee\u9898<\/h4>\n
\n4.\u4f4d\u6bb5\u7684\u5e94\u2f64<\/h4>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924aa6ddc.png\")
<\/p>\n
\n5. \u4f4d\u6bb5\u4f7f\u2f64\u7684\u6ce8\u610f\u4e8b\u9879<\/h4>\n
\nstruct A
\n{
\nint _a : 2;
\nint _b : 5;
\nint _c : 10;
\nint _d : 30;
\n};
\nint main()
\n{
\nstruct A sa = { 0 };
\nscanf("%d", &sa._b);\/\/\u8fd9\u662f\u9519\u8bef\u7684
\n\/\/\u6b63\u786e\u7684\u2f70\u8303
\nint b = 0;
\nscanf("%d", &b);
\nsa._b = b;
\nreturn 0;
\n}<\/p>\n
\n\u4e8c.\u8054\u5408\u4f53<\/h2>\n
1. \u8054\u5408\u4f53\u7c7b\u578b\u7684\u58f0\u660e<\/h3>\n
\n\u4f46\u662f\u7f16\u8bd1\u5668\u53ea\u4e3a\u6700\u2f24\u7684\u6210\u5458\u5206\u914d\u2f9c\u591f\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u8054\u5408\u4f53\u7684\u7279\u70b9\u662f\u6240\u6709\u6210\u5458\u5171\u2f64\u540c\u2f00\u5757\u5185\u5b58\u7a7a\u95f4\u3002\u6240\u4ee5\u8054\u5408\u4f53\u4e5f\u53eb：\u5171\u2f64\u4f53\u3002<\/span><\/p>\n
\n\/\/\u8054\u5408\u7c7b\u578b\u7684\u58f0\u660e
\nunion Un
\n{
\nchar c;
\nint i;
\n};
\nint main()
\n{
\n\/\/\u8054\u5408\u53d8\u91cf\u7684\u5b9a\u4e49
\nunion Un un = { 0 };
\n\/\/\u8ba1\u7b97\u8fde\u4e2a\u53d8\u91cf\u7684\u2f24\u2f29
\nprintf("%d\\\\n", sizeof(un));
\nreturn 0;
\n}<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924abfe0d.png\")
<\/p>\n
\n{
\n char c; \/\/1
\n int i; \/\/4
\n};<\/p>\n
\n{
\n union Un u;
\n printf("%p\\\\n", &u);
\n printf("%p\\\\n", &(u.c));
\n printf("%p\\\\n", &(u.i));<\/p>\n
\n}<\/p>\n
\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731121714-6a6c924ad7aca.png\")
<\/p>\n![\"\"](\"2026-07-31osxupxokqku.png\")
<\/p>\n
\n2.\u76f8\u540c\u6210\u5458\u7684\u7ed3\u6784\u4f53\u548c\u8054\u5408\u4f53\u5bf9\u2f50<\/h3>\n
\n{
\nchar c;
\nint i;
\n};
\nstruct S s = {0};<\/p>\n
\n{
\nchar c;
\nint i;
\n};
\nunion Un un = {0};<\/p>\n![\"\"](\"2026-07-31btanvcqa3e2.png\")
<\/p>\n
\n3. \u8054\u5408\u4f53\u2f24\u2f29\u7684\u8ba1\u7b97<\/h3>\n
\n
\nunion Un1
\n{
\nchar c[5];
\nint i;
\n};
\nunion Un2
\n{
\nshort c[7];
\nint i;
\n};
\nint main()
\n{
\n\/\/\u4e0b\u2faf\u8f93\u51fa\u7684\u7ed3\u679c\u662f\u4ec0\u4e48？
\nprintf("%d\\\\n", sizeof(union Un1));
\nprintf("%d\\\\n", sizeof(union Un2));
\nreturn 0;
\n}<\/p>\n![\"\"](\"2026-07-31slohzd4lp5h.png\")
<\/p>\n
\n
\n\u6bcf\u2f00\u79cd\u5546\u54c1\u90fd\u6709：\u5e93\u5b58\u91cf\u3001\u4ef7\u683c\u3001\u5546\u54c1\u7c7b\u578b\u548c\u5546\u54c1\u7c7b\u578b\u76f8\u5173\u7684\u5176\u4ed6\u4fe1\u606f\u3002
\n\u56fe\u4e66：\u4e66\u540d\u3001\u4f5c\u8005\u3001\u2eda\u6570
\n\u676f\u2f26：\u8bbe\u8ba1
\n\u886c\u886b：\u8bbe\u8ba1\u3001\u53ef\u9009\u989c\u2f8a\u3001\u53ef\u9009\u5c3a\u2f28<\/p>\n
\n{
\n\/\/\u516c\u5171\u5c5e\u6027
\nint stock_number;\/\/\u5e93\u5b58\u91cf
\ndouble price; \/\/\u5b9a\u4ef7
\nint item_type;\/\/\u5546\u54c1\u7c7b\u578b
\n\/\/\u7279\u6b8a\u5c5e\u6027
\nchar title[20];\/\/\u4e66\u540d
\nchar author[20];\/\/\u4f5c\u8005
\nint num_pages;\/\/\u2eda\u6570
\nchar design[30];\/\/\u8bbe\u8ba1
\nint colors;\/\/\u989c\u2f8a
\nint sizes;\/\/\u5c3a\u2f28
\n};<\/p>\n
\n\u5546\u54c1\u662f\u56fe\u4e66，\u5c31\u4e0d\u9700\u8981design\u3001colors\u3001sizes\u3002
\n\u6240\u4ee5\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u516c\u5171\u5c5e\u6027\u5355\u72ec\u5199\u51fa\u6765，\u5269\u4f59\u5c5e\u4e8e\u5404\u79cd\u5546\u54c1\u672c\u2f9d\u7684\u5c5e\u6027\u4f7f\u2f64\u8054\u5408\u4f53\u8d77\u6765，\u8fd9\u6837\u5c31\u53ef\u4ee5\u4ecb\u7ecd\u6240\u9700\u7684\u5185\u5b58\u7a7a\u95f4，\u2f00\u5b9a\u7a0b\u5ea6\u4e0a\u8282\u7701\u4e86\u5185\u5b58\u3002<\/span><\/p>\n
\n{
\n int stock_number;\/\/\u5e93\u5b58\u91cf
\n double price; \/\/\u5b9a\u4ef7
\n int item_type;\/\/\u5546\u54c1\u7c7b\u578b
\nunion {
\n struct
\n {
\n char title[20];\/\/\u4e66\u540d
\n char author[20];\/\/\u4f5c\u8005
\n int num_pages;\/\/\u2eda\u6570
\n }book;<\/p>\n
\n {
\n char design[30];\/\/\u8bbe\u8ba1
\n }mug;<\/p>\n
\n {
\n char design[30];\/\/\u8bbe\u8ba1
\n int colors;\/\/\u989c\u2f8a
\n int sizes;\/\/\u5c3a\u2f28
\n }shirt;
\n }item;
\n};<\/p>\n
\n4.\u8054\u5408\u7684\u2f00\u4e2a\u7ec3\u4e60（\u5224\u65ad\u5927\u5c0f\u7aef）<\/h3>\n
\n
\n
\u5730\u57400x000x010x020x03<\/tr>\n \n\n \u5927\u7aef<\/td>\n 11<\/td>\n 22<\/td>\n 33<\/td>\n 44<\/td>\n<\/tr>\n \n \u5c0f\u7aef<\/td>\n 44<\/td>\n 33<\/td>\n 22<\/td>\n 11<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u65b9\u6cd5\u4e00：\u7528\u6307\u9488\u5224\u65ad<\/h4>\n
\n{
\n int a = 1; \/\/ 0x00000001
\n return *(char*)&a; \/\/ \u53d6\u7b2c\u4e00\u4e2a\u5b57\u8282
\n}<\/p>\n
\n{
\n int ret = check_sys();
\n if (ret == 1)
\n printf("\u5c0f\u7aef\\\\n"); \/\/ \u7b2c\u4e00\u4e2a\u5b57\u8282\u662f 01，\u8bf4\u660e\u4f4e\u5730\u5740\u5b58\u4f4e\u4f4d
\n else
\n printf("\u5927\u7aef\\\\n"); \/\/ \u7b2c\u4e00\u4e2a\u5b57\u8282\u662f 00，\u8bf4\u660e\u4f4e\u5730\u5740\u5b58\u9ad8\u4f4d
\n return 0;
\n}<\/p>\n
\n\u65b9\u6cd5\u4e8c：\u7528\u8054\u5408\u4f53\u5224\u65ad<\/h4>\n
\n{
\n union U
\n {
\n char c;
\n int i;
\n } u;<\/p>\n
\n return u.c; \/\/ \u53d6\u7684\u662f int \u7684\u7b2c\u4e00\u4e2a\u5b57\u8282
\n}<\/p>\n
\n{
\n int ret = check_sys();
\n if (ret == 1)
\n printf("\u5c0f\u7aef\\\\n");
\n else
\n printf("\u5927\u7aef\\\\n");
\n return 0;
\n}<\/p>\n
\n\u4e09. \u679a\u4e3e\u7c7b\u578b<\/h2>\n
1.\u679a\u4e3e\u7684\u5b9a\u4e49<\/h3>\n<\/p>\n
2. \u679a\u4e3e\u7c7b\u578b\u7684\u58f0\u660e<\/h3>\n
\n{
\nRED=2,
\nGREEN=4,
\nBLUE=8
\n};<\/p>\n
\n{
\nRED=2,
\nGREEN=4,
\nBLUE=8
\n};<\/p>\n
\n3.\u00a0\u679a\u4e3e\u7c7b\u578b\u7684\u4f18\u70b9<\/h3>\n
\n
\n4.\u679a\u4e3e\u7c7b\u578b\u7684\u4f7f\u2f64<\/h3>\n
\nenum Color
\n{
\n red,\/\/0
\n yellow,\/\/1
\n blue\/\/1
\n};<\/p>\n
\n{
\n enum Color c = blue; \/\/ \u521b\u5efa\u4e00\u4e2a\u53d8\u91cfc，\u5e76\u5c06blue\u8d4b\u7ed9\u5b83
\n c = yellow; \/\/ \u8fd9\u65f6\u5c06yellow\u8d4b\u7ed9\u5b83，\u5b8c\u5168\u6ca1\u6709\u95ee\u9898
\n \/\/ \u53ea\u80fd\u62ff\u679a\u4e3e\u5e38\u91cf\u7ed9\u679a\u4e3e\u53d8\u91cf\u8d4b\u503c，\u624d\u4e0d\u4f1a\u51fa\u73b0\u7c7b\u578b\u7684\u5dee\u5f02<\/p>\n
\n printf("%d\\\\n", c);<\/p>\n
\n}<\/p>\n![\"\"](\"2026-07-31np2aacjw1gp.png\")
<\/p>\n![\"\"](\"2026-07-31db4wuvpo1q4.png\")
<\/p>\n
\n{member-list; \/\/ \u6210\u5458\u5217\u8868
\n} variable-list; \/\/ \u53d8\u91cf\u5217\u8868（\u53ef\u9009）\u793a\u4f8b：\u63cf\u8ff0\u4e00\u4e2a\u5b66\u751fstruct Stu
\n{char name[20]; \/\/ \u540d\u5b57int age; \/\/ \u5e74\u9f84char sex[5]; \/\/ <\/p>\n","protected":false},"author":2,"featured_media":88257,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[9099,10003,10001,10002,174,190],"topic":[],"class_list":["post-88277","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-9099","tag-10003","tag-10001","tag-10002","tag-c","tag-190"],"yoast_head":"\n