\n| sizeof(&arr[0] + 1)<\/td>\n | char*<\/td>\n | 8<\/td>\n | \u9996\u5143\u7d20\u6307\u9488\u52a0 1，\u8fd8\u662f\u6307\u9488<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6240\u4ee5 64 \u4f4d\u8f93\u51fa\u662f：<\/p>\n text<\/p>\n 7
\n8
\n1
\n1
\n8
\n8
\n8<\/p>\n \u8fd9\u91cc\u6700\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u662f &arr + 1\u3002&arr \u7684\u7c7b\u578b\u662f char (*)[7]，\u5b83\u6307\u5411\u6574\u4e2a\u6570\u7ec4\u3002&arr + 1 \u4e0d\u662f\u8df3\u8fc7 1 \u4e2a\u5b57\u8282，\u800c\u662f\u8df3\u8fc7\u6574\u4e2a\u6570\u7ec4 7 \u4e2a\u5b57\u8282\u3002\u4f46 sizeof \u53ea\u5173\u5fc3\u7c7b\u578b，\u5b83\u4e0d\u4f1a\u771f\u7684\u53bb\u8bbf\u95ee\u5185\u5b58，\u6240\u4ee5\u7ed3\u679c\u4ecd\u7136\u662f\u6307\u9488\u5927\u5c0f 8\u3002<\/p>\n \u9762\u8bd5\u5e38\u95ee：<\/p>\n arr \u548c &arr \u7684\u503c\u4e00\u6837\u5417？
\n\u7b54：\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5730\u5740\u503c\u4e00\u6837，\u4f46\u7c7b\u578b\u4e0d\u4e00\u6837，\u6b65\u957f\u4e0d\u4e00\u6837\u3002arr + 1 \u8df3 1 \u5b57\u8282，&arr + 1 \u8df3 7 \u5b57\u8282\u3002<\/p>\n
\n\u4e09\u3001\u4ee3\u7801\u4e8c：strlen \u7248\u5b57\u7b26\u6570\u7ec4，\u8fd9\u91cc\u5f00\u59cb\u6709\u5751<\/h3>\nc<\/p>\n #include <stdio.h>
\n#include <string.h><\/p>\n int main()
\n{
\n char arr[] = "abcdef";
\n printf("%d\\\\n", strlen(arr));
\n printf("%d\\\\n", strlen(arr + 0));
\n printf("%d\\\\n", strlen(*arr));
\n printf("%d\\\\n", strlen(arr[1]));
\n printf("%d\\\\n", strlen(&arr));
\n printf("%d\\\\n", strlen(&arr + 1));
\n printf("%d\\\\n", strlen(&arr[0] + 1));
\n return 0;
\n}<\/p>\n \u9010\u884c\u770b：<\/p>\n \n\u8868\u8fbe\u5f0f\u7ed3\u679c\u89e3\u91ca<\/tr>\n \n\n| strlen(arr)<\/td>\n | 6<\/td>\n | \u4ece 'a' \u5f00\u59cb\u6570\u5230 '\\\\0' \u524d，6 \u4e2a\u5b57\u7b26<\/td>\n<\/tr>\n | \n| strlen(arr + 0)<\/td>\n | 6<\/td>\n | \u540c\u4e0a<\/td>\n<\/tr>\n | \n| strlen(*arr)<\/td>\n | \u672a\u5b9a\u4e49\u884c\u4e3a<\/td>\n | *arr \u662f\u5b57\u7b26 'a'，ASCII 97\u3002strlen \u4f1a\u628a 97 \u5f53\u5730\u5740<\/td>\n<\/tr>\n | \n| strlen(arr[1])<\/td>\n | \u672a\u5b9a\u4e49\u884c\u4e3a<\/td>\n | arr[1] \u662f 'b'，ASCII 98，\u540c\u6837\u88ab\u5f53\u5730\u5740<\/td>\n<\/tr>\n | \n| strlen(&arr)<\/td>\n | \u901a\u5e38 6<\/td>\n | &arr \u5730\u5740\u503c\u7b49\u4e8e arr，\u4f46\u7c7b\u578b\u662f char (*)[7]，\u7c7b\u578b\u4e0d\u5339\u914d<\/td>\n<\/tr>\n | \n| strlen(&arr + 1)<\/td>\n | \u672a\u5b9a\u4e49\u884c\u4e3a<\/td>\n | \u8df3\u8fc7\u6574\u4e2a\u6570\u7ec4，\u6307\u5411\u6570\u7ec4\u540e\u9762，\u8d8a\u754c\u8bfb<\/td>\n<\/tr>\n | \n| strlen(&arr[0] + 1)<\/td>\n | 5<\/td>\n | \u4ece 'b' \u5f00\u59cb\u6570，\u5269\u4e0b bcdef，\u957f\u5ea6 5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6240\u4ee5\u6b63\u5e38\u80fd\u786e\u5b9a\u7684\u662f：<\/p>\n text<\/p>\n 6
\n6
\n\u5d29\u6e83\/\u672a\u5b9a\u4e49
\n\u5d29\u6e83\/\u672a\u5b9a\u4e49
\n6（\u4f46\u4e0d\u5efa\u8bae\u4f9d\u8d56）
\n\u672a\u5b9a\u4e49
\n5<\/p>\n \u8fd9\u91cc\u5fc5\u987b\u91cd\u70b9\u8bb2 strlen(*arr)\u3002<\/p>\n strlen \u7684\u539f\u578b\u662f：<\/p>\n c<\/p>\n size_t strlen(const char *str);<\/p>\n \u5b83\u8981\u7684\u662f\u5730\u5740\u3002\u4f60\u7ed9\u5b83 *arr，\u5b83\u62ff\u5230\u7684\u662f\u5b57\u7b26 'a'，\u4e5f\u5c31\u662f\u6574\u6570 97\u3002\u4e8e\u662f\u5b83\u628a\u5185\u5b58\u5730\u5740 0x0000000000000061 \u5f53\u6210\u5b57\u7b26\u4e32\u8d77\u70b9，\u53bb\u90a3\u91cc\u627e '\\\\0'\u3002\u8fd9\u5730\u5740\u901a\u5e38\u4e0d\u53ef\u8bbf\u95ee，\u6240\u4ee5\u7a0b\u5e8f\u5927\u6982\u7387\u76f4\u63a5 segmentation fault\u3002<\/p>\n \u8fd9\u7c7b\u9519\u8bef\u5728\u9762\u8bd5\u91cc\u975e\u5e38\u7231\u8003，\u56e0\u4e3a\u5b83\u80fd\u533a\u5206\u201c\u4f60\u53ea\u662f\u80cc\u4e86\u7b54\u6848\u201d\u8fd8\u662f\u201c\u4f60\u771f\u7684\u77e5\u9053\u6307\u9488\u548c\u5b57\u7b26\u7684\u533a\u522b\u201d\u3002<\/p>\n strlen(&arr) \u4e5f\u503c\u5f97\u8bf4\u4e00\u53e5\u3002&arr \u7c7b\u578b\u662f char (*)[7]，\u4f20\u7ed9 strlen \u7c7b\u578b\u4e0d\u517c\u5bb9，\u7f16\u8bd1\u5668\u4e00\u822c\u4f1a\u8b66\u544a\u3002\u53ea\u662f\u5b83\u7684\u5730\u5740\u503c\u548c arr \u76f8\u540c，\u6240\u4ee5\u8fd0\u884c\u65f6\u5f88\u591a\u73af\u5883\u4f1a\u8f93\u51fa 6\u3002\u4f46\u5de5\u7a0b\u91cc\u4e0d\u8981\u8fd9\u4e48\u5199，\u8003\u8bd5\u91cc\u5982\u679c\u95ee\u201c\u8f93\u51fa\u4ec0\u4e48\u201d，\u53ef\u4ee5\u7b54\u201c\u5e38\u89c1\u73af\u5883\u662f 6，\u4f46\u7c7b\u578b\u4e0d\u5339\u914d，\u89c4\u8303\u4e0a\u5e94\u907f\u514d\u201d\u3002<\/p>\n
\n\u56db\u3001\u4ee3\u7801\u4e09：sizeof \u7248\u5b57\u7b26\u6307\u9488<\/h3>\nc<\/p>\n #include <stdio.h><\/p>\n int main()
\n{
\n char* p = "abcdef";
\n printf("%d\\\\n", sizeof(p));
\n printf("%d\\\\n", sizeof(p + 1));
\n printf("%d\\\\n", sizeof(*p));
\n printf("%d\\\\n", sizeof(p[0]));
\n printf("%d\\\\n", sizeof(&p));
\n printf("%d\\\\n", sizeof(&p + 1));
\n printf("%d\\\\n", sizeof(&p[0] + 1));
\n return 0;
\n}<\/p>\n \u8fd9\u6b21 p \u662f\u6307\u9488\u53d8\u91cf，\u4e0d\u662f\u6570\u7ec4\u3002<\/p>\n \n\u8868\u8fbe\u5f0f\u7c7b\u578b64 \u4f4d\u7ed3\u679c\u89e3\u91ca<\/tr>\n \n\n| sizeof(p)<\/td>\n | char*<\/td>\n | 8<\/td>\n | \u6307\u9488\u53d8\u91cf\u5927\u5c0f<\/td>\n<\/tr>\n | \n| sizeof(p + 1)<\/td>\n | char*<\/td>\n | 8<\/td>\n | \u6307\u9488\u52a0 1，\u8fd8\u662f\u6307\u9488<\/td>\n<\/tr>\n | \n| sizeof(*p)<\/td>\n | char<\/td>\n | 1<\/td>\n | p \u6307\u5411\u7684\u5b57\u7b26 'a'<\/td>\n<\/tr>\n | \n| sizeof(p[0])<\/td>\n | char<\/td>\n | 1<\/td>\n | \u7b49\u4ef7 *p<\/td>\n<\/tr>\n | \n| sizeof(&p)<\/td>\n | char**<\/td>\n | 8<\/td>\n | \u6307\u9488\u53d8\u91cf\u81ea\u5df1\u7684\u5730\u5740<\/td>\n<\/tr>\n | \n| sizeof(&p + 1)<\/td>\n | char**<\/td>\n | 8<\/td>\n | \u6307\u5411\u6307\u9488\u7684\u6307\u9488，\u52a0 1 \u8fd8\u662f\u6307\u9488<\/td>\n<\/tr>\n | \n| sizeof(&p[0] + 1)<\/td>\n | char*<\/td>\n | 8<\/td>\n | &p[0] \u662f char*，\u52a0 1 \u8fd8\u662f char*<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u8f93\u51fa：<\/p>\n text<\/p>\n 8
\n8
\n1
\n1
\n8
\n8
\n8<\/p>\n \u6ce8\u610f，sizeof(p) \u4e0d\u662f 6，\u4e5f\u4e0d\u662f 7\u3002p \u53ea\u662f\u6307\u9488，\u5b83\u4e0d\u643a\u5e26\u201c\u6211\u6307\u5411\u7684\u5b57\u7b26\u4e32\u6709\u591a\u957f\u201d\u7684\u4fe1\u606f\u3002\u8fd9\u662f C \u8bed\u8a00\u548c\u5f88\u591a\u9ad8\u7ea7\u8bed\u8a00\u4e0d\u4e00\u6837\u7684\u5730\u65b9\u3002C \u91cc\u5b57\u7b26\u4e32\u957f\u5ea6\u8981\u9760 '\\\\0' \u6807\u8bb0，\u6216\u8005\u4f60\u53e6\u5916\u5b58\u4e00\u4e2a\u957f\u5ea6\u53d8\u91cf\u3002<\/p>\n
\n\u4e94\u3001\u4ee3\u7801\u56db：strlen \u7248\u5b57\u7b26\u6307\u9488，\u5751\u66f4\u6df1<\/h3>\nc<\/p>\n #include <stdio.h>
\n#include <string.h><\/p>\n int main()
\n{
\n char* p = "abcdef";
\n printf("%d\\\\n", strlen(p));
\n printf("%d\\\\n", strlen(p + 1));
\n printf("%d\\\\n", strlen(*p));
\n printf("%d\\\\n", strlen(p[0]));
\n printf("%d\\\\n", strlen(&p));
\n printf("%d\\\\n", strlen(&p + 1));
\n printf("%d\\\\n", strlen(&p[0] + 1));
\n return 0;
\n}<\/p>\n \n\u8868\u8fbe\u5f0f\u7ed3\u679c\u89e3\u91ca<\/tr>\n \n\n| strlen(p)<\/td>\n | 6<\/td>\n | \u4ece 'a' \u5f00\u59cb\u6570<\/td>\n<\/tr>\n | \n| strlen(p + 1)<\/td>\n | 5<\/td>\n | \u4ece 'b' \u5f00\u59cb\u6570<\/td>\n<\/tr>\n | \n| strlen(*p)<\/td>\n | \u672a\u5b9a\u4e49\u884c\u4e3a<\/td>\n | *p \u662f 'a'，\u88ab\u5f53\u5730\u5740<\/td>\n<\/tr>\n | \n| strlen(p[0])<\/td>\n | \u672a\u5b9a\u4e49\u884c\u4e3a<\/td>\n | \u540c\u4e0a<\/td>\n<\/tr>\n | \n| strlen(&p)<\/td>\n | \u672a\u5b9a\u4e49\/\u4e0d\u786e\u5b9a<\/td>\n | &p \u662f p \u53d8\u91cf\u81ea\u5df1\u7684\u5730\u5740，\u4e0d\u662f\u5b57\u7b26\u4e32\u5730\u5740<\/td>\n<\/tr>\n | \n| strlen(&p + 1)<\/td>\n | \u672a\u5b9a\u4e49\u884c\u4e3a<\/td>\n | \u8d8a\u754c\u8bfb<\/td>\n<\/tr>\n | \n| strlen(&p[0] + 1)<\/td>\n | 5<\/td>\n | \u7b49\u4ef7 strlen(p + 1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u80fd\u786e\u5b9a\u7684\u662f：<\/p>\n text<\/p>\n 6
\n5
\n\u5d29\u6e83\/\u672a\u5b9a\u4e49
\n\u5d29\u6e83\/\u672a\u5b9a\u4e49
\n\u4e0d\u786e\u5b9a\/\u672a\u5b9a\u4e49
\n\u672a\u5b9a\u4e49
\n5<\/p>\n \u91cd\u70b9\u8bf4 strlen(&p)\u3002<\/p>\n p \u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf，\u5b83\u81ea\u5df1\u5360 8 \u5b57\u8282，\u91cc\u9762\u5b58\u7684\u662f\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u7684\u5730\u5740\u3002&p \u662f\u201c\u5b58\u653e\u8fd9\u4e2a\u6307\u9488\u53d8\u91cf\u7684\u5185\u5b58\u5730\u5740\u201d，\u7c7b\u578b\u662f char**\u3002strlen(&p) \u4f1a\u628a p \u8fd9\u4e2a\u53d8\u91cf\u6240\u5360\u7684\u5185\u5b58\u5b57\u8282\u5f53\u6210\u5b57\u7b26\u4e32\u6765\u6570\u3002\u5b83\u4f1a\u4ece\u6808\u4e0a\u8bfb\u5b57\u8282，\u76f4\u5230\u9047\u5230\u67d0\u4e2a 0 \u5b57\u8282\u3002\u7ed3\u679c\u53d6\u51b3\u4e8e\u6808\u5e03\u5c40\u3001\u5730\u5740\u503c\u3001\u7f16\u8bd1\u5668，\u5b8c\u5168\u4e0d\u53ef\u79fb\u690d\u3002<\/p>\n \u6240\u4ee5\u5982\u679c\u4f60\u5728\u67d0\u4e9b\u73af\u5883\u770b\u5230 strlen(&p) \u8f93\u51fa 3\u30010\u30016 \u751a\u81f3\u522b\u7684\u6570，\u90fd\u4e0d\u8981\u60ca\u8bb6\u3002\u8fd9\u4e0d\u662f\u201c\u7b54\u6848\u201d，\u8fd9\u662f\u672a\u5b9a\u4e49\u884c\u4e3a\u5728\u78b0\u8fd0\u6c14\u3002<\/p>\n
\n\u516d\u3001\u9762\u8bd5\u7b14\u8bd5\u9ad8\u9891\u6e05\u5355：\u8fd9\u9898\u5230\u5e95\u5728\u8003\u4ec0\u4e48？<\/h3>\n\u628a\u4e0a\u9762\u56db\u6bb5\u4ee3\u7801\u538b\u7f29\u6210\u4e00\u5f20\u6e05\u5355，\u4f60\u590d\u4e60\u65f6\u76f4\u63a5\u80cc\u8fd9\u5f20：<\/p>\n \nsizeof \u662f\u8fd0\u7b97\u7b26，strlen \u662f\u51fd\u6570\u3002<\/p>\n<\/li>\n \nsizeof \u53ea\u770b\u7c7b\u578b，\u7f16\u8bd1\u671f\u6c42\u503c；strlen \u8fd0\u884c\u671f\u627e '\\\\0'\u3002<\/p>\n<\/li>\n \n\u6570\u7ec4\u540d\u5728\u5927\u591a\u6570\u8868\u8fbe\u5f0f\u91cc\u9000\u5316\u4e3a\u9996\u5143\u7d20\u6307\u9488\u3002<\/p>\n<\/li>\n \nsizeof(arr) \u4e0d\u9000\u5316\u4e3a\u6307\u9488，\u5f97\u5230\u6574\u4e2a\u6570\u7ec4\u5927\u5c0f\u3002<\/p>\n<\/li>\n \n&arr \u7c7b\u578b\u662f char (*)[N]，&arr + 1 \u8df3\u8fc7\u6574\u4e2a\u6570\u7ec4\u3002<\/p>\n<\/li>\n \n&arr[0] \u662f\u9996\u5143\u7d20\u6307\u9488，&arr[0] + 1 \u8df3\u8fc7\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<\/li>\n \nstrlen \u53c2\u6570\u5fc5\u987b\u662f\u5408\u6cd5\u7684\u3001\u4ee5 '\\\\0' \u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u5730\u5740\u3002<\/p>\n<\/li>\n \nstrlen(*arr)\u3001strlen(arr[1])\u3001strlen(*p) \u90fd\u662f\u628a\u5b57\u7b26\u5f53\u5730\u5740，\u672a\u5b9a\u4e49\u884c\u4e3a\u3002<\/p>\n<\/li>\n \n\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u4e0d\u53ef\u4fee\u6539，\u5efa\u8bae\u5199 const char* p = "abcdef";\u3002<\/p>\n<\/li>\n \nprintf \u6253\u5370 sizeof\/strlen \u8fd4\u56de\u503c\u7528 %zu，\u4e0d\u8981\u7528 %d\u3002<\/p>\n<\/li>\n \n\u51fd\u6570\u53c2\u6570\u91cc\u7684 char arr[] \u4f1a\u9000\u5316\u6210 char*，sizeof(arr) \u5f97\u5230\u6307\u9488\u5927\u5c0f\u3002<\/p>\n<\/li>\n \n\u672a\u5b9a\u4e49\u884c\u4e3a\u4e0d\u662f\u201c\u7ed3\u679c\u968f\u673a\u201d，\u800c\u662f\u201c\u6807\u51c6\u4e0d\u4fdd\u8bc1\u4efb\u4f55\u7ed3\u679c\u201d，\u53ef\u80fd\u5d29\u6e83，\u4e5f\u53ef\u80fd\u88ab\u4f18\u5316\u6210\u5947\u602a\u903b\u8f91\u3002<\/p>\n<\/li>\n
\n\u4e03\u3001\u4e3a\u4ec0\u4e48 2026 \u5e74\u8fd8\u8981\u5b66\u8fd9\u79cd\u201c\u8001\u53e4\u8463\u201d？<\/h3>\n\u56e0\u4e3a C \u8bed\u8a00\u7684\u5185\u5b58\u6a21\u578b\u4ecd\u7136\u662f\u73b0\u4ee3\u8ba1\u7b97\u673a\u7684\u5e95\u5ea7\u3002<\/p>\n \u5f53\u524d\u8ba1\u7b97\u673a\u524d\u6cbf\u91cc，\u5185\u5b58\u5b89\u5168\u662f\u7edd\u5bf9\u70ed\u70b9\u3002\u5927\u91cf\u5b89\u5168\u6f0f\u6d1e\u90fd\u548c\u7f13\u51b2\u533a\u6ea2\u51fa\u3001\u8d8a\u754c\u8bfb\u5199\u3001\u60ac\u7a7a\u6307\u9488\u3001\u672a\u5b9a\u4e49\u884c\u4e3a\u6709\u5173\u3002strlen(*arr) \u8fd9\u79cd\u4ee3\u7801\u5728\u771f\u5b9e\u9879\u76ee\u91cc\u4e00\u65e6\u88ab\u89e6\u53d1，\u8f7b\u5219\u5d29\u6e83，\u91cd\u5219\u53ef\u80fd\u88ab\u5229\u7528\u3002<\/p>\n \u73b0\u5728\u5de5\u4e1a\u754c\u5e38\u7528\u8fd9\u4e9b\u5de5\u5177\u6765\u6293\u8fd9\u7c7b\u95ee\u9898：<\/p>\n \n- \n
AddressSanitizer：\u6293\u8d8a\u754c\u3001use-after-free<\/p>\n<\/li>\n - \n
UndefinedBehaviorSanitizer：\u6293\u672a\u5b9a\u4e49\u884c\u4e3a<\/p>\n<\/li>\n - \n
Valgrind：\u5185\u5b58\u68c0\u6d4b<\/p>\n<\/li>\n - \n
Fuzzing：\u6a21\u7cca\u6d4b\u8bd5<\/p>\n<\/li>\n - \n
\u9759\u6001\u5206\u6790：Coverity\u3001Clang Static Analyzer\u3001MISRA<\/p>\n<\/li>\n - \n
Rust：\u7528\u6240\u6709\u6743\u548c\u501f\u7528\u68c0\u67e5\u5728\u7f16\u8bd1\u671f\u6321\u4f4f\u5927\u91cf\u5185\u5b58\u9519\u8bef<\/p>\n<\/li>\n - \n
CHERI\u3001\u6307\u9488 provenance：\u786c\u4ef6\u548c\u7f16\u8bd1\u5668\u5c42\u9762\u8ffd\u8e2a\u6307\u9488\u6765\u6e90<\/p>\n<\/li>\n<\/ul>\n \u4f46\u6ce8\u610f，Rust \u518d\u706b，C \u4ecd\u7136\u5728\u64cd\u4f5c\u7cfb\u7edf\u3001\u5d4c\u5165\u5f0f\u3001\u6570\u636e\u5e93\u3001\u7f16\u8bd1\u5668\u3001\u9a71\u52a8\u91cc\u5927\u91cf\u5b58\u5728\u3002\u4f60\u4e0d\u53ef\u80fd\u53ea\u4f1a\u201c\u4e0a\u5c42\u8bed\u8a00\u201d，\u5e95\u5c42\u6307\u9488\u7c7b\u578b\u4e00\u584c\u7cca\u6d82\u3002AI \u7f16\u7a0b\u52a9\u624b\u80fd\u5e2e\u4f60\u5199\u4ee3\u7801，\u4f46\u5b83\u4e5f\u4f1a\u751f\u6210 char* p = "abc"; \u8fd9\u79cd\u6709\u9690\u60a3\u7684\u4ee3\u7801\u3002\u771f\u6b63\u80fd\u515c\u5e95\u7684\u4eba，\u8fd8\u662f\u5f97\u61c2 sizeof \u548c strlen \u7684\u533a\u522b\u3002<\/p>\n
\n\u516b\u3001\u4ece\u6559\u80b2\u5b66\u89d2\u5ea6\u770b：\u4e3a\u4ec0\u4e48\u4f60\u4e00\u770b\u5c31\u4f1a，\u4e00\u8003\u5c31\u5e9f？<\/h3>\n\u8fd9\u91cc\u63d2\u4e00\u70b9\u5b66\u4e60\u65b9\u6cd5，\u4e0d\u662f\u9e21\u6c64，\u662f\u8ba4\u77e5\u79d1\u5b66\u3002<\/p>\n \u7b2c\u4e00，\u5148\u884c\u7ec4\u7ec7\u8005\u3002\u5148\u8bb0\u201csizeof \u770b\u7c7b\u578b，strlen \u627e \\\\0\u201d，\u518d\u505a\u9898\u3002\u6ca1\u6709\u8fd9\u4e2a\u6846\u67b6，\u7ec6\u8282\u8d8a\u591a\u8d8a\u4e71\u3002<\/p>\n \u7b2c\u4e8c，\u8ba4\u77e5\u8d1f\u8377\u63a7\u5236\u3002\u4e0d\u8981\u4e00\u4e0a\u6765\u5c31\u540c\u65f6\u80cc arr\u3001&arr\u3001p\u3001&p\u3002\u5148\u5206\u6570\u7ec4\u7ec4，\u518d\u5206\u6307\u9488\u7ec4\u3002\u6bcf\u7ec4\u53ea\u53d8\u4e00\u4e2a\u7ef4\u5ea6，\u8fd9\u53eb\u53d8\u5f0f\u6559\u5b66\u3002<\/p>\n \u7b2c\u4e09，\u6b63\u4f8b\u53cd\u4f8b\u5bf9\u7167\u3002strlen(arr) \u662f\u6b63\u4f8b，strlen(*arr) \u662f\u53cd\u4f8b\u3002\u53cd\u4f8b\u6bd4\u6b63\u4f8b\u66f4\u80fd\u8ba9\u4f60\u8bb0\u4f4f\u8fb9\u754c\u3002<\/p>\n \u7b2c\u56db，\u6700\u8fd1\u53d1\u5c55\u533a\u3002\u4f60\u5148\u4f1a\u7b97 sizeof(arr)，\u518d\u5b66 sizeof(arr + 0)，\u518d\u5b66 sizeof(&arr + 1)，\u6bcf\u4e00\u6b65\u53ea\u6bd4\u5f53\u524d\u80fd\u529b\u9ad8\u4e00\u70b9，\u8fd9\u53eb\u811a\u624b\u67b6\u3002<\/p>\n \u7b2c\u4e94，\u5f62\u6210\u6027\u8bc4\u4ef7\u3002\u4e0d\u8981\u53ea\u770b\u7b54\u6848，\u8981\u81ea\u5df1\u5148\u9884\u6d4b\u8f93\u51fa，\u518d\u8fd0\u884c，\u518d\u89e3\u91ca\u3002\u9884\u6d4b\u9519\u7684\u5730\u65b9，\u624d\u662f\u4f60\u771f\u6b63\u7684\u77e5\u8bc6\u6f0f\u6d1e\u3002<\/p>\n \u7b2c\u516d，\u5143\u8ba4\u77e5\u3002\u505a\u5b8c\u9898\u95ee\u81ea\u5df1：\u6211\u5230\u5e95\u662f\u5728\u80cc\u7b54\u6848，\u8fd8\u662f\u80fd\u89e3\u91ca\u4e3a\u4ec0\u4e48？\u5982\u679c\u9762\u8bd5\u5b98\u628a char \u6362\u6210 int，\u6211\u8fd8\u4f1a\u4e0d\u4f1a？<\/p>\n
\n\u4e5d\u3001\u7ec3\u4e60\u9898\u4e0e\u9488\u5bf9\u6027\u7b54\u6848（C \u8bed\u8a00\u5b9e\u73b0）<\/h3>\n\u4e0b\u9762\u8fd9\u4e9b\u9898，\u5efa\u8bae\u4f60\u5148\u76d6\u4f4f\u7b54\u6848，\u81ea\u5df1\u5199\u8f93\u51fa\u3002<\/p>\n \u7ec3\u4e60 1<\/h4>\nc<\/p>\n #include <stdio.h>
\n#include <string.h><\/p>\n int main() {
\n char s[] = "hello";
\n printf("%zu %zu\\\\n", sizeof(s), strlen(s));
\n return 0;
\n}<\/p>\n \u7b54\u6848：6 5<\/p>\n \u89e3\u6790："hello" \u662f 5 \u4e2a\u5b57\u7b26\u52a0 '\\\\0'，\u6570\u7ec4\u5927\u5c0f 6；strlen \u4e0d\u7b97 '\\\\0'，\u6240\u4ee5 5\u3002<\/p>\n
\n\u7ec3\u4e60 2<\/h4>\nc<\/p>\n #include <stdio.h>
\n#include <string.h><\/p>\n int main() {
\n char s[10] = "hi";
\n printf("%zu %zu\\\\n", sizeof(s), strlen(s));
\n return 0;
\n}<\/p>\n \u7b54\u6848：10 2<\/p>\n \u89e3\u6790：\u6570\u7ec4\u663e\u5f0f\u5927\u5c0f\u662f 10；\u5b57\u7b26\u4e32\u5185\u5bb9\u662f hi，\u957f\u5ea6 2\u3002\u5269\u4f59\u5b57\u8282\u81ea\u52a8\u8865 0\u3002<\/p>\n
\n\u7ec3\u4e60 3<\/h4>\nc<\/p>\n #include <stdio.h>
\n#include <string.h><\/p>\n int main() {
\n char *s = "hello";
\n printf("%zu %zu\\\\n", sizeof(s), strlen(s));
\n return 0;
\n}<\/p>\n \u7b54\u6848：64 \u4f4d\u4e0b 8 5<\/p>\n \u89e3\u6790：s \u662f\u6307\u9488，\u5927\u5c0f 8；strlen \u6570\u5230 '\\\\0'，\u957f\u5ea6 5\u3002<\/p>\n
\n\u7ec3\u4e60 4<\/h4>\nc<\/p>\n #include <stdio.h><\/p>\n int main() {
\n int a[5];
\n printf("%zu %zu %zu\\\\n", sizeof(a), sizeof(a + 0), sizeof(*a));
\n return 0;
\n}<\/p>\n \u7b54\u6848：64 \u4f4d\u4e0b 20 8 4<\/p>\n \u89e3\u6790：a \u662f int[5]，5 \u00d7 4 = 20；a + 0 \u9000\u5316\u4e3a int*，\u6307\u9488 8；*a \u662f int，4\u3002<\/p>\n
\n\u7ec3\u4e60 5<\/h4>\nc<\/p>\n #include <stdio.h><\/p>\n int main() {
\n char s[] = "abc";
\n printf("%zu %zu %zu\\\\n", sizeof(&s), sizeof(&s + 1), sizeof(&s[0] + 1));
\n return 0;
\n}<\/p>\n \u7b54\u6848：64 \u4f4d\u4e0b 8 8 8<\/p>\n \u89e3\u6790：\u4e09\u4e2a\u90fd\u662f\u6307\u9488，\u5927\u5c0f\u90fd\u662f 8\u3002\u4f46\u6b65\u957f\u4e0d\u540c：&s + 1 \u8df3\u8fc7\u6574\u4e2a\u6570\u7ec4，&s[0] + 1 \u8df3\u8fc7\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
\n\u7ec3\u4e60 6<\/h4>\nc<\/p>\n #include <stdio.h>
\n#include <string.h><\/p>\n int main() {
\n char s[] = "abc";
\n printf("%zu\\\\n", strlen(&s[1]));
\n return 0;
\n}<\/p>\n \u7b54\u6848：2<\/p>\n \u89e3\u6790：\u4ece 'b' \u5f00\u59cb，\u5269\u4e0b bc，\u957f\u5ea6 2\u3002<\/p>\n
\n\u7ec3\u4e60 7<\/h4>\n\u4e0b\u9762\u4ee3\u7801\u4e3a\u4ec0\u4e48\u5371\u9669？<\/p>\n c<\/p>\n #include <string.h><\/p>\n int main() {
\n char *s = "abc";
\n strlen(*s);
\n return 0;
\n}<\/p>\n \u7b54\u6848：*s \u662f\u5b57\u7b26 'a'，\u4e0d\u662f\u5730\u5740\u3002strlen \u4f1a\u628a 'a' \u7684 ASCII \u503c\u5f53\u5730\u5740\u4f7f\u7528，\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a，\u901a\u5e38\u6bb5\u9519\u8bef\u3002<\/p>\n
\n\u7ec3\u4e60 8：\u624b\u5199 my_strlen<\/h4>\nc<\/p>\n #include <stdio.h><\/p>\n size_t my_strlen(const char *s) {
\n const char *p = s;
\n while (*p != '\\\\0') {
\n p++;
\n }
\n return (size_t)(p – s);
\n}<\/p>\n int main() {
\n char s[] = "abcdef";
\n printf("%zu\\\\n", my_strlen(s));
\n return 0;
\n}<\/p>\n \u7b54\u6848：\u8f93\u51fa 6\u3002<\/p>\n
\n\u7ec3\u4e60 9：\u5199\u4e00\u4e2a\u6c42\u6570\u7ec4\u5143\u7d20\u4e2a\u6570\u7684\u5b8f<\/h4>\nc<\/p>\n #include <stdio.h><\/p>\n #define ARRAY_SIZE(a) (sizeof(a) \/ sizeof((a)[0]))<\/p>\n int main() {
\n int a[5];
\n printf("%zu\\\\n", ARRAY_SIZE(a));
\n return 0;
\n}<\/p>\n \u7b54\u6848：5<\/p>\n \u6ce8\u610f：\u8fd9\u4e2a\u5b8f\u53ea\u5728\u6570\u7ec4\u540d\u53ef\u89c1\u7684\u540c\u4e00\u4f5c\u7528\u57df\u6709\u6548\u3002\u5982\u679c\u4f20\u8fdb\u6765\u7684\u662f\u6307\u9488，\u7ed3\u679c\u5c31\u9519\u4e86\u3002<\/p>\n
\n\u7ec3\u4e60 10：\u51fd\u6570\u53c2\u6570\u91cc\u7684\u6570\u7ec4<\/h4>\nc<\/p>\n #include <stdio.h><\/p>\n void f(char arr[]) {
\n printf("%zu\\\\n", sizeof(arr));
\n}<\/p>\n int main() {
\n char s[7] = "abcdef";
\n f(s);
\n return 0;
\n}<\/p>\n \u7b54\u6848：64 \u4f4d\u4e0b 8<\/p>\n \u89e3\u6790：\u51fd\u6570\u53c2\u6570\u4e2d\u7684 char arr[] \u7b49\u4ef7\u4e8e char *arr，\u6570\u7ec4\u540d\u9000\u5316\u6210\u6307\u9488，\u6240\u4ee5 sizeof(arr) \u662f\u6307\u9488\u5927\u5c0f，\u4e0d\u662f 7\u3002<\/p>\n
\n\u5341\u3001\u6700\u540e\u518d\u53ee\u5631\u51e0\u53e5<\/h3>\n\u8fd9\u56db\u6bb5\u4ee3\u7801，\u771f\u6b63\u8981\u4f60\u638c\u63e1\u7684\u4e0d\u662f\u6b7b\u8bb0\u8f93\u51fa，\u800c\u662f\u4e09\u4ef6\u4e8b：<\/p>\n - \n
\u770b\u7c7b\u578b：arr\u3001&arr\u3001&arr[0] \u5230\u5e95\u5404\u662f\u4ec0\u4e48\u7c7b\u578b\u3002<\/p>\n<\/li>\n - \n
\u770b\u9000\u5316：\u6570\u7ec4\u540d\u4ec0\u4e48\u65f6\u5019\u9000\u5316\u6210\u6307\u9488\u3002<\/p>\n<\/li>\n - \n
\u770b\u8fb9\u754c：strlen \u53ea\u63a5\u53d7\u5408\u6cd5\u5b57\u7b26\u4e32\u5730\u5740，\u4f20\u5b57\u7b26\u3001\u4f20 char**\u3001\u4f20\u8d8a\u754c\u5730\u5740\u90fd\u662f\u672a\u5b9a\u4e49\u884c\u4e3a\u3002<\/p>\n<\/li>\n \u5982\u679c\u9762\u8bd5\u5b98\u95ee\u4f60：\u201csizeof(arr) \u548c sizeof(&arr) \u6709\u4ec0\u4e48\u533a\u522b？\u201d
\n\u4f60\u5c31\u7b54：\u524d\u8005\u662f\u6574\u4e2a\u6570\u7ec4\u5927\u5c0f，\u540e\u8005\u662f\u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\u5927\u5c0f\u3002
\n\u5982\u679c\u95ee：\u201cstrlen(&p) \u8f93\u51fa\u4ec0\u4e48？\u201d
\n\u4f60\u5c31\u7b54：\u672a\u5b9a\u4e49\u884c\u4e3a，\u56e0\u4e3a &p \u4e0d\u662f\u5b57\u7b26\u4e32\u5730\u5740，\u800c\u662f\u6307\u9488\u53d8\u91cf\u81ea\u5df1\u7684\u5730\u5740\u3002
\n\u5982\u679c\u95ee：\u201c\u4e3a\u4ec0\u4e48 strlen(*arr) \u4f1a\u5d29？\u201d
\n\u4f60\u5c31\u7b54：*arr \u662f\u5b57\u7b26，\u4e0d\u662f\u5730\u5740，strlen \u628a ASCII \u7801\u5f53\u5730\u5740\u7528\u4e86\u3002<\/p>\n \u628a\u8fd9\u51e0\u53e5\u8bdd\u5403\u900f，\u8fd9\u7ec4\u9898\u5c31\u4e0d\u518d\u662f\u201c\u6df7\u5408\u53cc\u6253\u201d，\u800c\u662f\u4f60\u9762\u8bd5\u65f6\u7684\u9001\u5206\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":" \u5148\u8bf4\u7ed3\u8bba：\u8fd9\u56db\u6bb5\u4ee3\u7801，\u8868\u9762\u4e0a\u662f\u201c\u6253\u5370\u51e0\u4e2a\u6570\u201d，\u5b9e\u9645\u4e0a\u662f C \u8bed\u8a00\u7b14\u8bd5\u9762\u8bd5\u91cc\u6700\u7ecf\u5178\u7684\u201c\u6307\u9488\u7c7b\u578b\u8bc6\u522b \u6570\u7ec4\u9000\u5316 \u672a\u5b9a\u4e49\u884c\u4e3a\u201d\u4e09\u5408\u4e00\u3002\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u505a，\u80fd\u628a strlen(*arr) \u5199\u6210 1，\u628a sizeof(&arr 1) \u5199\u6210 8 \u5374\u4e0d\u77e5\u9053\u4e3a\u4ec0\u4e48，\u6700\u540e\u9762\u8bd5\u5b98\u4e00\u53e5\u201c\u4f60\u786e\u5b9a？\u201d\u5c31\u5f00\u59cb\u5192\u6c57\u3002\u4eca\u5929\u6211\u4e0d\u53ea\u7ed9\u4f60\u7b54\u6848，\u8fd8\u8981\u628a\u80cc\u540e\u7684\u201c\u5730\u56fe\u201d\u94fa\u5f00\u3002\u6559\u80b2\u5b66\u91cc\u6709\u4e2a\u8bcd\u53eb\u201c\u5148\u884c\u7ec4\u7ec7\u8005\u201d&<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,190],"topic":[],"class_list":["post-109828","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-190"],"yoast_head":"\n sizeof \u548c strlen \u5230\u5e95\u5dee\u5728\u54ea\uff1f\u56db\u6bb5\u4ee3\u7801\u628a C \u8bed\u8a00\u6570\u7ec4\u6307\u9488\u6309\u5728\u5730\u4e0a\u6469\u64e6\uff08\u9644 64 \u4f4d\u8f93\u51fa + \u9762\u8bd5\u9898\uff09 - 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