{"id":70273,"date":"2026-02-01T18:49:15","date_gmt":"2026-02-01T10:49:15","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70273.html"},"modified":"2026-02-01T18:49:15","modified_gmt":"2026-02-01T10:49:15","slug":"%e7%ae%97%e6%b3%95%e7%ab%9e%e8%b5%9bc-c%ef%bc%9a%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70273.html","title":{"rendered":"\u7b97\u6cd5\u7ade\u8d5bC\/C++\uff1a\u6570\u636e\u7c7b\u578b"},"content":{"rendered":"

Chapter 2：\u6570\u636e\u7c7b\u578b<\/h2>\n<\/p>\n

\u4e00\u3001\u6570\u636e\u7c7b\u578b<\/h3>\n

\n\u7c7b\u578b，\u662f\u76f8\u4f3c\u7684\u6570\u636e\u6240\u636e\u62e5\u6709\u7684\u5171\u540c\u7279\u5f81
\nC++\u5185\u7b80\u5355\u6570\u636e\u7c7b\u578b：\u5b57\u7b26\u578b，\u6574\u578b，\u6d6e\u70b9\u578b，\u5e03\u5c14\u7c7b\u578b<\/p>\n

\n（1）.\u5b57\u7b26\u578b char\u00a0<\/h4>\n

\na.\u7528\u5355\u5f15\u53f7''\u8868\u793a\u5b57\u7b26，\u7528\u53cc\u5f15\u53f7""\u8868\u793a\u5b57\u7b26\u4e32
\nb.ASCII\u7f16\u7801
\n\u8ba1\u7b97\u673a\u4e2d\u6240\u6709\u6570\u636e（\u5305\u62ec\u5b57\u7b26）\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u5b58\u50a8，\u800cASCII\u7801\u8868\u4e2d\u8bb0\u5f55\u7684\u5c31\u662f\u6bcf\u4e2a\u5b57\u7b26\u7684\u5bf9\u5e94\u7f16\u7801（128\u4e2a）<\/p>\n

\"\"
\n\u5176\u4e2d：\u5b57\u7b26 A~Z \u7684ASCII\u7801\u503c\u4ece<\/span> 65~90<\/span>
\n\u00a0 \u00a0 \u00a0 \u5b57\u7b26 a~z \u7684ASCII\u7801\u503c\u4ece <\/span>97~122<\/span>
\n\u00a0\u00a0 \u00a0 \u00a0\u5bf9\u5e94\u7684\u5927\u5c0f\u5199\u5b57\u7b26（a\u548cA）\u7684ASCII\u7801\u503c\u7684\u5dee\u503c\u4e3a <\/span>32<\/span>
\n\u00a0\u00a0 \u00a0 \u00a0\u6570\u5b57\u5b57\u7b26 0~9 \u7684ASCII\u7801\u503c\u4ece <\/span>48~57<\/span>
\n\u00a0\u00a0 \u00a0 \u00a0\u6362\u884c \\\\n \u7684ASCII\u7801\u503c\u4e3a 10
\n\u00a0\u00a0 \u00a0 \u00a0ASCII\u7801\u503c\u4ece 0~31 \u8fd932\u4e2a\u5b57\u7b26\u4e3a\u4e0d\u53ef\u6253\u5370\u5b57\u7b26，\u65e0\u6cd5\u6253\u5370\u5728\u5c4f\u5e55\u4e0a\u89c2\u5bdf \u00a0<\/p>\n

\u4e3e\u4f8b1：\u7528ASCII\u7f16\u7801\u6253\u5370\u5bf9\u5e94\u5b57\u7b26<\/p>\n

\u660e\u786e：\u4e00\u4e2a\u5b57\u7b26\u7684\u672c\u8d28\u5c31\u662f\u5b83\u7684ASCII\u7801\u503c\u00a0<\/span><\/p>\n

\/\/\u7528ASCII\u7f16\u7801\u6253\u5370\u5bf9\u5e94\u5b57\u7b26
\n#include <iostream><\/p>\n

using namespace std;<\/p>\n

int main()
\n{
\n\u00a0\u00a0 \u00a0char n = 65; \/\/A\u7684ASCII\u7f16\u7801\u4e3a 65\u00a0
\n\u00a0\u00a0 \u00a0cout << n << endl; \/\/\u5c4f\u5e55\u4e0a\u4f1a\u6253\u5370\u51fa A\u00a0
\n\u00a0\u00a0 \u00a0return 0;
\n}<\/p>\n

\u4e3e\u4f8b2：char\u7c7b\u578b\u53d8\u91cf\u53ea\u80fd\u63a5\u53d7\u5355\u4e2a<\/span>\u5b57\u7b26<\/p>\n

#include <iostream>
\nusing namespace std;<\/p>\n

int main()
\n{
\n\u00a0\u00a0 \u00a0char n;
\n\u00a0\u00a0 \u00a0cin >> n; \/\/ \u8f93\u5165 65 ，"65"\u5c5e\u4e8e\u4e24\u4e2a\u5b57\u7b26\u00a0
\n\u00a0\u00a0 \u00a0cout << n << endl; \/\/ \u8f93\u51fa 6 ，\u800c\u4e0d\u662f\u8f93\u51fa ASCII\u7f16\u780165 \u5bf9\u5e94\u7684\u5b57\u7b26 A\u00a0
\n\u00a0\u00a0 \u00a0\/\/ \u56e0\u4e3a char\u7c7b\u578b \u53d8\u91cfn \u53ea\u80fd\u63a5\u53d7\u7b2c\u4e00\u4e2a\u5b57\u7b26 '6',\u6240\u4ee5\u8f93\u51fa\u7ed3\u679c\u4e3a 6\u00a0
\n\u00a0\u00a0 \u00a0return 0;
\n}<\/p>\n

\u4e3e\u4f8b3：\u8f93\u5165\u6570\u5b57 65 \u5f97\u5230\u5b57\u7b26 'A'，\u9700\u5c06\u53d8\u91cf\u6539\u4e3aint<\/font>\u63a5\u6536\u6570\u5b57，\u518d\u5f3a\u5236\u8f6c\u6362<\/span>\u4e3achar<\/p>\n

#include <iostream>
\nusing namespace std; \u00a0 \/\/standard\u6807\u51c6\u00a0\u00a0<\/p>\n

int main()
\n{
\n\u00a0\u00a0 \u00a0int n;
\n\u00a0\u00a0 \u00a0cin >> n; \/\/ \u8f93\u5165 \u5b57\u7b26A \u7684 ASCII\u7f16\u780165 \u5e76\u7528 int\u7c7b\u578b\u5b58\u50a8\u00a0
\n\u00a0\u00a0 \u00a0char m = (char)n; \/\/\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u00a0
\n\u00a0\u00a0 \u00a0cout << m << endl; \/\/ \u8f93\u51fa\u5b57\u7b26A\u00a0
\n\u00a0\u00a0 \u00a0return 0;
\n}<\/p>\n

\/\/endl \u662f\u8f93\u51fa\u6d41\u7684\u64cd\u4f5c\u7b26，\u53ea\u80fd\u7528\u5728 cout \u540e\u9762，\u4e0d\u80fd\u7528 cin \u540e\u9762\u00a0<\/p>\n

\n（2）.\u6574\u578b\u7c7b\u578b（\u6574\u6570）<\/h4>\n

\u00a0
\n\u5728 C\u548cC++ \u4e2d\u88ab\u5206\u4e3a\u56db\u5927\u7c7b
\nshort \u77ed\u6574\u578b\u00a0
\nint \u6574\u578b\u00a0
\nlong \u957f\u6574\u578b\u00a0
\nlong long \u00a0\u66f4\u957f\u7684\u6574\u578b\u00a0<\/p>\n

#include <iostream>
\n#include <climits> \/\/ \u5305\u542b\u6574\u578b\u8303\u56f4\u7684\u5e38\u91cf\u5b9a\u4e49
\nusing namespace std;<\/p>\n

int main() {
\n\u00a0 \u00a0 \/\/ 1. \u67e5\u770b\u5404\u6574\u578b\u5360\u7528\u7684\u5b57\u8282\u6570（\u5185\u5b58\u5927\u5c0f）
\n\u00a0 \u00a0 cout << "short \u5360\u7528\u5b57\u8282\u6570：" << sizeof(short) << endl;
\n\u00a0 \u00a0 cout << "int \u00a0 \u5360\u7528\u5b57\u8282\u6570：" << sizeof(int) << endl;
\n\u00a0 \u00a0 cout << "long \u00a0\u5360\u7528\u5b57\u8282\u6570：" << sizeof(long) << endl;
\n\u00a0 \u00a0 cout << "long long \u5360\u7528\u5b57\u8282\u6570：" << sizeof(long long) << endl;<\/p>\n

\u00a0 \u00a0 \/\/ 2. \u67e5\u770b\u5404\u6574\u578b\u7684\u6570\u503c\u8303\u56f4
\n\u00a0 \u00a0 cout << "short \u8303\u56f4：" << SHRT_MIN << " ~ " << SHRT_MAX << endl;
\n\u00a0 \u00a0 cout << "int \u00a0 \u8303\u56f4：" << INT_MIN << " ~ " << INT_MAX << endl;
\n\u00a0 \u00a0 cout << "long \u00a0\u8303\u56f4：" << LONG_MIN << " ~ " << LONG_MAX << endl;
\n\u00a0 \u00a0 cout << "long long \u8303\u56f4：" << LLONG_MIN << " ~ " << LLONG_MAX << endl;<\/p>\n

\u00a0 \u00a0 return 0;
\n}<\/p>\n

\u8fd0\u884c\u7ed3\u679c：<\/p>\n

\"\"<\/p>\n

C\/C++ \u7684\u6807\u51c6\u89c4\u5b9a：sizeof(long) >= sizeof(int)<\/p>\n

\u6240\u4ee5sizeof(long) \u7684\u8ba1\u7b97\u7ed3\u679c\u53ef\u80fd\u662f\u00a04\u62168，\u53d6\u51b3\u4e8e\u7f16\u8bd1\u5668<\/p>\n

（3）.\u6d6e\u70b9\u578b（\u5c0f\u6570）\u00a0<\/h4>\n

\u5728 C\u548cC++ \u4e2d\u88ab\u5206\u4e3a\u4e09\u5927\u7c7b：
\nfloat \u5355\u7cbe\u5ea6\u6d6e\u70b9\u578b\u00a0
\ndouble \u53cc\u7cbe\u5ea6\u6d6e\u70b9\u578b\u00a0
\nlong double \u00a0\u957f\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u578b\u00a0<\/p>\n

flodt num = 5.5;\u00a0 \u00a0 \/\/ 5.5 \u4f1a\u88ab\u7f16\u8bd1\u5668\u8bc6\u522b\u4e3a double<\/span>\u7c7b\u578b
\nfloat num = 5.5f<\/span>;\u00a0 \u00a0\/\/ 5.5 \u4f1a\u88ab\u7f16\u8bd1\u5668\u8bc6\u522b\u4e3a float<\/span>\u7c7b\u578b<\/p>\n

C\/C++\u4e2d\u5c0f\u6570\u4e66\u5199\u5f62\u5f0f：
\n3.14\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u7f16\u8bd1\u5668\u9ed8\u8ba4\u8bc6\u522b\u4e3a double\u7c7b\u578b
\n3.14f\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u7f16\u8bd1\u5668\u9ed8\u8ba4\u8bc6\u522b\u4e3a float\u7c7b\u578b
\n1e5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u79d1\u5b66\u8ba1\u6570\u6cd5\u8868\u793a\u5f62\u5f0f，\u88681.0*10^5
\n1e5+10\u00a0 \u00a0 \u00a0 \u00a0 100010
\n1.23e5+10\u00a0 \u00a0123010<\/p>\n

（4）.\u5e03\u5c14\u7c7b\u578b（bool）<\/h4>\n

\n\u5e03\u5c14\u7c7b\u578b\u53d8\u91cf\u7684\u503c\u4e3a true \u6216 false，\u7528\u4e8e\u8868\u793a\u771f\u6216\u5047
\n\u5728C\/C++\u4e2d，0\u8868\u793a\u5047，\u975e0\u8868\u793a\u771f<\/p>\n

bool flag = true;<\/p>\n

\u4e8c\u3001signed \u548c unsigned<\/h3>\n<\/p>\n

signed（\u6709\u7b26\u53f7\u7684） \u548c unsigned（\u65e0\u7b26\u53f7\u7684） \u5173\u952e\u5b57\u7528\u4e8e\u4fee\u9970\u5b57\u7b26\u578b\u548c\u6574\u578b\u7c7b\u578b<\/p>\n

signed \u8868\u793a\u4e00\u4e2a\u7c7b\u578b\u5e26\u6709\u6b63\u8d1f\u53f7，\u5305\u542b\u8d1f\u503c
\nunsigned \u8868\u793a\u4e00\u4e2a\u7c7b\u578b\u4e0d\u5e26\u6709\u6b63\u8d1f\u53f7，\u53ea\u80fd\u8868\u793a0\u548c\u6b63\u6574\u6570<\/p>\n

int n;
\nsigned int n;
\nunsigned int n;<\/p>\n

\u5bf9\u4e8e \u6574\u578b\u7c7b\u578b<\/span> \u9ed8\u8ba4\u5e26\u6709\u6b63\u8d1f\u53f7，\u5176signed\u53ef\u4ee5\u7701\u7565，\u5982 int == signed int
\n\u4f46\u662f char\u7c7b\u578b<\/span> \u7684\u7b26\u53f7\u6027\u53d6\u51b3\u4e8e\u7f16\u8bd1\u5668，\u5373 char \u4e0d\u4e00\u5b9a\u7b49\u4e8e signed char
\n\u5e38\u89c1\u7f16\u8bd1\u5668\u4e2d，char == signed char\u00a0<\/p>\n

\u5c06\u53d8\u91cf\u58f0\u660e\u4e3a unsigned<\/span>，\u540c\u6837\u957f\u5ea6\u7684\u5185\u5b58\u80fd\u591f\u8868\u793a\u7684\u6700\u5927\u6574\u6570\u503c \u589e\u5927\u4e00\u500d<\/span>\u00a0<\/p>\n<\/p>\n

\/\/\u6ce8\u610f unsigned\u7684\u4f7f\u7528 \u5bf9\u8f93\u5165\u6570\u636e\u7684\u5b58\u50a8\u9020\u6210\u7684\u5f71\u54cd<\/p>\n

#include <iostream>
\nusing namespace std;<\/p>\n

int main()
\n{
\n\u00a0\u00a0 \u00a0unsigned int num = 10;
\n\u00a0\u00a0 \u00a0cout << num << endl; \/\/\u8f93\u51fa10\u00a0
\n\u00a0\u00a0 \u00a0cin >> num; \/\/\u8f93\u5165 -5\u00a0
\n\u00a0\u00a0 \u00a0cout << num << endl; \/\/\u8f93\u51fa4294967291
\n\u00a0\u00a0 \u00a0return 0;
\n\u00a0}<\/p>\n

\u00a0<\/p>\n

\u4e09\u3001\u6570\u636e\u7c7b\u578b\u957f\u5ea6<\/h3>\n

\n（1）. sizeof \u64cd\u4f5c\u7b26<\/h4>\n

\nsizeof \u662f\u4e00\u4e2a\u5173\u952e\u5b57，\u4e5f\u662f\u64cd\u4f5c\u7b26，\u4e13\u95e8\u7528\u4e8e\u8ba1\u7b97\u7279\u5b9a\u6570\u636e\u7c7b\u578b\u7684\u957f\u5ea6，\u5355\u4f4d\u662f\u5b57\u8282<\/span>
\nsizeof\u64cd\u4f5c\u7b26\u7684 \u64cd\u4f5c\u6570\u53ef\u4ee5\u662f\u7c7b\u578b，\u4e5f\u53ef\u4ee5\u662f\u53d8\u91cf\u540d\u6216\u8868\u8fbe\u5f0f<\/p>\n

\u7528\u6cd5：sizeof（\u64cd\u4f5c\u6570）\u00a0<\/p>\n

\u5f53\u64cd\u4f5c\u6570\u4e0d\u662f\u7c7b\u578b，\u62ec\u53f7\u53ef\u4ee5\u7701\u7565\u00a0<\/p>\n

\n\u5176\u8ba1\u7b97\u7ed3\u679c\u4e3a size_t \u7c7b\u578b，\u4e3a\u65e0\u7b26\u53f7\u6574\u6570\u00a0<\/p>\n

sizeof(char) –> 1\u5b57\u8282\u00a0
\nsizeof(bool) –> 1\u5b57\u8282\u00a0\u00a0
\nsizeof(float) –> 4\u5b57\u8282\u00a0
\nsizeof(double) –> 8\u5b57\u8282\u00a0
\nsizeof(long double) –> 16\u5b57\u8282<\/p>\n

\u6570\u636e\u7c7b\u578b\u7684\u957f\u5ea6\u51b3\u5b9a\u4e86 \u7531\u8fd9\u4e2a\u6570\u636e\u7c7b\u578b\u5b9a\u4e49\u51fa\u6765\u7684\u53d8\u91cf\u80fd\u591f\u5b58\u50a8\u7684\u6570\u503c\u7684\u5927\u5c0f<\/p>\n

（2）.\u5404\u7c7b\u578b\u53d6\u503c\u8303\u56f4（\u91cd\u8981）<\/span><\/h4>\n

\u6574\u578b\u7c7b\u578b：<\/span><\/p>\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\n\u540d\u79f0<\/td>\n\u5185\u5b58\u5360\u7528<\/td>\n\u6570\u503c\u8303\u56f4（\u4ee5\u5e38\u89c1\u7684 64 \u4f4d\u7cfb\u7edf\u4e3a\u4f8b）<\/td>\n<\/tr>\n
short<\/td>\n\u77ed\u6574\u578b<\/td>\n2\u5b57\u8282<\/td>\n-2\u00b9\u2075 ~ 2\u00b9\u2075 -1（\u5927\u7ea6\u4e3a\u00b110\u2074）<\/td>\n<\/tr>\n
int<\/td>\n\u6574\u578b<\/td>\n4\u5b57\u8282<\/td>\n-2\u00b3\u00b9 ~ 2\u00b3\u00b9 -1（\u5927\u7ea6\u4e3a\u00b110\u2079）<\/td>\n<\/tr>\n
unsigned int<\/td>\n\u65e0\u7b26\u53f7\u6574\u578b<\/td>\n4\u5b57\u8282<\/td>\n0 ~ 2\u00b3\u00b2 -1<\/td>\n<\/tr>\n
long<\/td>\n\u957f\u6574\u578b<\/td>\n4\/8\u5b57\u8282<\/td>\n-2\u00b3\u00b9 ~ 2\u00b3\u00b9 -1（\u5927\u7ea6\u4e3a\u00b110\u2079）\u00a0\/ -2\u2076\u00b3 ~ 2\u2076\u00b3 -1（\u5927\u7ea6\u4e3a\u00b110\u00b9\u2078）<\/td>\n<\/tr>\n
long long<\/td>\n\u66f4\u957f\u7684\u6574\u578b<\/td>\n8\u5b57\u8282<\/td>\n\n

-2\u2076\u00b3 ~ 2\u2076\u00b3 -1（\u5927\u7ea6\u4e3a\u00b110\u00b9\u2078）<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/h4>\n

<\/h4>\n

<\/h4>\n

<\/h4>\n

<\/h4>\n

<\/h4>\n

C\/C++ \u7684\u6807\u51c6\u89c4\u5b9a：sizeof(long) >= sizeof(int)<\/p>\n

\u6240\u4ee5sizeof(long) \u7684\u8ba1\u7b97\u7ed3\u679c\u53ef\u80fd\u662f\u00a04\u62168，\u53d6\u51b3\u4e8e\u7f16\u8bd1\u5668<\/p>\n

\u6d6e\u70b9\u6570\u7c7b\u578b：<\/p>\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\n\u540d\u79f0<\/td>\n\u5185\u5b58\u5360\u7528<\/td>\n\u6570\u503c\u8303\u56f4（\u4ee5\u5e38\u89c1\u7684 64 \u4f4d\u7cfb\u7edf\u4e3a\u4f8b）<\/td>\n<\/tr>\n
float<\/td>\n\u5355\u7cbe\u5ea6\u6d6e\u70b9\u578b<\/td>\n4\u5b57\u8282<\/td>\n\n

\u7cbe\u5ea6：6~7 \u4f4d<\/p>\n

\u6709\u6548\u6570\u5b57\u8303\u56f4：\u00b110\u207b\u00b3\u2078\u00a0~ \u00b110\u00b3\u2078<\/p>\n<\/td>\n<\/tr>\n

double<\/span><\/td>\n\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u578b<\/td>\n8\u5b57\u8282<\/td>\n\n

\u7cbe\u5ea6：15~17 \u4f4d<\/p>\n

\u6709\u6548\u6570\u5b57\u8303\u56f4：\u00b110\u207b\u00b3\u2070\u2078~ \u00b110\u00b3\u2070\u2078<\/p>\n<\/td>\n<\/tr>\n

long double<\/td>\n\u957f\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u578b<\/td>\n8\/16\u5b57\u8282<\/td>\n\n

\u7cbe\u5ea6：\u81f3\u5c11 15 \u4f4d\u6709\u6548\u6570\u5b57（16 \u5b57\u8282\u7248\u672c\u53ef\u8fbe 18~19 \u4f4d）<\/p>\n

\u8303\u56f4：\u00b110\u207b\u2074\u2079\u00b3\u00b2 ~ \u00b110\u2074\u2079\u00b3\u00b2（16 \u5b57\u8282\u7248\u672c）<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \n
  • \n

    \u201c\u6709\u6548\u6570\u5b57\u201d \u662f\u6838\u5fc3：\u6d6e\u70b9\u6570\u7684 \u201c\u7cbe\u5ea6\u201d \u4e0d\u662f \u201c\u5c0f\u6570\u4f4d\u6570\u201d，\u800c\u662f\u5168\u90e8\u6570\u5b57\u7684\u4f4d\u6570（\u6bd4\u5982float\u7684123456.789\u53ea\u80fd\u7cbe\u786e\u5230123456，\u540e\u51e0\u4f4d\u662f\u8fd1\u4f3c\u503c）；<\/p>\n<\/li>\n

  • \n

    \u5185\u5b58\u4e0e\u8303\u56f4 \/ \u7cbe\u5ea6\u7684\u5173\u7cfb：\u5185\u5b58\u8d8a\u5927，\u7cbe\u5ea6\u8d8a\u9ad8\u3001\u8868\u793a\u7684\u6570\u503c\u8303\u56f4\u8d8a\u5e7f（double\u662f\u65e5\u5e38\u6700\u5e38\u7528\u7684，\u7cbe\u5ea6\u548c\u8303\u56f4\u8fdc\u4f18\u4e8efloat）；<\/p>\n<\/li>\n

  • \n

    long double \u7684\u7279\u6b8a\u6027：64 \u4f4d\u7cfb\u7edf\u4e2d，Windows \u901a\u5e38\u548cdouble\u4e00\u6837\u5360 8 \u5b57\u8282，Linux\/macOS \u591a\u4e3a 16 \u5b57\u8282，\u65b0\u624b\u65e5\u5e38\u7528double\u5373\u53ef，\u65e0\u9700\u523b\u610f\u7528long double；<\/p>\n<\/li>\n

  • \n

    \u65e0\u7b26\u53f7\u6d6e\u70b9\u6570：C\/C++ \u4e2d\u6d6e\u70b9\u6570\u6ca1\u6709 unsigned \u7248\u672c，\u9ed8\u8ba4\u90fd\u80fd\u8868\u793a\u6b63\u8d1f\u503c<\/p>\n<\/li>\n<\/ul>\n

    （3）.typeof \u5173\u952e\u5b57<\/h4>\n

    \n\u7528\u9014：\u7ed9\u7c7b\u578b\u91cd\u547d\u540d，\u7b80\u5316\u7c7b\u578b
    \n\u7528\u6cd5：typedef \u539f\u7c7b\u578b\u540d \u65b0\u7c7b\u578b\u540d；\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

    Chapter 2：\u6570\u636e\u7c7b\u578b\u4e00\u3001\u6570\u636e\u7c7b\u578b\u7c7b\u578b，\u662f\u76f8\u4f3c\u7684\u6570\u636e\u6240\u636e\u62e5\u6709\u7684\u5171\u540c\u7279\u5f81
    \nC\u5185\u7b80\u5355\u6570\u636e\u7c7b\u578b：\u5b57\u7b26\u578b，\u6574\u578b，\u6d6e\u70b9\u578b，\u5e03\u5c14\u7c7b\u578b（1）.\u5b57\u7b26\u578b char\u00a0a.\u7528\u5355\u5f15\u53f7\u8868\u793a\u5b57\u7b26，\u7528\u53cc\u5f15\u53f7\\”\\”\u8868\u793a\u5b57\u7b26\u4e32
    \nb.ASCII\u7f16\u7801
    \n\u8ba1\u7b97\u673a\u4e2d\u6240\u6709\u6570\u636e（\u5305\u62ec\u5b57\u7b26）\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u5b58\u50a8，\u800cASCII\u7801\u8868\u4e2d\u8bb0\u5f55\u7684\u5c31\u662f\u6bcf\u4e2a\u5b57\u7b26\u7684\u5bf9\u5e94\u7f16\u7801<\/p>\n","protected":false},"author":2,"featured_media":70271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7373,7374,7372,55,174,427,729],"topic":[],"class_list":{"0":"post-70273","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-server","8":"tag-acm","9":"tag-7374","10":"tag-7372","11":"tag-c","13":"tag-427","14":"tag-729"},"yoast_head":"\n\u7b97\u6cd5\u7ade\u8d5bC\/C++\uff1a\u6570\u636e\u7c7b\u578b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/70273.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7b97\u6cd5\u7ade\u8d5bC\/C++\uff1a\u6570\u636e\u7c7b\u578b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"Chapter 2：\u6570\u636e\u7c7b\u578b\u4e00\u3001\u6570\u636e\u7c7b\u578b\u7c7b\u578b，\u662f\u76f8\u4f3c\u7684\u6570\u636e\u6240\u636e\u62e5\u6709\u7684\u5171\u540c\u7279\u5f81 C\u5185\u7b80\u5355\u6570\u636e\u7c7b\u578b：\u5b57\u7b26\u578b，\u6574\u578b，\u6d6e\u70b9\u578b，\u5e03\u5c14\u7c7b\u578b（1）.\u5b57\u7b26\u578b char\u00a0a.\u7528\u5355\u5f15\u53f7\u8868\u793a\u5b57\u7b26，\u7528\u53cc\u5f15\u53f7""\u8868\u793a\u5b57\u7b26\u4e32 b.ASCII\u7f16\u7801 \u8ba1\u7b97\u673a\u4e2d\u6240\u6709\u6570\u636e（\u5305\u62ec\u5b57\u7b26）\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u5b58\u50a8，\u800cASCII\u7801\u8868\u4e2d\u8bb0\u5f55\u7684\u5c31\u662f\u6bcf\u4e2a\u5b57\u7b26\u7684\u5bf9\u5e94\u7f16\u7801\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/70273.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-01T10:49:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201104913-697f2fa99e72a.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/70273.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/70273.html\",\"name\":\"\u7b97\u6cd5\u7ade\u8d5bC\/C++\uff1a\u6570\u636e\u7c7b\u578b - 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\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/70273.html","og_locale":"zh_CN","og_type":"article","og_title":"\u7b97\u6cd5\u7ade\u8d5bC\/C++\uff1a\u6570\u636e\u7c7b\u578b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"Chapter 2：\u6570\u636e\u7c7b\u578b\u4e00\u3001\u6570\u636e\u7c7b\u578b\u7c7b\u578b，\u662f\u76f8\u4f3c\u7684\u6570\u636e\u6240\u636e\u62e5\u6709\u7684\u5171\u540c\u7279\u5f81 C\u5185\u7b80\u5355\u6570\u636e\u7c7b\u578b：\u5b57\u7b26\u578b，\u6574\u578b，\u6d6e\u70b9\u578b，\u5e03\u5c14\u7c7b\u578b（1）.\u5b57\u7b26\u578b char\u00a0a.\u7528\u5355\u5f15\u53f7\u8868\u793a\u5b57\u7b26，\u7528\u53cc\u5f15\u53f7\"\"\u8868\u793a\u5b57\u7b26\u4e32 b.ASCII\u7f16\u7801 \u8ba1\u7b97\u673a\u4e2d\u6240\u6709\u6570\u636e（\u5305\u62ec\u5b57\u7b26）\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u5b58\u50a8，\u800cASCII\u7801\u8868\u4e2d\u8bb0\u5f55\u7684\u5c31\u662f\u6bcf\u4e2a\u5b57\u7b26\u7684\u5bf9\u5e94\u7f16\u7801","og_url":"https:\/\/www.wsisp.com\/helps\/70273.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-02-01T10:49:15+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260201104913-697f2fa99e72a.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"3 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/70273.html","url":"https:\/\/www.wsisp.com\/helps\/70273.html","name":"\u7b97\u6cd5\u7ade\u8d5bC\/C++\uff1a\u6570\u636e\u7c7b\u578b - 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