{"id":231,"date":"2023-08-18T18:04:52","date_gmt":"2023-08-18T10:04:52","guid":{"rendered":"http:\/\/blog.xjfvps.top\/index.php\/2023\/08\/18\/%e3%80%8ac%e5%a4%a7%e5%ad%a6%e6%95%99%e7%a8%8b%e3%80%8b%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0-%e7%ac%ac%e5%8d%81%e5%85%ad%e7%ab%a0%ef%bc%88%e4%bd%8d%e3%80%81%e5%ad%97%e7%ac%a6%e3%80%81%e5%ad%97\/"},"modified":"2023-08-18T21:25:31","modified_gmt":"2023-08-18T13:25:31","slug":"%e3%80%8ac%e5%a4%a7%e5%ad%a6%e6%95%99%e7%a8%8b%e3%80%8b%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0-%e7%ac%ac%e5%8d%81%e5%85%ad%e7%ab%a0%ef%bc%88%e4%bd%8d%e3%80%81%e5%ad%97%e7%ac%a6%e3%80%81%e5%ad%97","status":"publish","type":"post","link":"https:\/\/blog.fs.cloudns.biz\/index.php\/2023\/08\/18\/%e3%80%8ac%e5%a4%a7%e5%ad%a6%e6%95%99%e7%a8%8b%e3%80%8b%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0-%e7%ac%ac%e5%8d%81%e5%85%ad%e7%ab%a0%ef%bc%88%e4%bd%8d%e3%80%81%e5%ad%97%e7%ac%a6%e3%80%81%e5%ad%97\/","title":{"rendered":"\u300aC++\u5927\u5b66\u6559\u7a0b\u300b\u8bfb\u4e66\u7b14\u8bb0 \u7b2c\u5341\u516d\u7ae0\uff08\u4f4d\u3001\u5b57\u7b26\u3001\u5b57\u7b26\u4e32\u548c\u7ed3\u6784\uff09"},"content":{"rendered":"

 
\n

\u7ed3\u6784\u7684\u4e00\u4e9b\u57fa\u672c\u6982\u5ff5\uff1a<\/SPAN><\/B><\/B><\/P>
\n

 <\/SPAN><\/P>
\n

\u7ed3\u6784\u4e0d\u80fd\u6bd4\u8f83\uff0c\u56e0\u4e3a\u5728\u5185\u5b58\u4e2d\u4ed6\u4eec\u7684\u6210\u5458\u4e0d\u4e00\u5b9a\u662f\u8fde\u7eed\u653e\u7f6e\u3002<\/SPAN><\/P>
\n

\u7ed3\u6784\u9700\u6309\u987a\u5e8f\u521d\u59cb\u5316\u3002<\/SPAN><\/P>
\n

\u7ed3\u6784\u4f5c\u4e3a\u53c2\u6570\u65f6\u4e00\u822c\u662f\u6309\u503c\u4f20\u9012\uff0c\u4e5f\u53ef\u4ee5\u4f5c\u6307\u9488\u6216\u5f15\u7528\u4f20\u9012\u3002<\/SPAN><\/P>
\n

 <\/SPAN><\/P>
\n

\u4f4d\u8fd0\u7b97<\/SPAN><\/B><\/B><\/P>
\n

&  <\/SPAN>\u6309\u4f4d\u4e0e<\/SPAN><\/P>
\n

|   <\/SPAN>\u6309\u4f4d\u6216<\/SPAN><\/P>
\n

^   <\/SPAN>\u6309\u4f4d\u5f02\u6216<\/SPAN><\/P>
\n

<<  <\/SPAN>\u5de6\u79fb\u4f4d<\/SPAN><\/P>
\n

>>  <\/SPAN>\u53f3\u79fb\u4f4d<\/SPAN><\/P>
\n

~   <\/SPAN>\u6c42\u53cd<\/SPAN><\/P>
\n

 <\/SPAN><\/P>
\n

\u6309\u4f4d\u4e0e\u901a\u5e38\u4e0e\u4e00\u4e2a\u5c4f\u853d\u5b57\uff08<\/SPAN>mark<\/SPAN>\uff09\u4e00\u8d77\u4f7f\u7528\uff0c\u5c4f\u853d\u5b57\u5c31\u662f\u67d0\u4e00\u4f4d\u4e3a<\/SPAN>1<\/SPAN>\u7684\u6570\uff08\u5176\u4ed6\u4f4d\u4e3a<\/SPAN>0<\/SPAN>\uff09\u3002\u4e00\u4e2a\u6574\u6570\u4e0e\u8fd9\u4e2a\u5c4f\u853d\u5b57\u5219\u9664\u4e86\u4e3a<\/SPAN>1<\/SPAN>\u7684\u90a3\u4f4d\u5916\uff0c\u5176\u4ed6\u4f4d\u90fd\u88ab“\u5c4f\u853d”\u6389\u4e86\u3002\u4e13\u95e8\u6d4b\u8bd5\u4e00\u4e2a\u6570\u7684\u67d0\u4e00\u4f4d\u662f\u5426\u4e3a<\/SPAN>1<\/SPAN>\u3002<\/SPAN><\/P>
\n

 <\/SPAN><\/P>
\n

\u5229\u7528\u8fd9\u70b9\u53ef\u4ee5\u5199\u51fa\u4e00\u79cd\u663e\u793a\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u6570\u503c\u7684\u65b9\u6cd5\uff1a<\/SPAN><\/P>
\n

void<\/SPAN> displayBits(unsigned x)
{
    unsigned m,i=1<<15;

    <\/SPAN>for<\/SPAN>(m=1; m<=16; m++)
    {
        cout<<(x & i ? ‘1’:’0′);
        x<<=1;

        <\/SPAN>if<\/SPAN>(m%8==0)
            cout<<‘ ‘;
    }
    cout<<endl;
}<\/SPAN><\/P>
\n

   <\/P>
\n

\u4f4d\u6bb5\uff08\u4f4d\u57df\uff09<\/SPAN><\/P>
\n

   <\/SPAN><\/SPAN>\u5bf9\u4e8e\u7ed3\u6784\u6216\u7c7b\u4e2d\u7684<\/SPAN>unsigned<\/SPAN>\u7c7b\u578b\u548c<\/SPAN>int<\/SPAN>\u7c7b\u578b\u7684\u6210\u5458\uff0c<\/SPAN>C<\/SPAN>\u8bed\u8a00\u5141\u8bb8\u6307\u5b9a\u5b58\u50a8\u4ed6\u4eec\u7684\u4f4d\u6570\uff0c\u6307\u5b9a\u4e86\u5b58\u50a8\u4f4d\u6570\u7684\u8fd9\u4e9b\u7ed3\u6784\u7684\u6210\u5458\u6216\u5c31\u662f\u4f4d\u57df\uff08\u4f4d\u6bb5\uff09\u3002<\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

struct BitCard<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

   <\/SPAN>unsigned face:4;     <\/SPAN><\/SPAN>\u6307\u5b9a\u4e86<\/SPAN>4<\/SPAN>\u4f4d\uff0c\u53ef\u8868\u793a\u8303\u56f4<\/SPAN>0000~1111   <\/SPAN>2^4=16<\/o:p><\/SPAN><\/P>
\n

   <\/SPAN>unsigned suit:2;     <\/SPAN><\/SPAN>\u6307\u5b9a\u4e86<\/SPAN>2<\/SPAN>\u4f4d\uff0c\u8303\u56f4<\/SPAN> 00~11       <\/SPAN>2^2=4<\/o:p><\/SPAN><\/P>
\n

   <\/SPAN>unsigned color:1     <\/SPAN><\/SPAN>\u6307\u5b9a\u4e86<\/SPAN>1<\/SPAN>\u4f4d\uff0c\u8303\u56f4<\/SPAN> 0~1<\/o:p><\/SPAN><\/P>
\n

}<\/SPAN><\/o:p><\/SPAN><\/P>
\n

\u8fd9\u6574\u4e2a\u7ed3\u6784\u5176\u5b9e\u53ea\u662f\u4e00\u4e2a<\/SPAN>unsigned<\/SPAN>\u5b57\u8282\uff08\u5728<\/SPAN>32<\/SPAN>\u4f4d\u673a\u4e0a\u662f<\/SPAN>4<\/SPAN>\u4e2a\u5b57\u8282\uff09

  <\/P>
\n

\u6709\u4e2a\u95ee\u9898\uff0c\u8d85\u8fc7\u4e86\u6307\u5b9a\u4f4d\uff0c\u600e\u4e48\u529e\uff1f\u7a0b\u5e8f\u4f1a\u6709\u4ec0\u4e48\u884c\u4e3a\uff1f\u9a8c\u8bc1\u4e4b<\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

struct exam<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>unsigned a : 2;<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>unsigned b : 6;<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>unsigned c : 4;<\/o:p><\/SPAN><\/P>
\n

<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int main()<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>struct exam rt;<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>memset(&rt,0,sizeof(rt));<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>rt.a=31;<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>cout<<“size=”<<sizeof(rt)<<‘n’;<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>cout<<rt.a<<‘ ,'<<rt.b;<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN><\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>return 0;<\/o:p><\/SPAN><\/P>
\n

}<\/o:p><\/SPAN><\/P>
\n

\u7ed3\u679c\u663e\u793a\uff1a<\/SPAN><\/P>
\n

size=4<\/SPAN><\/P>
\n

3 ,0<\/SPAN><\/P>
\n

\u5176\u5b9e<\/SPAN>a<\/SPAN>\u5b58\u50a8\u4e86<\/SPAN>31<\/SPAN>\uff08<\/SPAN>11111<\/SPAN>\uff09\u7684\u6700\u540e\u4e24\u4f4d\u3002\u5e76\u4e14\uff0c\u591a\u51fa\u7684\u4f4d\u6570\u5e76\u672a\u5360<\/SPAN>b<\/SPAN>\u53d8\u91cf\uff0c\u800c\u662f\u7ed9\u622a\u65ad\u4e86\u3002\u5404\u4f4d\u57df\u95f4\u663e\u793a\u51fa\u5355\u72ec\u6027\u3002<\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u4f4d\u57df\u4e0d\u80fd\u53bb\u5730\u5740<\/SPAN> &.<\/o:p><\/SPAN><\/P>
\n

\u5c3d\u7ba1\u4f7f\u7528\u4f4d\u57df\u80fd\u591f\u8282\u7701\u5185\u5b58\uff0c\u4f46\u662f\u4f1a\u4f7f\u7f16\u8bd1\u5668\u4ea7\u751f\u6267\u884c\u901f\u5ea6\u53d8\u6162\u7684\u673a\u5668\u4ee3\u7801\u3002

  <\/P>
\n

\u5b57\u7b26\u5904\u7406\u51fd\u6570<\/SPAN><\/B><\/o:p><\/SPAN><\/B><\/P>
\n

int isdigit(int c)  <\/SPAN><\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u6570\u5b57\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int isalpha(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u5b57\u6bcd\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int isalnum(int c)  <\/SPAN><\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int isxdigit(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u5341\u516d\u8fdb\u5236\u5b57\u7b26\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int islower(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u5c0f\u5199\u5b57\u6bcd\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int isupper(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u5927\u5199\u5b57\u6bcd\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int tolower(int c) <\/SPAN>\u8fd4\u56de\u5176\u5c0f\u5199\u5b57\u6bcd<\/SPAN><\/o:p><\/SPAN><\/P>
\n

int toupper(int c) <\/SPAN>\u8fd4\u56de\u5176\u5927\u5199\u5b57\u6bcd<\/SPAN><\/o:p><\/SPAN><\/P>
\n

int isspace(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u7a7a\u767d\u7b26\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/SPAN>\u3002\u7a7a\u767d\u7b26\u5305\u62ec\uff1a<\/SPAN>’n’, <\/SPAN>\u7a7a\u683c\uff0c<\/SPAN>’t’ , ‘r’ ,<\/SPAN>\u8fdb\u7eb8\u7b26\uff08<\/SPAN>’f’<\/SPAN>\uff09<\/SPAN>,<\/SPAN>\u5782\u76f4\u5236\u8868\u7b26<\/SPAN>(‘v’)<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int iscntrl(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u63a7\u5236\u7b26\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

int ispunct(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u9664\u7a7a\u683c\u3001\u6570\u5b57\u548c\u5b57\u6bcd\u5916\u7684\u53ef\u6253\u5370\u5b57\u7b26\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int isprint(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u4e00\u4e2a\u53ef\u6253\u5370\u7b26\uff08\u5305\u62ec\u7a7a\u683c\uff09\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int isgraph(int c) <\/SPAN>\u5982\u679c<\/SPAN>c<\/SPAN>\u662f\u9664\u7a7a\u683c\u4e4b\u5916\u7684\u53ef\u6253\u5370\u5b57\u7b26\uff0c\u8fd4\u56de<\/SPAN>true<\/SPAN>\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>false<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

     <\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u5b57\u7b26\u4e32\u8f6c\u6362\u51fd\u6570<\/SPAN><\/B><\/o:p><\/SPAN><\/B><\/P>
\n

 <\/SPAN>double atof(const char *nPtr)   <\/SPAN><\/SPAN>\u628a\u5b57\u7b26\u4e32<\/SPAN>nPtr<\/SPAN>\u8f6c\u6362\u4e3a<\/SPAN>double<\/SPAN>\u7c7b\u578b<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/SPAN>int atoi(const char* nPtr)       <\/SPAN><\/SPAN>\u628a\u5b57\u7b26\u4e32<\/SPAN>nPtr<\/SPAN>\u8f6c\u6362\u4e3a<\/SPAN>int<\/SPAN>\u7c7b\u578b<\/SPAN><\/o:p><\/SPAN><\/P>
\n

long atol(const char *nPtr)     <\/SPAN>  <\/SPAN><\/SPAN>\u628a\u5b57\u7b26\u4e32<\/SPAN>nPtr<\/SPAN>\u8f6c\u6362\u4e3a<\/SPAN>long<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

double strtod(const char* nPtr,char **endPtr)<\/o:p><\/SPAN><\/P>
\n

\u628a\u5b57\u7b26\u4e32<\/SPAN>nPtr<\/SPAN>\u8f6c\u6362\u4e3a<\/SPAN>double<\/SPAN>\u7c7b\u578b\uff0c<\/SPAN>endPtr<\/SPAN>\u63a5\u6536<\/SPAN>nPtr<\/SPAN>\u4e2d\u975e\u6570\u5b57\u7684\u90e8\u5206<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

long strtol(const char *nPtr,char** endPtr, int base)<\/o:p><\/SPAN><\/P>
\n

\u628a\u5b57\u7b26\u4e32<\/SPAN>nPtr<\/SPAN>\u8f6c\u6362\u4e3a<\/SPAN>long<\/SPAN>\u7c7b\u578b\uff0c<\/SPAN>endPtr<\/SPAN>\u63a5\u6536<\/SPAN>nPtr<\/SPAN>\u4e2d\u9047\u5230\u7684\u7b2c\u4e00\u4e2a\u975e\u6570\u5b57\u5230\u7ed3\u5c3e\u7684\u90e8\u5206\uff0c<\/SPAN>base<\/SPAN>\u662f\u5f85\u8f6c\u6362\u5b57\u7b26\u4e32\u4e2d\u6570\u503c\u7684\u8fdb\u5236\u7c7b\u578b\uff0c<\/SPAN>0<\/SPAN>\u8868\u793a\u53ef\u4ee5\u662f\uff08<\/SPAN>8<\/SPAN>\u3001<\/SPAN>10<\/SPAN>\u3001<\/SPAN>16<\/SPAN>\uff09\u3002\u4e5f\u53ef\u662f<\/SPAN>2<\/SPAN>\uff5e<\/SPAN>36<\/SPAN>\u4e2d\u4efb\u4f55\u503c\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

unsigned long strtoul(const char* nPtr,char **endPtr, int base)<\/o:p><\/SPAN><\/P>
\n

\u628a\u5b57\u7b26\u4e32<\/SPAN>nPtr<\/SPAN>\u8f6c\u6362\u4e3a<\/SPAN>unsigned long<\/SPAN>\u7c7b\u578b\uff0c<\/SPAN>endPtr<\/SPAN>\u63a5\u6536<\/SPAN>nPtr<\/SPAN>\u4e2d\u9047\u5230\u7684\u7b2c\u4e00\u4e2a\u975e\u6570\u5b57\u5230\u7ed3\u5c3e\u7684\u90e8\u5206\uff0c<\/SPAN>base<\/SPAN>\u662f\u5f85\u8f6c\u6362\u5b57\u7b26\u4e32\u4e2d\u6570\u503c\u7684\u8fdb\u5236\u7c7b\u578b\uff0c<\/SPAN>0<\/SPAN>\u8868\u793a\u53ef\u4ee5\u662f\uff08<\/SPAN>8<\/SPAN>\u3001<\/SPAN>10<\/SPAN>\u3001<\/SPAN>16<\/SPAN>\uff09\u3002\u4e5f\u53ef\u662f<\/SPAN>2<\/SPAN>\uff5e<\/SPAN>36<\/SPAN>\u4e2d\u4efb\u4f55\u503c\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u5b57\u7b26\u4e32\u5904\u7406\u4e2d\u7684\u67e5\u627e\u51fd\u6570<\/SPAN><\/B><\/o:p><\/SPAN><\/B><\/P>
\n

char *strchr(const char *s,int c)<\/o:p><\/SPAN><\/P>
\n

\u67e5\u627e<\/SPAN>c<\/SPAN>\u5728<\/SPAN>s<\/SPAN>\u4e2d\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u6210\u529f\u5c06\u8fd4\u56de\u8be5\u4f4d\u7f6e\u7684\u6307\u9488\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>NULL<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

size_t strcspn(const char *s1,const char *s2)<\/o:p><\/SPAN><\/P>
\n

\u8ba1\u7b97\u5e76\u8fd4\u56de<\/SPAN>s1<\/SPAN>\u4e2d\u4e0d\u5305\u542b<\/SPAN>s2<\/SPAN>\u4e2d\u4efb\u4f55\u5b57\u7b26\u7684\u8d77\u59cb\u6bb5\u7684\u957f\u5ea6\u3002\u5373\u5728<\/SPAN>s1<\/SPAN>\u4e2d\u67e5\u627e\u662f\u5426\u6709<\/SPAN>s2<\/SPAN>\u7684\u5b57\u7b26\uff0c\u82e5\u78b0\u5230\u6709\u8be5\u5b57\u7b26\u5219\u8fd4\u56de\u4ece\u5f00\u59cb\uff08\u6570\u6570<\/SPAN>1<\/SPAN>\u5f00\u59cb\uff09\u5230\u8be5\u5b57\u7b26\u4e4b\u524d\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

size_t strspn(const char *s1,const char *s2)<\/o:p><\/SPAN><\/P>
\n

\u8ba1\u7b97\u5e76\u8fd4\u56de<\/SPAN>s1<\/SPAN>\u4e2d\u53ea\u5305\u542b<\/SPAN>s2<\/SPAN>\u4e2d\u5b57\u7b26\u7684\u8d77\u59cb\u6bb5\u957f\u5ea6\u3002\u5373\u5f53\u5728<\/SPAN>s1<\/SPAN>\u4e2d\u6ca1\u9047\u5230\u5728<\/SPAN>s2<\/SPAN>\u4e2d\u7684\u5b57\u7b26\u65f6\uff0c\u8fd4\u56de\u4ece\u5f00\u59cb\u5230\u8be5\u5b57\u7b26\u4e4b\u524d\u7684\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

char *strpbrk(const char *s1,const char *s2)<\/o:p><\/SPAN><\/P>
\n

\u5b9a\u4f4d\u5b57\u7b26\u4e32<\/SPAN>s1<\/SPAN>\u9996\u6b21\u51fa\u73b0\u5728\u5b57\u7b26\u4e32<\/SPAN>s2<\/SPAN>\u4e2d\u5b57\u7b26\u7684\u4f4d\u7f6e\u3002\u82e5\u627e\u5230\u4e86\u5b57\u7b26\u4e32<\/SPAN>s2<\/SPAN>\u4e2d\u7684\u5b57\u7b26\uff0c\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u5b57\u7b26\u4e32<\/SPAN>s1<\/SPAN>\u4e2d\u8be5\u5b57\u7b26\u7684\u6307\u9488\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>NULL<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

char *strrchr(const char *s,int c)<\/o:p><\/SPAN><\/P>
\n

\u8fd4\u56de<\/SPAN>c<\/SPAN>\u5728<\/SPAN>s<\/SPAN>\u4e2d\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u6307\u9488\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>NULL<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

char *strstr(const char *s1, const char *s2)<\/o:p><\/SPAN><\/P>
\n

\u8fd4\u56de<\/SPAN>s2<\/SPAN>\u5728<\/SPAN>s1<\/SPAN>\u4e2d\u9996\u6b21\u51fa\u73b0\uff08\u6574\u4e2a\u5b57\u7b26\u4e32\u5339\u914d\uff09\u7684\u4f4d\u7f6e\u6307\u9488\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>NULL<\/SPAN>\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u5b57\u7b26\u4e32\u5904\u7406\u5e93\u4e2d\u7684\u5185\u5b58\u51fd\u6570<\/SPAN><\/B><\/o:p><\/SPAN><\/B><\/P>
\n

void *memcpy(void *s1,const void *s2, size_t n)<\/o:p><\/SPAN><\/P>
\n

\u628a<\/SPAN>s2<\/SPAN>\u6240\u6307\u7684\u5bf9\u8c61\u4e2d\u7684<\/SPAN>n<\/SPAN>\u4e2a\u5b57\u7b26\u590d\u5236\u5230<\/SPAN>s1<\/SPAN>\u6240\u6307\u7684\u5bf9\u8c61\u4e2d\u3002\u8fd4\u56de<\/SPAN>s1<\/SPAN>\u7ed3\u679c\u6307\u9488\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

void *memmove(void *s1,const void *s2,size_t n)<\/o:p><\/SPAN><\/P>
\n

\u540c<\/SPAN>memcpy,<\/SPAN>\u5e76\u4e14\u591a\u8003\u8651\u4e86\u91cd\u53e0\u60c5\u51b5\uff08<\/SPAN>Overlapping Buffers<\/SPAN>\uff09<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int memcmp(const void *s1,const void *s2,size_t n)<\/o:p><\/SPAN><\/P>
\n

\u6bd4\u8f83<\/SPAN>s1<\/SPAN>\u548c<\/SPAN>s2<\/SPAN>\u6307\u5411\u5bf9\u8c61\u7684\u524d<\/SPAN>n<\/SPAN>\u4e2a\u5b57\u7b26\u3002\u5982\u679c<\/SPAN>s1<\/SPAN>\u6240\u6307\u5411\u5bf9\u8c61\u7684\u5b57\u7b26\u7b49\u4e8e\u3001\u5c0f\u4e8e\u6216\u5927\u4e8e<\/SPAN>s2<\/SPAN>\u6240\u6307\u5411\u5bf9\u8c61\u4e2d\u7684\u5b57\u7b26\uff0c\u8fd4\u56de\u503c\u5206\u522b\u7b49\u4e8e<\/SPAN>0<\/SPAN>\u3001<\/SPAN><0 <\/SPAN>\u3001<\/SPAN>>0<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

void *memchr(const char *s,int c,size_t n)<\/o:p><\/SPAN><\/P>
\n

\u5b9a\u4f4d<\/SPAN>s<\/SPAN>\u7684\u524d<\/SPAN>n<\/SPAN>\u4e2a\u5b57\u7b26\u9996\u6b21\u51fa\u73b0<\/SPAN>c<\/SPAN>\u7684\u4f4d\u7f6e\u3002\u627e\u5230\u5c31\u8fd4\u56de\u6307\u5411\u5b83\u7684\u6307\u9488\uff0c\u5426\u5219\u8fd4\u56de<\/SPAN>0<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

void *memset(void *s, int c,size_t n)<\/o:p><\/SPAN><\/P>
\n

\u628a<\/SPAN>c<\/SPAN>\u590d\u5236\u5230<\/SPAN>s<\/SPAN>\u6240\u6307\u7684\u5bf9\u8c61\u7684\u524d<\/SPAN>n<\/SPAN>\u4e2a\u5b57\u7b26\u4e2d\u3002\u8fd4\u56de\u6307\u5411\u7ed3\u679c\u6307\u9488\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

    <\/P>
\n

\u8fd9\u91cc<\/SPAN>memcpy<\/SPAN>\u548c<\/SPAN>memmove<\/SPAN>\u7684\u533a\u5206\u6709\u70b9\u7279\u522b\u3002\u4ece\u6e90\u7801\u770b\uff0c<\/SPAN>\u663e\u7136\uff0c<\/SPAN>memmove<\/SPAN>\u6bd4<\/SPAN>memcpy<\/SPAN>\u591a\u4e86\u5904\u7406\u91cd\u53e0\u7684\u60c5\u51b5\u3002\u4f46\u5f53\u6211\u4ece\u6807\u51c6\u5e93\u76f4\u63a5\u8c03\u7528<\/SPAN>memcpy<\/SPAN>\u7684\u65f6\u5019\uff0c\u53d1\u73b0\u5b83\u4e5f\u5982\u540c<\/SPAN>memmove<\/SPAN>\u4e00\u6837\u5904\u7406\u4e86\u91cd\u53e0\u7684\u60c5\u51b5\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

#include <stdio.h><\/o:p><\/SPAN><\/P>
\n

#include <string.h><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int main()<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>char x[]=”Home Sweet Home”;<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>if(x<&x[5])<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>memmove(&x[5],x,10);\/\/<\/SPAN>\u6b64\u5904\u6362\u6210<\/SPAN>memcpy<\/SPAN>\u7ed3\u679c\u4e00\u6837<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>printf(“%s”,x);<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>return 0;<\/o:p><\/SPAN><\/P>
\n

}<\/o:p><\/SPAN><\/P>
\n

\u7ed3\u679c\uff1a<\/SPAN><\/o:p><\/SPAN><\/P>
\n

Home Home Sweet<\/o:p><\/SPAN><\/P>
\n

\u65e0\u8bba\u662f\u7528<\/SPAN>vc <\/SPAN>\u8fd8\u662f<\/SPAN> gcc <\/SPAN>\u7ed3\u679c\u90fd\u662f\u8fd9\u6837\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u4f46\u662f\uff0c\u5982\u770b<\/SPAN>memcpy<\/SPAN>\u7684\u6e90\u7801\uff0c\u7ed3\u679c\u5e94\u8be5\u662f<\/SPAN>Home Home Home <\/SPAN>\u624d\u5bf9\u3002\u4e8e\u662f\u76f4\u63a5\u628a\u6e90\u7801<\/SPAN>copy<\/SPAN>\u8fc7\u6765\u7528\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

#include <stdio.h><\/o:p><\/SPAN><\/P>
\n

#include <string.h><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

void * __cdecl Memcpy (<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>void * dst,<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>const void * src,<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>size_t count<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>)<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>void * ret = dst;<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

#if defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC)<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>{<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>extern void RtlMoveMemory( void *, const void *, size_t count );<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>RtlMoveMemory( dst, src, count );<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>}<\/o:p><\/SPAN><\/P>
\n

#else  <\/SPAN>\/* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) *\/<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>\/*<\/o:p><\/SPAN><\/P>
\n

         <\/SPAN>* copy from lower addresses to higher addresses<\/o:p><\/SPAN><\/P>
\n

         <\/SPAN>*\/<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>while (count–) {<\/o:p><\/SPAN><\/P>
\n

                <\/SPAN>*(char *)dst = *(char *)src;<\/o:p><\/SPAN><\/P>
\n

                <\/SPAN>dst = (char *)dst + 1;<\/o:p><\/SPAN><\/P>
\n

                <\/SPAN>src = (char *)src + 1;<\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>}<\/o:p><\/SPAN><\/P>
\n

#endif  <\/SPAN>\/* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) *\/<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

        <\/SPAN>return(ret);<\/o:p><\/SPAN><\/P>
\n

}<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int main()<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>char x[]=”Home Sweet Home”;<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>if(x<&x[5])<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>Memcpy(&x[5],x,10);<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN>    <\/SPAN><\/SPAN>printf(“%s”,x);<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>return 0;<\/o:p><\/SPAN><\/P>
\n

}<\/o:p><\/SPAN><\/P>
\n

\u7ed3\u679c\uff1a<\/SPAN>Home Home Home<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u770b\u6765\uff0c\u6807\u51c6\u5e93\u91cc\u76f4\u63a5\u628a<\/SPAN>memcpy<\/SPAN>\u4f5c\u4e3a<\/SPAN>memmove<\/SPAN>\u4e86\u3002\u4e5f\u96be\u602a\uff0c\u5176\u5b9e\u4e24\u4e2a\u529f\u80fd\u51e0\u4e4e\u4e00\u6837\uff0c\u540e\u8005\u8fd8\u8003\u8651\u4e86\u5185\u5b58\u91cd\u53e0\u60c5\u51b5\uff0c\u4f7f\u7528\u53ef\u80fd\u66f4\u65b9\u4fbf\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/P>
\n

\u5176\u4ed6\u51fd\u6570<\/SPAN><\/B><\/o:p><\/SPAN><\/B><\/P>
\n

char *strerror(int errornum)<\/o:p><\/SPAN><\/P>
\n

\u5efa\u7acb\u4e0e<\/SPAN>errornum<\/SPAN>\u5339\u914d\u7684\u5b57\u7b26\u4e32\uff08\u4e0e\u7cfb\u7edf\u6709\u5173\uff09\uff0c\u8fd4\u56de\u6307\u5411\u8be5\u5b57\u7b26\u4e32\u7684\u6307\u9488\u3002<\/SPAN><\/o:p><\/SPAN><\/P>
\n

char *_strerror(char *errMsag)<\/o:p><\/SPAN><\/P>
\n

\u5728\u8f93\u51fa\u9519\u8bef\u4fe1\u606f\u524d\u5148\u6253\u5370\u51fa<\/SPAN>errMsag<\/SPAN>\u4fe1\u606f\uff0c\u4e5f\u53ef\u4ee5\u4e3a<\/SPAN>NULL<\/o:p><\/SPAN><\/P>
\n

void perror(const char *msg)<\/o:p><\/SPAN><\/P>
\n

\u628a\u76f8\u5173\u9519\u8bef\u4fe1\u606f\u5199\u5230<\/SPAN>stderr<\/SPAN>\u4e0a\uff0c\u5728\u6b64\u4e4b\u524d\u5148\u6253\u5370<\/SPAN>msg<\/SPAN>\u4fe1\u606f\uff0c\u5982\u679c\u4e3a<\/SPAN>NULL<\/SPAN>\u5219\u76f4\u63a5\u6253\u5370\u9519\u8bef\u4fe1\u606f\u3002\u6700\u540e\u81ea\u52a8\u6362\u884c<\/SPAN><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

#include <stdio.h><\/o:p><\/SPAN><\/P>
\n

#include <string.h><\/o:p><\/SPAN><\/P>
\n

#include <stdlib.h><\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

int main()<\/o:p><\/SPAN><\/P>
\n

{<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>FILE *fp;<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN><\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>if((fp=fopen(“tstc”,”r”)) == NULL)<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>{<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>  <\/SPAN> <\/SPAN>perror(“open file failed”);<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>  <\/SPAN> <\/SPAN>printf(strerror(errno));<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>  <\/SPAN> <\/SPAN>printf(“n”);<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>  <\/SPAN> <\/SPAN>printf(_strerror(“open failed”));<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>}<\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>  <\/SPAN>  <\/SPAN> <\/SPAN><\/o:p><\/SPAN><\/P>
\n

     <\/SPAN>return 0;<\/o:p><\/SPAN><\/P>
\n

}<\/o:p><\/SPAN><\/P>
\n

\u7ed3\u679c\uff1a<\/SPAN><\/o:p><\/SPAN><\/P>
\n

open file failed: No such file or directory<\/o:p><\/SPAN><\/P>
\n

No such file or directory<\/o:p><\/SPAN><\/P>
\n

open failed: No such file or directory<\/o:p><\/SPAN><\/P>
\n

 <\/o:p><\/SPAN><\/P>
\n

\u7a0b\u5e8f\u64cd\u4f5c\u51fa\u73b0\u9519\u8bef\u65f6\u901a\u5e38\u4f1a\u5199<\/SPAN>errno<\/SPAN>\uff0c<\/SPAN>errno<\/SPAN>\u4e0e\u9519\u8bef\u4fe1\u606f\u8868sys_errlist<\/SPAN><\/SPAN>\u8054\u7cfb\uff0c\u800c<\/SPAN>sys_errlist<\/SPAN>\u662f\u4ee5<\/SPAN>errno<\/SPAN>\u4e3a\u5e8f\u7684\u4e00\u4e2a\u9519\u8bef\u4fe1\u606f\u5217\u8868\u3002<\/SPAN><\/o:p><\/SPAN><\/P><\/o:p><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/SPAN><\/p>\n","protected":false},"excerpt":{"rendered":"

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