\n| isprint<\/td>\n | \u4efb\u4f55\u53ef\u6253\u5370\u5b57\u7b26，\u5305\u62ec\u56fe\u5f62\u5b57\u7b26\u548c\u7a7a\u767d\u5b57\u7b26<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n2.\u5b57\u7b26\u8f6c\u6362\u51fd\u6570<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 C\u8bed\u8a00\u8fd8\u63d0\u4f9b\u4e862\u4e2a\u5b57\u7b26\u8f6c\u6362\u51fd\u6570：<\/p>\n int tolower (int c);\/\/\u5c06\u5927\u5199\u5b57\u6bcd\u8f6c\u6210\u5c0f\u5199\u5b57\u6bcd<\/p>\n int toupper (int c);\/\/\u5c06\u5c0f\u5199\u5b57\u6bcd\u8f6c\u6210\u5927\u5199\u5b57\u6bcd<\/p>\n 3.strlen\u7684\u4f7f\u7528\u548c\u6a21\u62df\u5b9e\u73b0<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 （\u4e00）strlen\u51fd\u6570：\u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 size_t strlen (const char* str);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u5b57\u7b26\u4e32，\u4ee5'\\\\0'\u4f5c\u4e3a\u7ed3\u675f\u6807\u5fd7，\u00a0strlen\u51fd\u6570\u8fd4\u56de\u7684\u662f\u5728\u5b57\u7b26\u4e32\u4e2d'\\\\0'\u524d\u9762\u51fa\u73b0\u7684\u5b57\u7b26\u4e2a\u6570，\u4e0d\u5305\u542b'\\\\0'\u3002
\n\u00a0 \u00a0 \u00a0 \u00a0 *\u53c2\u6570\u6307\u5411\u7684\u5b57\u7b26\u4e32\u5fc5\u987b\u8981\u4ee5'\\\\0'\u7ed3\u675f，\u8fd4\u56de\u503c\u4e3asize_t\u662f\u65e0\u7b26\u53f7\u7684,strlen\u7684\u4f7f\u7528\u9700\u8981\u5305\u542b\u5934\u6587\u4ef6<string.h>\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 （\u4e8c）strlen\u51fd\u6570\u6a21\u62df\u5b9e\u73b0<\/h5>\n\/\/\u8ba1\u6570\u5668
\nint my_strlen(const char* p)
\n{
\n assert(p);
\n int count=0;
\n while(*p)
\n {
\n count++;
\n p++;
\n }
\n return count;
\n}
\n\/\/\u9012\u5f52
\nint my_strlen(const char* p)
\n{
\n assert(p);
\n if(*p=='\\\\0')
\n return 0;
\n else
\n return 1+my_strlen(p+1);
\n}
\n\/\/\u6307\u9488-\u6307\u9488
\nint my_strlen(const char* p)
\n{
\n assert(p);
\n char *p1=p;
\n while(*p)
\n p++;
\n return p-p1;
\n}<\/p>\n 4.strcpy\u7684\u4f7f\u7528\u548c\u6a21\u62df\u5b9e\u73b0<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 （\u4e00）strcpy\u51fd\u6570：\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u590d\u5236\u5230\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 char *strcpy(char *dest,const char *src);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u6e90\u5b57\u7b26\u4e32\u5fc5\u987b\u4ee5'\\\\0'\u7ed3\u675f，\u62f7\u8d1d\u65f6\u6e90\u5b57\u7b26\u4e32\u4e2d\u7684'\\\\0'\u4e5f\u8981\u62f7\u8d1d\u8fc7\u53bb\u3002
\n\u00a0 \u00a0 \u00a0 \u00a0 *\u76ee\u6807\u7a7a\u95f4\u5fc5\u987b\u53ef\u4ee5\u4fee\u6539\u5e76\u4e14\u8db3\u591f\u5927，\u786e\u4fdd\u5b57\u7b26\u4e32\u987a\u5229\u62f7\u8d1d\u3002
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0*\u4f7f\u7528\u65f6\u9700\u8981\u5305\u542b\u5934\u6587\u4ef6<string.h>\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 （\u4e8c）strcpy\u51fd\u6570\u6a21\u62df\u5b9e\u73b0<\/h5>\n#include <stdio.h>
\n#include <assert.h>
\nchar *my_strcpy(char *dest,const char*src)
\n{
\n assert(dest&&src);
\n char *ret=dest;
\n while(*dest++==*src++)
\n ;
\n return ret;
\n}
\nint main()
\n{
\n char str1[]="abcdef";
\n char str2[20];
\n char *str=my_strcpy(str1,str2);
\n printf("%s\\\\n",str1);
\n printf("%s\\\\n",str);
\n return 0;
\n}<\/p>\n 5.strcat\u7684\u4f7f\u7528\u548c\u6a21\u62df\u5b9e\u73b0<\/h4>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0（\u4e00）strcat\u51fd\u6570：\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u5230\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 char *strcat(char *dest,const char *src);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u6e90\u5b57\u7b26\u4e32\u5fc5\u987b\u4ee5'\\\\0'\u7ed3\u675f，\u76ee\u6807\u5b57\u7b26\u4e32\u4e5f\u5fc5\u987b\u5305\u542b'\\\\0'，\u5426\u5219\u8ffd\u52a0\u65f6\u5019\u4e0d\u77e5\u9053\u4ece\u54ea\u91cc\u8d77\u59cb\u548c\u7ed3\u675f\u3002
\n\u00a0 \u00a0 \u00a0 \u00a0 *\u76ee\u6807\u7a7a\u95f4\u5fc5\u987b\u53ef\u4ee5\u4fee\u6539\u5e76\u4e14\u8db3\u591f\u5927，\u786e\u4fdd\u5b57\u7b26\u4e32\u987a\u5229\u8ffd\u52a0\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 （\u4e8c）strcat\u51fd\u6570\u6a21\u62df\u5b9e\u73b0<\/h5>\n#include <stdio.h>
\n#include <assert.h>
\nchar *my_strcat(char *dest,const char *src)
\n{
\n assert(dest&&src);
\n char *ret=dest;
\n while(*dest)
\n dest++;
\n while(*dest++=*src++)
\n ;
\n return ret;
\n}
\nint main()
\n{
\n char str1[20]="abcdef";
\n char str2[]="ghijklmn";
\n char *str=my_strcat(str1,str2);
\n printf("%s\\\\n",str1);
\n printf("%s\\\\n",str);
\n return 0;
\n}<\/p>\n *\u8be5\u4ee3\u7801\u65e0\u6cd5\u5b9e\u73b0\u5b57\u7b26\u4e32\u8ffd\u52a0\u672c\u8eab\u3002<\/p>\n 6.strcmp\u7684\u4f7f\u7528\u548c\u6a21\u62df\u5b9e\u73b0<\/h4>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0（\u4e00）strcmp\u51fd\u6570：\u5b57\u7b26\u4e32\u6bd4\u8f83\u51fd\u6570<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 int strcmp(const char *str1,const char *str2);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u5b57\u7b26\u4e32\u8981\u4ee5'\\\\0'\u7ed3\u675f，\u4e24\u4e2a\u5b57\u7b26\u4e32\u8fdb\u884c\u6309\u4f4d\u6bd4\u8f83\u5bf9\u5e94\u7684ASCII\u503c，str1\u5927\u4e8estr2，\u8fd4\u56de\u5927\u4e8e0\u7684\u6570\u5b57；str1\u7b49\u4e8estr2，\u8fd4\u56de0；str1\u5c0f\u4e8estr2，\u8fd4\u56de\u5c0f\u4e8e0\u7684\u6570\u5b57\u3002
\n\u00a0 \u00a0 \u00a0 \u00a0 *\u4f7f\u7528\u65f6\u9700\u8981\u5305\u542b\u5934\u6587\u4ef6<string.h>\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 （\u4e8c）strcmp\u51fd\u6570\u6a21\u62df\u5b9e\u73b0<\/h5>\n#include <stdio.h>
\n#include <assert.h>
\nint my_strcmp(const char *str1,const char *str2)
\n{
\n assert(str1&&str2);
\n while(*str1==*str2)
\n {
\n if(*str1=='\\\\0')
\n return 0;
\n str1++;
\n str2++;
\n }
\n return *str1-*str2;
\n}
\nint main()
\n{
\n char str1[]="abcdef";
\n char str2[]="abbcc";
\n int ret=my_strcmp(str1,str2);
\n printf("%d\\\\n",ret);
\n return 0;
\n}<\/p>\n 7.strncpy\u7684\u4f7f\u7528<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 strncpy\u51fd\u6570：\u4ece\u6e90\u5b57\u7b26\u4e32\u4e2d\u62f7\u8d1d\u6307\u5b9a\u6570\u91cf\u7684\u5b57\u7b26\u5230\u76ee\u6807\u5b57\u7b26\u4e32\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 char *strncpy(char *dest,const char *src,size_t n);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *n\u662f\u6307\u5b9a\u62f7\u8d1d\u5b57\u7b26\u6570，\u5982\u679c\u6e90\u5b57\u7b26\u4e32\u957f\u5ea6\u5c0f\u4e8en，\u76ee\u6807\u5b57\u7b26\u4e32\u5c06\u7528\u2018\\\\0\u2019\u586b\u5145\u81f3n\u4e2a\u5b57\u7b26\u3002\u5982\u679c\u6e90\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u5927\u4e8en，\u76ee\u6807\u5b57\u7b26\u4e32\u53ef\u80fd\u4e0d\u4f1a\u4ee5'\\\\0'\u7ed3\u5c3e\u3002<\/p>\n 8.strncat\u7684\u4f7f\u7528<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 strncat\u51fd\u6570：\u5c06\u6e90\u5b57\u7b26\u4e32\u7684\u524dn\u4e2a\u5b57\u7b26\u8ffd\u52a0\u5230\u76ee\u6807\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 char *strncat(char *dest,const char *src,size_t n);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u51fd\u6570\u4f1a\u81ea\u52a8\u5728\u8ffd\u52a0\u7684\u5b57\u7b26\u540e\u6dfb\u52a0\u7ec8\u6b62\u7b26'\\\\0'\u3002
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0*\u5982\u679c\u6e90\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u5c0f\u4e8en，\u53ea\u4f1a\u5c06\u6e90\u5b57\u7b26\u4e32\u4e2d\u5230'\\\\0'\u7684\u5185\u5bb9\u8ffd\u52a0\u5230\u76ee\u6807\u5b57\u7b26\u4e32\u672b\u5c3e\u3002<\/p>\n 9.strncmp\u7684\u4f7f\u7528<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 strncmp\u51fd\u6570：\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u524dn\u4e2a\u5b57\u7b26\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f:<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 int strncmp(const char *str1,const char *str2,size_t n);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u6bd4\u8f83\u5728\u9047\u5230\u7a7a\u5b57\u7b26\u6216\u6bd4\u8f83\u5b8cn\u4e2a\u5b57\u7b26\u4e3a\u6b62\u3002
\n\u00a0 \u00a0 \u00a0 \u00a0 *str1\u5c0f\u4e8estr2，\u8fd4\u56de\u5c0f\u4e8e0\u7684\u503c；str1\u7b49\u4e8estr2，\u8fd4\u56de0；str1\u5927\u4e8estr2，\u8fd4\u56de\u5927\u4e8e0\u7684\u503c\u3002<\/p>\n 10.strstr\u7684\u4f7f\u7528\u548c\u6a21\u62df\u5b9e\u73b0<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0（\u4e00） strstr\u51fd\u6570：\u67e5\u627e\u5b50\u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u9996\u6b21\u51fa\u73b0\u4f4d\u7f6e\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 char *strstr(const char *str1,const char *str2);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *\u5982\u679c\u627e\u5230\u5b50\u5b57\u7b26\u4e32，\u8fd4\u56de\u6307\u5411\u9996\u6b21\u51fa\u73b0\u4f4d\u7f6e\u7684\u6307\u9488\u3002\u5982\u679c\u672a\u627e\u5230，\u8fd4\u56deNULL\u3002<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 （\u4e8c）strstr\u51fd\u6570\u6a21\u62df\u5b9e\u73b0<\/h5>\n#include <stdio.h>
\nchar* my_strstr(const char* str1,const char* str2)
\n{
\n char* s1=NULL;
\n char* s2=NULL;
\n char* cur=str1;
\n while(*cur)
\n {
\n s1=cur;
\n s2=str2;
\n while(*s1==*s2&&*s1!='\\\\0'&&*s2!='\\\\0')
\n {
\n s1++;
\n s2++;
\n }
\n if(*s2=='\\\\0')
\n return cur;
\n cur++;
\n }
\n return NULL;
\n}
\nint main()
\n{
\n char arr1[]="abbbcdef";
\n char arr2[]="bbcde";
\n char* ret=my_strstr(arr1,arr2);
\n if(ret!=NULL)
\n printf("%s\\\\n",ret);
\n else
\n printf("\u6ca1\u627e\u5230\\\\n");
\n return 0;
\n}<\/p>\n 11.strtok\u7684\u4f7f\u7528<\/h4>\n\u00a0 \u00a0 \u00a0 \u00a0 strtok\u51fd\u6570：\u5b57\u7b26\u4e32\u5206\u5272\u51fd\u6570，\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u6309\u6307\u5b9a\u7684\u5206\u5272\u7b26\u62c6\u5206\u4e3a\u591a\u4e2a\u5b50\u5b57\u7b26\u4e32\u3002<\/h5>\n\u8bed\u6cd5\u5f62\u5f0f：<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 char *strtok(char *str,const char *sep);<\/p>\n \u00a0 \u00a0 \u00a0 \u00a0 *str\u5f85\u5206\u5272\u7684\u5b57\u7b26\u4e32\u5728\u9996\u6b21\u8c03\u7528\u65f6\u4f20\u5165，\u540e\u7eed\u8c03\u7528\u4f20\u5165NULL\u3002strtok\u51fd\u6570\u4f1a\u8fd4\u56de\u4e0b\u4e00\u4e2a\u5b50\u5b57\u7b26\u4e32\u7684\u6307\u9488，\u5982\u679c\u6ca1\u6709\u66f4\u591a\u7684\u5b57\u7b26\u4e32，\u8fd4\u56deNULL\u3002
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