#include<string.h>#include<stdio.h>intmain(){char*p;char*buffer;char*delims={" .,"};
buffer=strdup("Find words, all of them.");printf("%s\n",buffer);
p=strtok(buffer,delims);while(p!=NULL){printf("word: %s\n",p);
p=strtok(NULL,delims);}printf("%s\n",buffer);return0;}
#include<string.h>#include<stdio.h>intmain(){char*buf1="aaa",*buf2="bbb",*buf3="ccc";int ptr;
ptr=strcmp(buf2, buf1);if(ptr>0)printf("buffer 2 is greater than buffer 1\n");elseprintf("buffer 2 is less than buffer 1\n");
ptr=strcmp(buf2, buf3);if(ptr>0)printf("buffer 2 is greater than buffer 3\n");elseprintf("buffer 2 is less than buffer 3\n");return0;}
strncmp
函數原型: int strncmp(char *str1,char *str2,int count)
函數功能: 對str1和str2中的前count個字符按字典順序比較
函數返回: 小於0:str1<str2,等於0:str1=str2,大於0:str1>str2
參數說明: str1,str2-待比較的字符串,count-比較的長度
所屬文件: <string.h>
#include<string.h>#include<stdio.h>intmain(){int ptr;char*buf1="aaabbb",*buf2="bbbccc",*buf3="ccc";
ptr=strncmp(buf2,buf1,3);if(ptr>0)printf("buffer 2 is greater than buffer 1");elseprintf("buffer 2 is less than buffer 1");
ptr=strncmp(buf2,buf3,3);if(ptr>0)printf("buffer 2 is greater than buffer 3");elseprintf("buffer 2 is less than buffer 3");return(0);}
#include<stdio.h>#include<string.h>#include<alloc.h>intmain(){printf("%d\n",strspn("out to lunch","aeiou"));printf("%d\n",strspn("out to lunch","xyz"));return0;}
strchr
函數原型: char* strchr(char* str,char ch);
函數功能: 找出str指向的字符串中第一次出現字符ch的位置
函數返回: 返回指向該位置的指針,如找不到,則返回空指針
參數說明: str-待搜索的字符串,ch-查找的字符
所屬文件: <string.h>
#include<string.h>#include<stdio.h>intmain(){char string[15];char*ptr, c='r';strcpy(string,"This is a string");
ptr=strchr(string, c);if(ptr)printf("The character %c is at position: %d\n",c,ptr-string);elseprintf("The character was not found\n");return0;}
strrchr
函數原型: char *strrchr(const char *s, int c)
函數功能: 得到字符串s中最後一個含有c字符的位置指針
函數返回: 位置指針
參數說明:
所屬文件: <string.h>
#include<string.h>#include<stdio.h>intmain(){char string[15];char*ptr,c='r';strcpy(string,"This is a string");
ptr=strrchr(string,c);if(ptr)printf("The character %c is at position:%d",c,ptr-string);elseprintf("The character was not found");return0;}
#include<stdio.h>#include<string.h>intmain(){char*string="abcdefghijklmnopqrstuvwxyz";char letter='x';printf("string before strnset: %s",string);strnset(string,letter,13);printf("string after strnset: %s",string);return0;}
#include<string.h>#include<stdio.h>intmain(){char*p;char*buffer;char*delims={" .,"};
buffer=strdup("Find words, all of them.");printf("%s\n",buffer);
p=strtok(buffer,delims);while(p!=NULL){printf("word: %s\n",p);
p=strtok(NULL,delims);}printf("%s\n",buffer);return0;}
#include<stdio.h>#include<string.h>intmain(){char src[]="******************************";char dest[]="abcdefghijlkmnopqrstuvwxyz0123456709";char*ptr;printf("destination before memcpy:%s\n",dest);
ptr=memcpy(dest,src,strlen(src));if(ptr)printf("destination after memcpy:%s\n",dest);elseprintf("memcpy failed");return0;}
#include<string.h>#include<stdio.h>intmain(){char*src="This is the source string";char dest[50];char*ptr;
ptr=memccpy(dest,src,'c',strlen(src));if(ptr){*ptr='\0';printf("The character was found:%s",dest);}elseprintf("The character wasn't found");return0;}
memchr
函數原型: void *memchr(const void *s, int c, size_t n)
函數功能: 在字符串中第開始n個字符中尋找某個字符c的位置
函數返回: 返回c的位置指針,返回NULL時表示未找到
參數說明: s-要搜索的字符串,c-要尋找的字符,n-指定長度
所屬文件: <string.h>,<mem.h>
#include<string.h>#include<stdio.h>intmain(){char str[17];char*ptr;strcpy(str,"This is a string");
ptr=memchr(str,'r',strlen(str));if(ptr)printf("The character 'r' is at position: %d",ptr-str);elseprintf("The character was not found");return0;}
memcmp
函數原型: int memcmp(const void *s1, const void *s2,size_t n)
函數功能: 按字典順序比較兩個串s1和s2的前n個字節
函數返回: <0,=0,>0分別表示s1<,=,>s2
參數說明: s1,s2-要比較的字符串,n-比較的長度
所屬文件: <string.h>,<mem.h>
#include<stdio.h>#include<string.h>intmain(){char*buf1="ABCDE123";char*buf2="abcde456";int stat;
stat=memcmp(buf1,buf2,5);printf("The strings to position 5 are ");if(stat)printf("not ");printf("the same\n");return0;}
memicmp
函數原型: int memicmp(const void *s1, const void *s2, size_t n)
函數功能: 按字典順序、不考慮字母大小寫對字符串s1,s2前n個字符比較
函數返回: <0,=0,>0分別表示s1<,=,>s2
參數說明: s1,s2-要比較的字符串,n-比較的長度
所屬文件: <string.h>,<mem.h>
#include<stdio.h>#include<string.h>intmain(){char*buf1="ABCDE123";char*buf2="abcde456";int stat;
stat=memicmp(buf1,buf2,5);printf("The strings to position 5 are ");if(stat)printf("not");printf("the same");return0;}
#include<string.h>#include<stdio.h>intmain(){char dest[40]="abcdefghijklmnopqrstuvwxyz0123456789";printf("destination prior to memmove:%s\n",dest);memmove(dest+1,dest,35);printf("destination after memmove:%s",dest);return0;}
memset
函數原型: void *memset(void *s, int c, size_t n)
函數功能: 字符串中的n個字節內容設置爲c
函數返回:
參數說明: s-要設置的字符串,c-設置的內容,n-長度
所屬文件: <string.h>,<mem.h>
#include<string.h>#include<stdio.h>#include<mem.h>intmain(){char buffer[]="Hello world";printf("Buffer before memset:%s\n",buffer);memset(buffer,'*',strlen(buffer)-1);printf("Buffer after memset:%s",buffer);return0;}