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strtok函数的介绍

news 2025/8/3 16:30:13

_str指被分解的字符串 delim指分隔符字符串返回类型是指针

strtok()用来将字符串分割成一个个片段。参数s指向欲分割的字符串，参数delim则为分割字符串中包含的所有字符。当strtok()在参数s的字符串中发现参数delim中包含的分割字符时,则会将该字符改为\0 字符。在第一次调用时，strtok()必需给予参数s字符串，往后的调用则将参数s设置成NULL。每次调用成功则返回指向被分割出片段的指针。

example:

"fafdsas,dkslafkaf,dsaf,dsa,as,a,kfldadg" ","

第一次调用 "fafdsas'\0'(第二次从这里指向开始)dkslafkaf,dsaf,dsa,as,a,kfldadg"

"fafdsas'\0'dkslafkaf'\0'dsaf,dsa,as,a,kfldadg"

"fafdsas'\0'dkslafkaf'\0'dsaf'\0'dsa,as,a,kfldadg"

"fafdsas'\0'dkslafkaf'\0'dsaf'\0'dsa'\0'as,a,kfldadg"

"fafdsas'\0'dkslafkaf'\0'dsaf'\0'dsa'\0'as'\0'a,kfldadg"

"fafdsas'\0'dkslafkaf'\0'dsaf'\0'dsa'\0'as'\0'a'\0'kfldadg"

最后指向最后'\0' 返回NULL

#include <string.h>
#include <stdio.h>
int main()
{
   char arr[128] = { '\0'};
   char* str[128];
   int i = 0;
   int z = 0;
   gets(arr);
   str[z] = strtok(arr," ");
   while( str[z] != NULL )
   {
       z++;
       str[z] = strtok(NULL," ");第二次使用时可以不用写arr,而是写NULL
   }
   for( i = 0 ; i < z; i++)
   {
       printf("%s\n",str[i]);
   }
   return 0;
}