C語言 strspn()用法及代碼示例

strspn()函數返回str1指向的字符串的初始子字符串的長度，該字符串僅由str2指向的字符串中包含的那些字符組成。

用法:

size_t strspn(const char *str1, const char *str2)
str1: string to be scanned.
str2: string containing the 
characters to match.
返回值： This function
returns the number of characters
in the initial segment of str1 
which consist only of characters 
from str2.

   
// C program to illustrate strspn() function 
#include <stdio.h> 
#include <string.h> 
  
int main () { 
   int len = strspn("geeks for geeks","geek"); 
   printf("Length of initial segment matching:%d\n", len );     
   return(0); 
}

輸出：

Length of initial segment matching 4

   
// C program to illustrate strspn() function 
#include <stdio.h> 
#include <string.h> 
  
int main () { 
   int len = strspn("i am","xyz"); 
   printf("Length of initial segment matching:%d\n", len ); 
   return(0); 
}

輸出：

Length of initial segment matching 0

相關用法

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