C++ strcspn()用法及代码示例

C /C++中的strcspn()函数将两个字符串作为输入，即string_1和string_2作为参数，并通过遍历string_2中存在的任何字符来搜索string_1。如果在string_1中找不到string_2的任何字符，则该函数将返回string_1的长度。此函数在cstring头文件中定义。

用法:

size_t strcspn ( const char *string_1, const char *string_2 )

参数：该函数接受两个强制性参数，如下所述：

string_1:指定要搜索的字符串
string_2:指定包含要匹配的字符的字符串

返回值：此函数返回从string_2匹配的任何字符之前在string_1中遍历的字符数。

以下示例程序旨在说明上述函数：

程序1:

// C++ program to illustrate the 
// strcspn() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // String to be travered 
    char string_1[] = "geekforgeeks456"; 
  
    // Search these characters in string_1 
    char string_2[] = "123456789"; 
  
    // function strcspn() traverse the string_1 
    // and search the characters of string_2 
    size_t match = strcspn(string_1, string_2); 
  
    // if matched return the position number 
    if (match < strlen(string_1)) 
        cout << "The number of characters before"
             << "the matched character are " << match; 
  
    else
        cout << string_1 <<  
        " didn't matched any character from string_2 "; 
    return 0; 
}

输出：

The number of characters beforethe matched character are 12

程序2:

// C++ program to illustrate the 
// strcspn() function When the string 
// containing the character to be 
// matched is empty 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // String to be travered 
    char string_1[] = "geekforgeeks456"; 
  
    // Search these characters in string_1 
    char string_2[] = ""; // Empty 
  
    // function strcspn() traverse the string_1 
    // and search the characters of string_2 
    size_t match = strcspn(string_1, string_2); 
  
    // if matched return the position number 
    if (match < strlen(string_1)) 
        cout << "The number of character before"
             << "the matched character are " << match; 
    else
        cout << string_1 <<  
        " didn't matched any character from string_2  "; 
    return 0; 
}

输出：

geekforgeeks456 didn't matched any character from string_2

相关用法

注：本文由纯净天空筛选整理自AmanSrivastava1大神的英文原创作品 strcspn() function in C/C++。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。