C/C中的strcspn（）函数++-yiteyi-C++库

这个 strcspn（） C/C++中的函数以两个字符串作为输入， 字符串_1 和 字符串2 作为参数，通过遍历字符串_2中存在的任何字符来搜索字符串_1。如果在字符串_1中找不到字符串_2的任何字符，函数将返回字符串_1的长度。此函数在中定义 cstring 头文件。 语法：

null

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

参数： 该函数接受两个强制参数，如下所述：

字符串_1： 指定要搜索的字符串
字符串2： 指定包含要匹配的字符的字符串

返回值： 此函数返回在字符串_1中经过的字符数，在与字符串_2匹配的任何字符之前。以下程序说明了上述功能： 项目1：

CPP

                         // C++ program to illustrate the                       
                         // strcspn() function                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         int                                     main()                       
                         {                       
                                                 // String to be traversed                       
                                                 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

项目2：

CPP

                         // 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 traversed                       
                                                 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

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