C++ strcoll()用法及代码示例

strcoll()是内置库函数，并在头文件中声明。此函数将str1指向的字符串与str2指向的字符串进行比较。strcoll()函数根据当前语言环境的LC_COLLATE类别的规则执行比较。句法：

int strcoll(const char *str1, const char *str2)

参数：函数strcoll()将两个字符串作为参数，并返回一个整数值。

Value                   Meaning
less than zero          str1 is less than str2
zero                    str1 is equal to str2
greater than zero       str1 is greater than str2

1. 小于零：当str1小于str2时

   // C program to illustrate strcoll() 
   #include <stdio.h> 
   #include <string.h> 
     
   int main() 
   { 
       char str1[10]; 
       char str2[10]; 
       int ret; 
     
       strcpy(str1, "geeksforgeeks"); 
       strcpy(str2, "GEEKSFORGEEKS"); 
     
       ret = strcoll(str1, str2); 
     
       if (ret > 0) { 
           printf("str1 is greater than str2"); 
       } else if (ret < 0) { 
           printf("str1 is lesser than str2"); 
       } else { 
           printf("str1 is equal to str2"); 
       } 
     
       return (0); 
   }

   输出：

   
   

   str1 is greater than str2
   

2. 大于零：当str1大于str2时

   // C program to illustrate strcoll() 
   #include <stdio.h> 
   #include <string.h> 
     
   int main() 
   { 
       char str1[10]; 
       char str2[10]; 
       int ret; 
     
       strcpy(str1, "GEEKSFORGEEKS"); 
       strcpy(str2, "geeksforgeeks"); 
     
       ret = strcoll(str1, str2); 
     
       if (ret > 0) { 
           printf("str1 is greater than str2"); 
       } else if (ret < 0) { 
           printf("str1 is lesser than str2"); 
       } else { 
           printf("str1 is equal to str2"); 
       } 
     
       return (0); 
   }

   输出：

   str1 is lesser than str2
   

3. 等于零：当str1等于str2时

   // C program to illustrate strcoll() 
     
   #include <stdio.h> 
   #include <string.h> 
     
   int main() 
   { 
       char str1[10]; 
       char str2[10]; 
       int ret; 
     
       strcpy(str1, "GEEKSFORGEEKS"); 
       strcpy(str2, "GEEKSFORGEEKS"); 
     
       ret = strcoll(str1, str2); 
     
       if (ret > 0) { 
           printf("str1 is greater than str2"); 
       } else if (ret < 0) { 
           printf("str1 is lesser than str2"); 
       } else { 
           printf("str1 is equal to str2"); 
       } 
     
       return (0); 
   }

   输出：

   str1 is equal to str2
   

相关函数：strcmp()，memcmp()