C Tutorial/string.h/strcoll

Item           Value
Header file    #include <string.h>
Declaration    int strcoll(const char *str1, const char *str2);
Function       compares the *str1 to *str2 in accordance with the locale specified using the setlocale() function.
Return         returns an integer that is interpreted as follows:
Value   Meaning
<0      str1 is less than str2
0       str1 is equal to str2
>0      str1 is greater than str2

#include<stdio.h>
#include<string.h>
int main(void){
    if(strcoll("hi", "hi")) {
       printf("Equal");
    }
}