strcasecmp

//https://en.wikibooks.org/wiki/C_Programming/C_Reference/nonstandard/strcasecmp

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

int main ()
{

    int i;

    char str1[]="test";
    char str2[]="Test";
    char str3[]="Testing";
    char str4[]="Testing 555";
    char str5[]="testing 555";
    char str6[]="Testing 123";


    printf("(1)\n");

    i = strcasecmp(str1, str2);

    if (i == 0)
        printf("'%s' equals '%s'\n", str1, str2);
    else if (i > 0)
        printf("'%s' is greater than '%s'\n", str1, str2);
    else if (i < 0)
        printf("'%s' is less than '%s'\n", str1, str2);

    printf("(2)\n");

    i = strcasecmp(str1, str3);

    if (i == 0)
        printf("'%s' equals '%s'\n", str1, str3);
    else if (i > 0)
        printf("'%s' is greater than '%s'\n", str1, str3);
    else if (i < 0)
        printf("'%s' is less than '%s'\n", str1, str3);

    printf("(3)\n");

    i = strcasecmp(str3, str1);

    if (i == 0)
        printf("'%s' equals '%s'\n", str3, str1);
    else if (i > 0)
        printf("'%s' is greater than '%s'\n", str3, str1);
    else if (i < 0)
        printf("'%s' is less than '%s'\n", str3, str1);

    printf("(4)\n");

    i = strcasecmp(str4, str6);

    if (i == 0)
        printf("'%s' equals '%s'\n", str4, str6);
    else if (i > 0)
        printf("'%s' is greater than '%s'\n", str4, str6);
    else if (i < 0)
        printf("'%s' is less than '%s'\n", str4, str6);

    printf("(5)\n");

    i = strcasecmp(str5, str6);

    if (i == 0)
        printf("'%s' equals '%s'\n", str5, str6);
    else if (i > 0)
        printf("'%s' is greater than '%s'\n", str5, str6);
    else if (i < 0)
        printf("'%s' is less than '%s'\n", str5, str6);

   return 0;

}

/*

output:

(1)
'test' equals 'Test'
(2)
'test' is less than 'Testing'
(3)
'Testing' is greater than 'test'
(4)
'Testing 555' is greater than 'Testing 123'
(5)
'testing 555' is greater than 'Testing 123'


*/