01  #include<stdio.h>
02  #include<string.h>
03  
04  int main()
05  {
06   char str1[20] = "fantastic";
07   char str2[20] = "FANTASTIC";
08   int i;
09  
10   i=strcmpi(str1,str2);
11   if(i==0)
12   {
13    printf("Strings are equal");
14   } 
15   else
16   {
17    printf("Strings are not equal");
18   }
19   return 0;
20  }

 OUTPUT :
 
 Strings are equal