#include<stdio.h>
#include<string.h>
main( )
{
  char s1[ ] = "AC" ;   // B --> 66
  char s2[ ] = "ABC" ;   // A --> 65   
  //int x;
  //x = s1[0]-s2[0];  // 66 - 65 = -1
  
  printf ( "%d \n", strcmp(s1,s2) ) ;
  system("pause");
}