ISUPPER FUNCTION

#include <stdio.h>

int main() {

  if( isupper( 'a' ) )
  {
     printf( "Character a is upper case\n" );
  }
  if( isupper( 'A' ) )
  {
     printf( "Character A is upper case\n" );
  }
  
  getchar();
  return 0;