#include <iostream.h>

char my_toupper (char);

void main() {

  char inp, up;

  cout << "Enter a character: ";
  cin >> inp;

  up = my_toupper(inp);

  cout << "The uppercase version of " << inp << " is " << up <<".\n";
}

char my_toupper(char c){

  if (c >= 'a' && c <= 'z')  // tests if c is a lowercase letter
    return c + 'A' - 'a';    /* gives the uppercase version of a lowercase
                                letter.  Why does this work?  Check the
                                case c is 'b'.   */
  else
    return c;
}