/*
 * project4
 * Chapter 4
 * John Stile
 * Purpose: Write a program that asks the user for an uppoer case letter, 
 *          checks to see if the user did as instructed, 
 *          and then responds with the correesponding lower case letter..
 */
#include <stdio.h> // include functions in stdio.h

int main(void) // header for main.  take nothing, return int
{
  char xx;  // declare char variable xx
  
  printf("Please ender a lower case letter: "); // prompt user for an upper case letter
  scanf("%c", &xx); // read singl caracter and stor at memory location of xx 
  // only allow letters
  if (xx<65  || xx>90) // if the value of the input is out of range of an upper case ASCII, 
  {
      printf("That is not a lower case letter!\n");  // chastize the user and exit
      return 1;  // return value of 1 to calling function
  }
  
  printf("The corresponding lower case letter is: %c \n", xx+32); // print the value of xx+32 and print as char

  return 0; // return a value of 0 to the calling function
}