/*
 * question6.c
 * FINAL
 * BY: John Stile
 * Purpose: 
 *   Prompt user for 2 numbers.
 *   pass pointers to variables holding the numbers to a function 
 *   that squares the values, returning nothing.
 *   Then main should output the squared values.
 *   a) PLAN: 
 *    what piece would you write first.
 *    what would its functionality be?
 *    How would you modify the first piece to become the second.
 *   b) Follow your plan.
 *
 *   PLAN: write program skeleton (prototypes, headers)
 *         prompt for user input
 *         add section to prompt for input
 *         write function prottype and header
 *         write the function
 *         test
 */
#include <stdio.h>

void square( int *, int *); // takes 2 pointers, returns nothing

int main(void)
{
  int a, b; // declare 2 itns

  printf("Enter fist number: "); // prompt for input
  scanf( "%d", &a ); // read from stdin, and store as digit
  getchar(); // clear input buffer

  printf("Enter second number: "); // prompt for input
  scanf( "%d", &b ); // read from stdin, and store as digit

  square( &a, &b ); // call function, passing addresses of a and b

  printf("\nThe square of the first is:  %d\n", a); // print result
  printf("The square of the second is: %d\n", b); // print result

  return 0;
}

void square( int * first, int * second) // takes 2 int pointers, returns nothing
{
  *first=(*first)*(*first); // square the frist number. re-assign in place
  *second=(*second)*(*second); // square the second number, re-assign in place
  return; // return nothing
}