/*  
 *
 *  Program Name : countdown, our first C program             
 *                                                           
 *  Description  : This program prompts the user to type in 
 *  a positive number and counts down from that number to 0,
 *  displaying each number along the way.                      
 *
 */

/* The next two lines are preprocessor directives */
#include <stdio.h>  
#define STOP 0      

/* Function    : main                                     */
/* Description : prompt for input, then display countdown */
int main()
{
  /* Variable declarations */
  int counter;         /* Holds intermediate count values */
  int startPoint;      /* Starting point for count down   */
  
  /* Prompt the user for input */
  printf("===== Countdown Program =====\n");
  printf("Enter a positive integer: ");  
  scanf("%d", &startPoint);
  
  /* Count down from the input number to 0 */
  for (counter = startPoint; counter >= STOP; counter--)
    printf("%d\n", counter);
}