hello.c
/* * File: hello.c
* --------------
* This program prints the message "Hello, world."
* on the screen. The program is taken from the
* classic C reference text "The C Programming
* language" by Brian Kernighan ang Dennis Ritchie.
*/
#include <stdio.h>
#include "genlib.h"
main()
{
printf("Hello, world.\n");
getchar();
}

add2.c
/* *file:add2.c
*-----------
*This program reads in two numbers, adds them together,
*and prints their sum.
*/
#include <stdio.h>
#include "genlib.h"
#include "simpio.h"
main()
{
int n1, n2, total;
printf("this program adds two numbers.\n");
printf("1st number? ");
n1 = GetInteger();
printf("2nd number? ");
n2 = GetInteger();
total = n1 + n2;
printf("The total is %d.\n", total);
getchar();
}