/*
 * Simple example of simple addition function.
 */
#include <stdio.h>

/* function declaration */
int sum(int x, int y); 

/* main function */
int main(void) {

	int x, y;

	printf("enter two integers\n");
	if (scanf("%d %d", &x, &y) != 2) {
		printf("bad input\n");
		return 1; /* nonzero return means error */
	}
	printf("x, y, sum %d %d %d\n", x, y, sum(x, y));
	return 0;
}

/* function definition */
int sum(int x, int y) {
	return x + y;
}