/*
 * Extremely simple (and silly) example of defining and using function.
 */
#include <stdio.h>

int add(int a, int b); /* function  declaration */

int main(void) {
	printf("enter two integers\n");
	int x, y;
	if (scanf("%d %d" , &x, &y) != 2) {
		printf("not numbers\n");
		return 1;
	}
	int result = add(x, y);
	printf("%d + %d is %d\n", x, y, result);
	return 0;
}

int add(int a, int b) { /* function definition */
	return a + b;
}