/*
 * Very very simple program illustrating use of functions and
 * simple input with error checking.
 */
#include <stdio.h>

/* function declaration / prototype */
void foobar(int x, int y);

int main(void) {
	int x, y;

    /* prompt for and get new values */
	printf("enter two integers\n");
    if (scanf("%d %d", &x, &y) == 2) {
        /* obtained two integer values from standard input */
        foobar(x, y);
    } else {
        /* error */
        printf("input error\n");
    }

	return 0;
}

/* function definition */
void foobar(int x, int y) {
	printf("%d %d\n", x, y);
}