/*
 * Program to illustrate pass by reference / pointers.
 */
#include <stdio.h>

/*
 * Prompt user for two numbers and put in locations supplied by
 * caller.  Parameter z illustrates what happens when parameters
 * are passed directly rather than using pointers.
 */
int get_two_numbers(int *a, int *b, int z) {
	/* as done in class 
	int aa = 0, bb = 0, return_val;
	printf("enter two numbers\n");
	return_val = scanf("%d %d", &aa, &bb);
	*a = aa;
	*b = bb;
	z = 50;
	return return_val;
	*/
	/* shorter way */
	z = 50;
	printf("enter two numbers\n");
	return scanf("%d %d", a, b);
}

/*
 * Main program.
 */
int main(void) {

	int x, y, z;

	if (get_two_numbers(&x, &y, z) == 2) {
		printf("AOK %d %d %d\n", x, y, z);
	}
	else {
		printf("error\n");
	}
	return 0;
}