/*
 * Program to illustrate simple use of struct.
 *
 * Input:  none
 *
 * Output:  results of calling various functions.
 */
#include <stdio.h>
#include <stdlib.h>

/* user-defined type for money -- dollars and cents */
typedef struct {
	int dollars;
	int cents;
} money;

/* print m in an appropriate format (with dollar sign, decimal point) */
void print(money m) {
	printf("$%d.%02d", m.dollars, m.cents);
}

/* add m2 to m1 */
void add_to(money *m1, money m2) {
	m1->dollars += m2.dollars;
	m1->cents += m2.cents;	
	if (m1->cents >= 100) {
		m1->cents -= 100;
		m1->dollars += 1;
	}
}

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

	money bank_bal = { 100, 0 };
	money to_add = { 0, 50 };

	printf("balance is ");
	print(bank_bal);
	printf("\n");

	add_to(&bank_bal, to_add);
	printf("after adding, balance is ");
	print(bank_bal);
	printf("\n");

	add_to(&bank_bal, to_add);
	printf("after adding, balance is ");
	print(bank_bal);
	printf("\n");

	return EXIT_SUCCESS;
}