#include <stdio.h>

#define MAX_ITEM 2

#define REG_HAM_CODE 1
#define COKE_CODE 2

#define REG_HAM_PRICE 2000
#define COKE_PRICE 1000

main()
{
int flag; /* flag for scanf */
int processing; /* 1 for processing, 0 for end of processing */
int item_code; /* for menu item code */
int number; /* the number of item */

int no_of_reg_ham; /* for one customer */
int no_of_coke;

int sub_total; /* subtotal */
int personal_total; /* total price for one customer */

/* init process */
flag = 1;
processing = 1;
no_of_reg_ham = 0;
no_of_coke = 0;
personal_total = 0;

while (flag == 1 && processing == 1) {

/* print out the menu */
printf("\n****************************************");
printf("\n* %2d. Regular hamburger %14d *", REG_HAM_CODE, REG_HAM_PRICE);
printf("\n* %2d. Coke %14d *", COKE_CODE, COKE_PRICE);
printf("\n****************************************");

printf("\n Enter the item code (0 for quit) : ");
flag = scanf("%d", &item_code);

if (flag == 1) {
if ((item_code > 0) && (item_code < MAX_ITEM + 1)) {
printf(" Enter the number : ");
flag = scanf("%d", &number);

if (flag == 1) {
if ((item_code == REG_HAM_CODE) && (number >= 0)) {
no_of_reg_ham = no_of_reg_ham + number;
}
else if ((item_code == COKE_CODE) && (number >= 0)) {
no_of_coke = no_of_coke + number;
}
else {
printf("\n Error --- Check the number !!\n");
}
}
else {
processing = 0;
}
}
else if (item_code == 0) {
processing = 0;
}
else {
printf("\n Error --- Check the item code !!\n");
}
}
else {
processing = 0;
}

} /* while - for one customer */

/* print a result */
printf("\n----------------------------------------");

sub_total = no_of_reg_ham * REG_HAM_PRICE;
personal_total = personal_total + sub_total;
printf("\n Regular Hamberger : %2d %14d", no_of_reg_ham, sub_total);

sub_total = no_of_coke * COKE_PRICE;
personal_total = personal_total + sub_total;
printf("\n Coke : %2d %14d", no_of_coke, sub_total);

printf("\n----------------------------------------");
printf("\n TOTAL: %30d\n", personal_total);

printf("\nBye\n");
}