Thread: Need Help With A Do While Loop

Hi

I am a student at Westminster Kingsway college and i am studying c programming for my course, i need some help for a coffee dispenser that i created for one of my assessments.

Every Time I Ask For Change It Does Not Stop Looping

Code:

#include<process.h>
#include"header.h"
#include<stdio.h>
#include<conio.h>


void main(void)//Emre
{
    int mainoption;
    system("color 9f");
    do{
        mainoption = SnacksMainMenu();//Sheku
        SnacksMenuChoice(mainoption);//Riffat
        ClearTheScreen();
    }while(mainoption != 2768);
    getch();
}


unsigned int SnacksMainMenu(void)//SnacksMainMenu
{
    int option;
    printf("The Rapid Snacks Coffee Dispenser - *** By Emre Celikoz *** \n");
    printf("\n1.  Coffee With Milk : 50p\n");
    printf("2.  Coffee Without Milk : 50p\n");
    printf("3.  Coffee with Sugar : 50p\n");
    printf("4.  Coffee Without Sugar : 50p\n");
    printf("5.  Tea With Milk : 50p\n");
    printf("6.  Tea Without Milk : 50p\n");
    printf("7.  Tea With Sugar : 50p\n");
    printf("8.  Tea With Sugar : 50p\n");
    printf("9.  Chicken And Vegetable Soup : 75p\n");
    printf("10. Mulligatawny Soup : 75p\n");
    printf("11. Tomato Soup : 75p\n");
    printf("12. Hot Chocolate : 35p\n");
    printf("13. Hot Water : 10p\n");
    printf("\n");
    printf("Please Enter Your Selection Number > ");
    scanf("%d",&option);
    return option;
}
void SnacksMenuChoice(unsigned int choice)//SnacksMenuChoice
{
    if(choice == 1)//Coffee With Milk
    {
    int AmountOwing = 50;
    int Contribution;
    int AmountOfDebt;
    int Change;
    AmountOfDebt = AmountOwing;
    printf("\nYou Have  Selected Coffee With Milk...\n");
    printf("\nPlease Enter %d > ",AmountOwing);
    scanf("%d",&Contribution);


        if(Contribution <= 49){
            do{
                printf("\nEnter amount >");
                scanf("%d",&Contribution);
                AmountOfDebt = AmountOfDebt - Contribution;
            }while(AmountOfDebt != 0);
        }
        else if(Contribution == 50)
        {
            printf("Thank You For Your Using Rapid Snacks\n");
            printf("Please Collect Your Item From Below\n");
        }
        else if(Contribution >= 51){
            printf("Thank You For Your Using Rapid Snacks\n");
            Change = Contribution - 50;
            printf("Please Collect Your Change %d\n",Change);
            printf("Please Collect Your Item From Below\n");
        }
        getch();
    }

Thank You, Hackstorix

If amountofdebt goes negative then the code will run for a long time, until you get an overflow.

So you need to put it checks.#

As a general approach, printf() diagnostics to help with debugging.