Making Vending Machine - Asking User To Insert More Money

Sep 23, 2014

So I am making a vending machine and am having trouble knowing what exactly to use or how to go about giving the user a error message depending if they initially added enough money for their choice of drink. So if the user only input 1 dollar, and the drink they select is $1.25, they need to add the $.25, but how do I implement that in this code?

Here is my code along with the zip file just in case.

package vending.sample;
import java.util.Scanner;
public class VendingSample {
public static void main(String[] args) {
int coke = 1, sprite = 2, DrPepper = 3, Pepsi = 4, Fanta = 5, Water = 6, selection, i;
double change, total;

[Code] ....

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Vending Machine - Tell User Combination Of Coins That Equals To Amount Of Change

Jan 25, 2012

I have a simple java program to write which tells the user combination of coins that equals to the amount of change i.e:

user input 87

output:

3 quarters
1 dime
0 nickels
2 pennies

How the program remembers the remainder which is passed to the next column of let say dime

i.e

originalAmount = amount;
quarters = amount /25;
amount = amount % 25; <---- this is confusing for me?!?! how can the integer = integer % 25
dimes = amount / 10; <--- HOW THE PROGRAM remembers the "remainder" instead of the original user input as the code it self tells you dimes = amount where "amount" is what user input NOT remainder.

amount = amount % 10;
so on ....;

What I don't understand is HOW this algorithm works. I mean we have int amount where user inputs the number we get the first calculation amount/25 = how many quarters and then amount %25 WILL tell us about the reminder. By looking at this piece of code I would say that the system should start the calculation for the dimes again from the original number since the code says dimes = amount/10 AND amount = amount%10. My understanding is that the calculation should be done from the original user input.

Book or code it self is not clear for me how the reminder is "REMEMBERED" and then pass on to the next calculation>!?!?

UNLESS the code: amount=amount%25 gets the remainder so the next code under it is REQUIRED to read from the last prompt code.

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May 1, 2014

keep getting an error when inventory is printed out. wont carry the money over. cant find out how to do it?

[import java.util.Scanner;
public class VMachine
{
Scanner input = new Scanner (System.in);
double candy;
double soda;
double dsoda;
double money;

[Code] ....

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I am having a difficult time writing what started out as a simple vending machine program. As I go on though, it seems that I'm overcomplicating it and it is getting messy, so I have resorted to the forum before I really get off the path. how to clean it up? I'm going to list a few of the problems I am having with the code below:

1. The user is supposed to enter his/her money and the program is to read each value separately (Do-While loop) and keep a running total of the money entered. I can't seem to get the right code format to do this. I was trying to do this with the variable total and so that is why the total exists in the switch statement, but it did not work.

2. In the second Do-While statement, is there a way to kick back an error when their are insufficient funds to purchase an item? Instead of getting a negative change return.

package practice;
import java.util.Scanner;
public class Practice {
public static void main(String[] args) {
double count, total;
int item;
//Display Available Options To Customer
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[code]....

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My superclass:

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public double price;
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public String name;
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[code]...

Besides not having to write the vendSoda() method again, what is the benefit of inheritance in a situation like this if you have to define all variables again? My second question is, how could I store all of the code strings from all of the different subclasses in one place? (so when the user enters a code it can search for the code entered to give the desired soda)...

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[Code] ....
 
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package abc;
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[Code] ....

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llllllll
fffffffffffff
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aaaaa
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I have already tried some of the methods, but they don't seem to work fine.

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Code:

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[Code] ....

Actually changed a little on my code and I believe strongly this should work; however, doesn't seem to. In my demo,

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This is the question^

My codes are:

public static int change (int amount) {
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[Code] .....

The codes were working when i used System.out.println instead of return, but our teacher required us to use return (functions).

I get the compile error: Unreachable statement.

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Java Code:

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[Code] ....

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