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Thread: Making a vending machine, trouble asking user to insert more money.

  1. #1
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    Question Making a vending machine, trouble asking user to insert more money.

    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;
    //boolean bool = true;

    Scanner scan = new Scanner (System.in);

    do {

    total = calTotal();
    if (total > 0 && total < 20)
    System.out.println("You entered: " + total );

    else
    System.out.println("Please restart and enter a proper ammount");

    System.out.println("\nPlease make a drink selection: \n"
    + "1 = Coke ($1.25)\n2 = Sprite($1.00)\n3 = DrPepper($1.35)\n4 = Pepsi($1.25)\n5 = Fanta($.75)"
    + "\n6 = Water($1.50)");
    selection = scan.nextInt();

    //insuf();

    if (total < selection)
    System.out.println("Please enter correct ammount \n\n");

    if (selection == 1){
    System.out.println("You selected: Coke\n\n");
    if (total < 1.25)
    {
    System.out.println("Please enter more money");
    System.out.println("How much would you like to add?");
    }
    change = total - 1.25;
    System.out.println("Your change is $" + change + "\n\n");

    }

    else if (selection == 2)
    {
    System.out.println("You selected: Sprite\n\n");
    change = total - 1;
    System.out.println("Your change is $:" + change + "\n\n");
    }

    else if (selection == 3)
    {
    System.out.println("You selected: DrPepper\n\n");
    change = total - 1.35;
    System.out.println("Your change is $:" + change + "\n\n");
    }

    else if (selection == 4)
    {
    System.out.println("Your choice was Pepsi");
    change = total - 1.25;
    System.out.println("Your change is $:" + change + "\n\n");
    }

    else if (selection == 5)
    {
    System.out.println("Your choice was Fanta");
    change = total - .75;
    System.out.println("Your change is $:" + change + "\n\n");
    }
    else if (selection == 6)
    {
    System.out.println("Your choice was Water");
    change = total - 1.50;
    System.out.println("Your change is $:" + change + "\n\n");
    }
    else
    System.out.println("Please enter valid selection.");

    System.out.println("Would you like to order another drink? (1 = y / 2 = n)");
    i = scan.nextInt();
    System.out.println("\n \n \n");
    } while (i == 1);

    }
    static double calTotal()
    {
    Scanner scan = new Scanner (System.in);
    double dollar, quarters, dimes, nickles, pennies, total;
    System.out.println("Please enter ammount of Dollars, Quarters, Dimes, Nickles,"
    + " and Pennies you will be entering: ");
    dollar = scan.nextInt();
    quarters = scan.nextInt();
    dimes = scan.nextInt();
    nickles = scan.nextInt();
    pennies = scan.nextInt();

    total = (1 * dollar) + (.25 * quarters) + (.10 * dimes) + (.05 * nickles) + (.01 * pennies);
    return(total);
    }
    }
    Attached Files Attached Files


  2. #2
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    Default Re: Making a vending machine, trouble asking user to insert more money.

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly using code or highlight tags per the above link.

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