自动售货机程序java

Question

在我的这个自动售货机代码中，如果我输入了多余的资金，它不会把零钱还给我。我在这里错过了什么？

public static void main(String[] args) {
    int Food = runMenu();
    int Price = retrievePrice(Food);
    int change = moneyInserted(Price);
}

public static int runMenu(){
    Scanner keyboard = new Scanner(System.in);
    int choice = 0 ;
    System.out.println("\n\nPlease enter your selection:"
                + "\n1: Snickers \t 125"
                + "\n2: Reeses Cup \t 130"
                + "\n3: Doritoes \t 150"
                + "\n4: Pepsi \t 185"
                + "\n5: Exit ");
    choice = keyboard.nextInt();
    return choice;        
}

public static int retrievePrice(int menuChoice){
    if (menuChoice == 1)
        return 125;
    if (menuChoice == 2)
        return 130;
    if (menuChoice == 3)
        return 150;
    if (menuChoice == 4)
        return 185;
    else return 0;
}

public static int moneyInserted(int Price){
    Scanner keyboard = new Scanner(System.in);
    int money = 0;
    System.out.println("Your item costs: " + Price + " Please enter the amount of money:");
    money = keyboard.nextInt();
    while (money < Price){
        System.out.println("Please insert sufficient funds");
        money = money + keyboard.nextInt();
    }
    return money - Price ;
}

public static void changeOut(int change){
    int quarters = 0;
    int dimes = 0;
    int nickels = 0;
    while (change >= 25){
        quarters = quarters + 1;
        change = change - 25;
    }
    while (change >= 10){
        nickels = dimes + 1;
        change = change - 10;
        while (change >= 5){
            nickels = nickels + 1;
            change = change - 5;
        }
    }
}

Answer 1

您的代码确实返回了更改，只是您没有使用它。

像这样修改你的代码：

1. 计算 change 后，将其传递给您的 changeOut() 方法，该方法在您的代码中进行更改计算。为此，请将此行添加到 main() 方法的末尾：

   changeOut(change);
   

2.您的changeOut() 方法存在轻微的逻辑错误。修改如下：

public static void changeOut(int change){
    int quarters = 0;
    int dimes = 0;
    int nickels = 0;
    while (change >= 25){
        quarters = quarters + 1;
        change = change - 25;
    }
    while (change >= 10){
        dimes = dimes + 1;
        change = change - 10;
    }
    while (change >= 5){
        nickels = nickels + 1;
        change = change - 5;
    }

    // to see the change, print it to the console perhaps
    System.out.printf("\nHere's your change:\n%d quarters, %d dimes, %d nickels and %d pennies!",
        quarters, dimes, nickels, change);
}

Answer 2

private static int totalNotes = 0;
private static int amount = 0;

private static void printAmount(int maxAmt) {
    amount = amount - maxAmt;
    totalNotes++;
    System.out.print(maxAmt + "-");
}

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter Amount");
    amount = scanner.nextInt();
    int maxAmt = 0;

    while (amount != 0) {
        if (amount >= 2000) {
            maxAmt = 2000;
        } else if (amount >= 500) {
            maxAmt = 500;
        } else if (amount >= 200) {
            maxAmt = 200;
        } else if (amount >= 100) {
            maxAmt = 100;
        } else if (amount >= 50) {
            maxAmt = 50;
        } else if (amount >= 20) {
            maxAmt = 20;
        }
        // as same you can do this for
        /*10, 5, 2, 1*/
        printAmount(maxAmt);
    }
    System.out.println("\nTotal notes : " + totalNotes);
}