Controlling Do...While() Loop with int variable isn't working

Question

Edit: Issue was I didn't declare variables outside it

My loop cannot resolve an int as a variable.

Can't try other types of variables, this has to be an integer.

        do {
            System.out.println("Would you like to add any snacks? ");
            System.out.println("1: ($5) Large Popcorn");
            System.out.println("2: ($0) Nothing Else");
            int snackChoice = input.nextInt();

            System.out.println("How many of option " + snackChoice + " would you like? ");
            System.out.println("1: One");
            System.out.println("2: Two");
            System.out.println("3: Three");
            System.out.println("4: Four");
            System.out.println("5: Five");
            int snackAmount = input.nextInt();

            switch (snackChoice) { 
            case 1: 
                cost = cost + 5 * snackAmount;
                System.out.println("Your total before tax will be: $" + cost + (5 * snackAmount)); 
            break;

            default: 
                System.out.println("Not a valid option."); 
            break;

            }
        }
        while(snackChoice != 9);

Rest of it: https://pastebin.com/Y6Xd24D0

It works. Actual result: It doesn't.

Errors: snackChoice cannot be resolved to a variable

Malt · Accepted Answer · 2019-10-01 00:05:22Z

3

the do...while loop is a code block, which means that variables defined in it cannot be seen outside the block. The while part is outside the block, so it cannot see snackChoice.

Just define int snackChoice before the do...while, not in it:

int snackChoice;
do {
    System.out.println("Would you like to add any snacks? ");
    System.out.println("1: ($5) Large Popcorn");
    System.out.println("2: ($0) Nothing Else");
    snackChoice = input.nextInt();

    System.out.println("How many of option " + snackChoice + " would you like? ");
    System.out.println("1: One");
    System.out.println("2: Two");
    System.out.println("3: Three");
    System.out.println("4: Four");
    System.out.println("5: Five");
    int snackAmount = input.nextInt();

    switch (snackChoice) { 
    case 1: 
        cost = cost + 5 * snackAmount;
        System.out.println("Your total before tax will be: $" + cost + (5 * snackAmount)); 
    break;

    default: 
        System.out.println("Not a valid option."); 
    break;

    }
}
while(snackChoice != 9);

edited Oct 1, 2019 at 0:05

answered Sep 30, 2019 at 23:48

Malt

30.5k10 gold badges73 silver badges115 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

5HT2 Over a year ago

I have snackChoice 9 to exit the loop, is there another way I can exit the loop with a choice? I need the user to be able to choose as many snacks and quantities as they want.

Malt Over a year ago

That's fine. Just define the variable itself before the do { statement - so it'll exist ouside the do..while block

Malt Over a year ago

@BellaStallman There, I've added the modified code to my answer.

5HT2 Over a year ago

Alright thank you. When running, and I try option 9 now, it asks me how many I'd like. No matter which option I choose (1, 5, 12) it gives me invalid option and asks again. How can I exit this properly now?

Collectives™ on Stack Overflow

Controlling Do...While() Loop with int variable isn't working

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related