java.lang.ArithmeticException: / by zero | Java Community | Help. Code. Learn. | Page 1

quasi zealot Apr 29, 2023, 5:02 AM

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Method call in main() is exactChange(userIn, coinValues) with userIn simply being scnr.nextInt() and int[] coinValues being an array with values {1, 5, 10, 25}
(literally nothing else of importance is in main() aside from those 3 things mentioned)


        int numQuarters = userTotal / coinVals[3];

        int numDimes = (userTotal - (coinVals[3] * numQuarters)) / coinVals[2];

        int numNickels = ((userTotal - (coinVals[3] * numQuarters)) - coinVals[2] * numDimes) / coinVals[1];

        int numPennies = (((userTotal - (coinVals[3] * numQuarters)) - coinVals[2] * numDimes) - coinVals[1] * numNickels) / coinVals[0];

        if (numPennies > 1) {System.out.println(numPennies + " pennies"); }
        else if (numPennies == 1) {System.out.println(numPennies + " penny"); }

        if (numNickels > 1) { System.out.println(numNickels + " nickels"); }
        else if (numNickels == 1) { System.out.println(numNickels + " nickel"); }

        if (numDimes > 1) { System.out.println(numDimes + " dimes"); }
        else if (numDimes == 1) { System.out.println(numDimes + " dime"); }

        if (numQuarters > 1) { System.out.println(numQuarters + " quarters"); }
        else if (numQuarters == 1) { System.out.println(numQuarters + " quarter"); }

    } ```
Typed this up, while yes for homework, and ran it just fine on VSC, but upon throwing it to the auto-grader it threw the division by 0 error even though none of the array values, which are mainly used as the denominators, are 0. So any possible ideas why it could be throwing a / by zero exception? Not asking for a "do this" answer, though any pointers or nudges would be helpful and appreciated cause I think I've rewritten the calculations like 3 times.

random latchBOT Apr 29, 2023, 5:02 AM

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strong jewel Apr 29, 2023, 8:22 AM

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well, what line is it erroring on

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(also use modulo for cleaner code)

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also is the exactChange method specified by the assignment? if so, it may be passing in its own coinVals for testing

random latchBOT Apr 29, 2023, 1:30 PM

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quasi zealot Apr 29, 2023, 2:44 PM

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Afraid cant give specific line as yes it passes its own thing, example being exactChange(300, coinVals), and it doesnt give a specific line, just throws the error

strong jewel Apr 29, 2023, 2:45 PM

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does the assignment maybe require you to check the array passed?

quasi zealot Apr 29, 2023, 2:47 PM

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I do not think so, though maybe could work. All it specifies regarding the coinVals array is that index 0 = 1 (pennies), 1 = 5 (nickels), 2 = 10 (dimes) and 3 = 25 (quarters)

strong jewel Apr 29, 2023, 2:47 PM

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could you show the problem statemennt

quasi zealot Apr 29, 2023, 2:48 PM

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Like the specific instruction? Assuming so, sure gimme a sec to boot pc, just woke up

strong jewel Apr 29, 2023, 2:49 PM

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good morning

quasi zealot Apr 29, 2023, 2:52 PM

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heres the instructions plus example i/o

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and heres the 2 calls it tries to do and then errors on

strong jewel Apr 29, 2023, 2:54 PM

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looks like you're misunderstanding what exactChange does

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read the problem statement again

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separate out which parts are the inputs and outputs, make sure to not confuse what the main method does vs what the exactChange method does

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hint: ||coinVals is an output, not an input||

quasi zealot Apr 29, 2023, 3:05 PM

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strong jewel separate out which parts are the inputs and outputs, make sure to not confuse wh...

NOTED
though, main only consists of this

        Scanner input = new Scanner(System.in);

        final int[] coinValues = {1, 5, 10, 25};

        int changeIn = input.nextInt();
        if (changeIn <= 0) {
            System.out.println("no change");
        }
        else {
            exactChange(changeIn, coinValues);
        }
        input.close();
    }```

strong jewel Apr 29, 2023, 3:12 PM

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right it's not supposed to be just that

quasi zealot Apr 29, 2023, 3:22 PM

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THONK imma ask directly and ask "whats it supposed to look like then"
and finally realized coinValues was supposed to be an empty array, which led to getting the 10/10 finally

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        userTotal %= 25;

        int numDimes = userTotal / 10;
        userTotal %= 10;

        int numNickels = userTotal / 5;
        userTotal %= 5;```
and as requested heres the modulo

quasi zealot Apr 29, 2023, 3:24 PM

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quasi zealot <:THONK:442446969886081034> imma ask directly and ask "whats it supposed to look...

either way thanks for nudgin me, think i skipped over that "stores the number of each coin type used into the array parameter" too many times 😓

random latchBOT Apr 29, 2023, 3:24 PM

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quasi zealot either way thanks for nudgin me, think i skipped over that "stores the number of...

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#java.lang.ArithmeticException: / by zero