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Thread: Help for simple calculator code

  1. #1
    Junior Member
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    Default Help for simple calculator code

    This code wont work for some reason. For example when i input 4+7 it says that it's 108.
    import java.util.Scanner;
     
    public class myCalculator {
        public static void main(String[] args) {
            Scanner Calculator = new Scanner(System.in);
     
            System.out.println("Plese input equation. NO DOUBLE DIGITS!");
            String calculator = Calculator.next();
     
            char[] op = calculator.toCharArray();
     
            switch(op[1]){
                case('+'):
                double stuff = (op[0] + op[2]);
                System.out.println(stuff);
                break;
     
                case('-'):
                double stuff0 = (op[0] - op[2]);
                System.out.println(stuff0);
                break;
     
                case('*'):
                double stuff1 = (op[0] * op[2]);
                System.out.println(stuff1);
                break;
     
                case('/'):
                double stuff2 = (op[0] / op[2]);
                System.out.println(stuff2);
                break;
     
                default:
                System.out.println("ERROR");
            }
        }
    }
    Last edited by Andthehand; May 15th, 2019 at 12:21 PM.

  2. #2
    Junior Member
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    Default Re: Help for simple calculator code

    It works but need input 4 char + - * /, if less then 4 char throw Exception

     
    import java.util.Scanner;
     
    public class myCalculator {
        public static void main(String[] args) {
            Scanner Calculator = new Scanner(System.in);
     
            System.out.println("Plese input equation. NO DOUBLE DIGITS!");
            String calculator = Calculator.next();
     
            char[] op = calculator.toCharArray();
     
            switch (op[1]) {
            case ('+'):
                double stuff = (op[0] + op[2]);
                System.out.println(stuff);
                break;
     
            case ('-'):
                double stuff0 = (op[0] - op[2]);
                System.out.println(stuff0);
                break;
     
            case ('*'):
                double stuff1 = (op[0] * op[2]);
                System.out.println(stuff1);
                break;
     
            case ('/'):
                double stuff2 = (op[0] / op[2]);
                System.out.println(stuff2);
                break;
     
            default:
                System.out.println("ERROR");
            }
        }
    }

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Help for simple calculator code

    wont work for some reason.
    Please explain what "wont work" means: compiler error, execution error or wrong results.
    Copy the contents of the console and paste it here that shows the problem and add some comments.

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  4. The Following User Says Thank You to Norm For This Useful Post:

    Andthehand (May 15th, 2019)

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