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Thread: Calculator

  1. #1
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    Default Calculator

    I've just started learning Java (only my second day) but can anyone explain to me why this code doesn't work. Its code for a basic calculator every time i try to compile it says found Int but expected boolean. Thanks in advance.

    import java.util.Scanner;
    public class Calculator2{

    public static void main (String[] args){
    Scanner keyboard=new Scanner(System.in);
    int x = keyboard.nextInt();
    if(x = 1){
    System.out.print("1st number: ");
    Scanner scan = new Scanner(System.in);
    int num1 = scan.nextInt();
    System.out.print("\n2nd number: ");
    int num2 = scan.nextInt();
    int num3 = num1 + num2;
    System.out.print("\nThe answer is: " + num3);
    }
    else if(x = 2){
    System.out.print("1st number: ");
    Scanner scan = new Scanner(System.in);
    int num4 = scan.nextInt();
    System.out.print("\n2nd number: ");
    int num5 = scan.nextInt();
    int num6 = num4 - num5;
    System.out.print("\nThe answer is: " + num3);
    }
    else if(x = 3){
    System.out.print("1st number: ");
    Scanner scan = new Scanner(System.in);
    int num7 = scan.nextInt();
    System.out.print("\n2nd number: ");
    int num8 = scan.nextInt();
    int num9 = num7 * num8;
    System.out.print("\nThe answer is: " + num3);
    }
    else{
    System.out.print("1st number: ");
    Scanner scan = new Scanner(System.in);
    int num10 = scan.nextInt();
    System.out.print("\n2nd number: ");
    int nu11 = scan.nextInt();
    int num12 = num10 / num11;
    System.out.print("\nThe answer is: " + num3);
    }

    }
    }


  2. #2
    Super Moderator curmudgeon's Avatar
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    Default Re: Calculator

    The error message that you've received from the compiler will come with line numbers, and to best help us out, you should indicate for us which line is causing the compilation error. I suggest you show the actual compiler error message in its entirety, and also indicate in your code with a comment which line is causing the problem.

    edit: ah I see. Your if and else blocks will need the equality operator, ==, not the assignment operator, =

    So instead of
    else if(x = 2){

    do,
    else if(x == 2){

    this:
    x = 2
    will assign the value 2 into the x variable which is not what you're trying to do.

    whereas this:
    x == 2
    will check if x holds the value 2, a big difference.
    Last edited by curmudgeon; September 14th, 2012 at 06:18 PM.

  3. #3
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    Default Re: Calculator

    Sorry it's

    if(x = 1){

    And i'm assuming it will also occur at
    else if(x = 2){
    else if(x = 3){

    Edit: Thank you
    Last edited by Vibex; September 14th, 2012 at 06:20 PM.

  4. #4
    Super Moderator curmudgeon's Avatar
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    Default Re: Calculator

    You're welcome. Good luck with your assignment and your Java programming education!

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