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Thread: Java calculator using swing and applet

  1. #1
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    Default Java calculator using swing and applet

    import java.io.*;
    import java.util.*;
    import javax.swing.JOptionPane;

    public class exercise1
    {

    public static void main(String args[]){
    String input = JOptionPane.showInputDialog("Selection from the choices below:\n\n 1. Addition\n 2. Subtraction\n 3. Multiplication\n 4. Division\n 5. Modulo\n\n Your choice?");


    JOptionPane.showInputDialog("\nEnter first number: ");
    float x = kbReader.nextFloat();
    JOptionPane.showInputDialog("Enter second number: ");
    float y = kbReader.nextFloat();


    Scanner kbReader = new Scanner(System.in);
    int choice = kbReader.nextInt();


    if((choice<=5) && (choice>0))
    {

    switch (choice)
    {

    case 1: //addition 1 decimal
    System.out.println(x + " plus " + y + " = " + (x + y) );
    break;

    case 2: //subtraction no decimal
    System.out.println(x + " minus " + y + " = " + (x - y) );
    break;

    case 3: //multiplication 3 decimal
    System.out.println(x + " times " + y + " = " + (x * y) );
    break;

    case 4: //division 4 decimal
    System.out.println(x + " divided by " + y + " = " + (x / y) );
    break;

    case 5: //modulo
    System.out.println(x + " modulo " + y + " = " + (x % y) );
    //break;
    }

    }
    else
    {
    System.out.println("Please enter a 1, 2, 3, 4 or 5.");
    }
    }
    }

    --- Update ---

    please help me solve my code its for my final exam. the code doesn't continue to its input number


  2. #2
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    Default Re: Java calculator using swing and applet

    Hello.
    You are first reading the operation using JOptionpane. So you don't need Scanner anymore.
    Just replace the scanner code with this line. It should work.
    //Scanner kbReader = new Scanner(System.in);
    //int choice = kbReader.nextInt();

    int choice=Integer.parseInt(input);

    Thats it.

    Thanks,
    Syed.

  3. #3
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    Default Re: Java calculator using swing and applet

    Quote Originally Posted by syedbhai View Post
    Hello.
    You are first reading the operation using JOptionpane. So you don't need Scanner anymore.
    Just replace the scanner code with this line. It should work.
    //Scanner kbReader = new Scanner(System.in);
    //int choice = kbReader.nextInt();

    int choice=Integer.parseInt(input);

    Thats it.

    Thanks,
    Syed.
    tons of thanks sir. now my problem is how to convert those int to float and displays required decimal places.

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    Default Re: Java calculator using swing and applet

    Quote Originally Posted by lordrey View Post
    tons of thanks sir. now my problem is how to convert those int to float and displays required decimal places.
    What did you try?
    Your homework is meant for you to figure out, to give you the ability to solve the problem. Not to see how someone on a forum would solve the problem.

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