(Feb 3, 2012 03:54 PM)Kiipa Wrote:  I'd do it like this:

Code

import java.util.Scanner;

    public static void main (String args[]){

    double fn,sn,answer=0;
    int way;

    Scanner input = new Scanner(System.in);

    System.out.println("Enter fnum");
    fn = input.nextDouble();

    System.out.println("Enter 1 for +, 2 for -, 3 for *, 4 for /");
    way = input.nextDouble();

    Sytem.out.println("Enter snum);
    sn = input.nextDouble();

    }if (way == 1){
        answer = fn + sn;

    }else if (way == 2){
        answer = fn - sn;

    }else if (way == 3){
        answer = fn * sn;

    }else if (way == 4){
        answer = fn / sn;

    //Here comes the anti-bug part

    }else if (way > 4){
        System.out.println("Enter a valid way to handle fnum and snum (under 4)");
    }else if (way < 1){
        System.out.println("Enter a valid way to handle fnum and snum (above 1)");

    //And here if someone tries to devide by zero (pfft, idiots)

    }else if (fnum == 0 && way == 4){
        System.out.println("Don't try to devide by zero...");
    }else if (snum == 0 && way == 4){
        System.out.println("Don't try to devide by zero...");
    }

    System.out.println("Your answer is: " + answer);

}

CBF testing it though, too lazy.

Basicly what it does is ask the user for a first number, then a way to handle the fnum and snum... and if you try to devide by zero you get an error...

(Feb 4, 2012 05:33 AM)eXero Wrote:  And your point is what? This is meant for new people wanting to learn to program in Java.

(Feb 21, 2010 05:12 PM)eXero Wrote:  

Java Calculator

Step 1.
1.1 Open Netbeans, and create new project.
1.2 Title it whatever you want.
1.3 Click "Finish" to start the project.
Spoiler (Click to View)
[img]http://i50.[censored].com/2lif0q9.png[/img]


Step 2.
Put this code in the program:Spoiler (Click to View)

Code

import java.util.Scanner;

/**
*
* @author eXero
*/
public class Main {

    /**
  * @param args the command line arguments
  */
    public static void main(String[] args) {
  Scanner keyboard = new Scanner(System.in);
  String operator;

  double result = 0;
  System.out.println("Please enter a number:");

  double num1 = keyboard.nextDouble();
  System.out.println("Please enter another number:");

  double num2 = keyboard.nextDouble();

  System.out.println("Enter an expression: ");
  operator = keyboard.next();
  if (operator.equals("+"))
    result = num1 + num2;
  if (operator.equals("-"))
    result = num1 - num2;
  if (operator.equals("/"))
    result = num1 / num2;
  if (operator.equals("*"))
    result = num1 * num2;
  System.out.println(num1 + operator + num2 + "=" + result);
    }

}

PIC:
Spoiler (Click to View)
[img]http://i47.[censored].com/1zldix0.png[/img]


You should now have the coding done.

Step 4.
Click "Run" and you should now have a working calculator.
Spoiler (Click to View)
[img]http://i45.[censored].com/ixyqes.png[/img]

I hope you liked my tutorial. Please give me credits for this code, and thread. Please post a reply.