Calculator Using Switch Statement in Java

 Machine Problem

 Write a Java program that will use the MDAS Operation to  * calculate integers. “Use switch Statement” using Java programming language.

  Sample Program Output

  Operator (+,-,*,/)

 Choose Operator : +

  Enter First Number: 10

  Enter Second Number: 1

  10 + 1 = 11

  Operator (+,-,*,/)

 Choose Operator : –

  Enter First Number: 10

  Enter Second Number: 1

  10 – 1 = 9

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Program Listing

package test;

import java.util.Scanner;


/*
 * Calculator.java
 * 
 * Jake Rodriguez Pomperada, MAED-IT, MIT
 * www.jakerpomperada.com  and www.jakerpomperada.blogspot.com
 * jakerpomperada@gmail.com
 * Bacolod City, Negros Occidental Philippines
 * 
 * Machine Problem
 * 
 * Write a Java program that will use the MDAS Operation to
 * calculate integers. "Use switch Statement"
 * 
 * Sample Program Output
 * 
 * Operator (+,-,*,/)
 * Choose Operator : +
 * Enter First Number: 10
 * Enter Second Number: 1
 * 10 + 1 = 11
 * 
 * Operator (+,-,*,/)
 * Choose Operator : -
 * Enter First Number: 10
 * Enter Second Number: 1
 * 10 - 1 = 9
 */

public class Calculator {
	
	public static void main(String[] args) {

	char operator;
    int number1, number2, result;

    // create an object of Scanner class
    Scanner input = new Scanner(System.in);

    // ask users to enter operator
    System.out.println();
    System.out.println("+,=,*,/");
    System.out.print("Choose Operator : ");
    operator = input.next().charAt(0);

    // ask users to enter numbers
    System.out.print("Enter First Number : ");
    number1 = input.nextInt();

    System.out.print("Enter Second Number : ");
    number2 = input.nextInt();

    switch (operator) {

      // performs addition between numbers
      case '+':
        result = number1 + number2;
        System.out.println(number1 + " + " + number2 + " = " + result);
        break;

      // performs subtraction between numbers
      case '-':
        result = number1 - number2;
        System.out.println(number1 + " - " + number2 + " = " + result);
        break;

      // performs multiplication between numbers
      case '*':
        result = number1 * number2;
        System.out.println(number1 + " * " + number2 + " = " + result);
        break;

      // performs division between numbers
      case '/':
        result = number1 / number2;
        System.out.println(number1 + " / " + number2 + " = " + result);
        break;

      default:
        System.out.println("Invalid operator!");
        break;
    }

    input.close();
  }
}