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();

  }

}