Question

Write a program to develop a calculator.(using all operators : +, /, -, *, %) in java ​

Answer 1

JAVA PROGRAM TO DEVELOP A CALCULATOR USING SWITCH CASE

import java.util.Scanner;

public class Calculator {

   public static void main(String[] args) {

     Scanner reader = new Scanner(System.in);

       System.out.print("Enter two numbers: ");

       // nextDouble() reads the next double from the keyboard

       double first = reader.nextDouble();

       double second = reader.nextDouble();

       System.out.print("Enter an operator (+, -, *, /): ");

       char operator = reader.next().charAt(0);

       double result;

       switch(operator)

       {

           case '+':

               result = first + second;

               break;

           case '-':

               result = first - second;

               break;

           case '*':

               result = first * second;

               break;

           case '/':

               result = first / second;

               break;

           // operator doesn't match any case constant (+, -, *, /)

           default:

               System.out.printf("Error! operator is not correct");

               return;

       }

        System.out.printf("%.1f %c %.1f = %.1f", first, operator, second, result);

   }

}