Question

^{Please make a JAVA program for the following using switch structures}

Write a program that simulates a simple Calculator program. The program will display menu choices to the user to Add, Subtract, Multiply and Divide. The program will prompt the user to make a selection from the choices and get their choice into the program. The program will use a nested if….else (selection control structure) to determine the user’s menu choice. Prompt the user to enter two numbers, perform the appropriate computation and display the results on the screen (you can use dialog boxes if you want). If the user inputs an invalid menu choice, the program will display the user’s entry with an error message.

Calculator Program

-----------------------------------------------------------------------

        A: Add

B: Subtract

C: Multiply

        D: Divide

        X: Exit

-----------------------------------------------------------------------

            Please make a selection: A

            Please enter the first number: 10

            Please enter the second number: 15

            10 + 15 = 25

Calculator Program

-----------------------------------------------------------------------

        A: Add

B: Subtract

C: Multiply

        D: Divide

        X: Exit

-----------------------------------------------------------------------

            Please make a selection: C

            Please enter the first number: 10

            Please enter the second number: 10

            10 + 10 = 100

Answer 1

CODE:

import java.lang.*;
import java.util.Scanner;
public class Calculator
{
   public static void main(String[] args) {
       Scanner sc=new Scanner(System.in);
       char option;
       do{
           System.out.println("Calculator Program");
           System.out.println("----------------------------------------");
           System.out.println("A:Add\nB:Subtract\nC:Multiply\nD:Divide\nX:Exit");
           System.out.print("Please Make a selection : ");
           option=sc.next().charAt(0);//Taking character input from user
           if(option!='X'){
               int a,b;
               System.out.print("Please enter first number: ");
               a=sc.nextInt();
               System.out.print("Please enter second number: ");
               b=sc.nextInt();
               switch(option){
                   case 'A':
                       System.out.println(a+" + "+b+" = "+(a+b));
                       break;
                   case 'B':
                       System.out.println(a+" - "+b+" = "+(a-b));
                       break;
                   case 'C':
                       System.out.println(a+" * "+b+" = "+a*b);
                       break;
                   case 'D':
                       System.out.println(a+" / "+b+" = "+a/b);
                       break;
               }
           }
       }while(option!='X');//Iterating until he presses X

   }
}

OUTPUT: