Switch case java pro

Switch case statement for calculator

import java.io.*;

class calculatorEx

{

public calculatorEx()

 {

      System.out.println("constructor invoked");

}

 public void calc()

 { 

 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

               int a, b,c, d,ch;

               try

               {

               System.out.println("Enter the value of a");

               a = Integer.parseInt(br.readLine());

               System.out.println("Enter the value of b");

               b = Integer.parseInt(br.readLine());

               System.out.println("Enter the value of c ");

               c = Integer.parseInt(br.readLine());

               System.out.println("\n-----Main Menu-----\n");

               System.out.println("1.Addition");

               System.out.println("2.Multiplication");

               System.out.println("3. Subtraction");

               System.out.println("4. Average");

               System.out.println("------------------------------------------------------------------------");

               System.out.println("\nEnter the function which u want to perform\n");

               ch = Integer.parseInt(br.readLine());

                 switch(ch)

               {

                   case '1':

                   d = a + b + c;

                   System.out.println("The result is " + d);

                   break;

                  case '2' :

                   d = a * b * c;

                   System.out.println("The result is " + d);

                   break;

                   case '3' :

                    d = a - b - c;

                    System.out.println(" The result is" + d);

                     break;

                     case '4':

                    d = a + b + c/2;

                    System.out.println("The result is " + d);

                    break;

                    default:

                    System.out.println(" Oops! wrong choice");

                        break;

                     } 

               }

               catch(IOException ca)

               {

                   System.out.println("Exception caught" + ca);

               }

         }

               public static void main(String ar[])

              {

                   calculatorEx calc1 = new calculatorEx();

                   calc1.calc();

        }

}

A simple java calculator based on switch case

public class Cal

{

public static void main(String args[])throws Exception

{

int a,b,c=0;

BufferedReader br=new BufferedReader(new InputStreanreader(System.in));

System.out.println(“Enter 1st number”);

a=Integer.parseInt(br.readLine());

b=Integer.parseInt(br.readLine());

System.out.println(“\nMENU\n1.Add\n2.Subtract\n3.Multiply\n4.Devide\nEnter your choice:”);

int ch=Integer.parseInt(br.readLine());

switch(ch)

{

case 1: c=a+b;

break;

case 2:c=a-b;

break;

case 3:c=a*b;

break;

case 4:c=a/b;

break;

default: System.out.println(“Wrong Choice”);

}

System.out.println(c);

}

}