Java Program For Calculator Using Switch

//File name--> Calculator.java

import java.io.*;

class Calculator{
 public static void main(String args[])throws Exception
 {
  int n1,n2;
  String choice;
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 
  System.out.println("Enter number1:");
  n1=Integer.parseInt(br.readLine());
 
  System.out.println("press \n + for addition \n - for subtraction \n * for multiplication \n /  for division: ");
  choice=br.readLine();
 
  System.out.println("Enter number2:");
  n2=Integer.parseInt(br.readLine());
  switch(choice)
  {
   case "+":   System.out.println("Addition: "+n1+"+"+n2+" is:"+(n1+n2));
      break;
   case "-":    System.out.println("Subtraction:"+n1+"-"+n2+" is:"+(n1-n2));
      break;
   case "*":   System.out.println("Multiplication:"+n1+"*"+n2+" is:"+(n1*n2));
      break;
   case "/":  if(n2==0)
            System.out.println("Division by zero is not possible");
     else
            System.out.println("Division:"+n1+"/"+n2+" is:"+(n1/n2));
     break;
  }
 }
}


OUTPUT


javac Calculator.java

java Calculator
Enter number1:
10
press
 + for addition
 - for subtraction
 * for multiplication
 /  for division:
+
Enter number2:
20
Addition: 10+20 is:30

java Calculator
Enter number1:
10
press
 + for addition
 - for subtraction
 * for multiplication
 /  for division:
-
Enter number2:
20
Subtraction:10-20 is:-10

java Calculator
Enter number1:
10
press
 + for addition
 - for subtraction
 * for multiplication
 /  for division:
*
Enter number2:
20
Multiplication:10*20 is:200

java Calculator
Enter number1:
10
press
 + for addition
 - for subtraction
 * for multiplication
 /  for division:
/
Enter number2:
2
Division:10/2 is:5