import java.util.Scanner;

public class StaticWay {

public static void main(String[] args) {

int a = 100;

int b = 200;

Calculator calc = new Calculator();

System.out.println("add");

System.out.println("subtract");

System.out.println("multiply");

System.out.println("divide");

System.out.println("Type Operation Name");

Scanner scanner = new Scanner(System.in);

String operation = scanner.next();

int result = 0;

switch(operation){

case "add":

result= calc.add(a, b);

break;

case "subtract":

result=calc.subtract(a, b);

break;

case "multiply":

result=calc.multiply(a, b);

break;

case "divide":

result=calc.divide(a, b);

break;

}

System.out.println("Result is "+result);

}

}