Calculator.java

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args){

        
        try (Scanner sc = new Scanner(System.in)) {
            double num1 , num2;
            char oper;
            double result = 0.0;

            System.out.print("Enter first number : ");
            num1 = sc.nextInt();
            System.out.println();

            System.out.print("Enter second number : ");
            num2 = sc.nextInt();
            System.out.println();

            System.out.println("Make sure that num2 should not be equal to 0 in case of operator '/' as it is not defined.");
            System.out.print("Enter operator (+,-,*,/) : ");
            oper = sc.next().charAt(0);
            System.out.println();

            
            switch(oper){
                case '+' : result = num1 + num2;
                break;

                case '-' : result = num1 - num2;
                break;

                case '*' : result = num1 * num2;
                break;

                case '/' : result = num1 / num2;
                break;

                default : System.out.println("Invalid operator");
            }
            System.out.println("Result : "+result);
        }
    }
    
}