Basic Calculator Program Using Java

// Java program for simple calculator
import java.io.*;
import java.lang.*;
import java.lang.Math;
import java.util.Scanner;

// Driver class
public class BasicCalculator {
    // main function
    public static void main(String[] args)
    {
        // Stores two numbers
        double num1, num2;

        // Take input from the user
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the numbers:");

        // Take the inputs
        num1 = sc.nextDouble();
        num2 = sc.nextDouble();

        System.out.println("Enter the operator (+,-,*,/):");

        char op = sc.next().charAt(0);
        double o = 0;

        switch (op) {
        // case to add two numbers
        case '+':
            o = num1 + num2;
            break;

        // case to subtract two numbers
        case '-':
            o = num1 - num2;
            break;

        // case to multiply two numbers
        case '*':
            o = num1 * num2;
            break;

        // case to divide two numbers
        case '/':
            o = num1 / num2;
            break;

        default:
            System.out.println("You enter wrong input");
        }

        System.out.println("The final result:");
        System.out.println();

        // print the final result
        System.out.println(num1 + " " + op + " " + num2
                           + " = " + o);
    }
}