Goals

  • Present Primitive types
  • Work on passion project
  • Experiments
import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter operation (+ for addition, - for subtraction, * for multiplication): ");
        char operation = scanner.next().charAt(0);

        System.out.print("Enter first number: ");
        String num1 = scanner.next();

        System.out.print("Enter second number: ");
        String num2 = scanner.next();

        double x, y;

        if (num1.contains(".") || num2.contains(".")) {
            x = Double.parseDouble(num1);
            y = Double.parseDouble(num2);
        } else {
            x = Integer.parseInt(num1);
            y = Integer.parseInt(num2);
        }

        double result;

        switch (operation) {
            case '+':
                result = add(x, y);
                break;
            case '-':
                result = subtract(x, y);
                break;
            case '*':
                result = multiply(x, y);
                break;
            default:
                System.out.println("Invalid operation");
                return;
        }

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

    public static double add(double x, double y) {
        return x + y;
    }

    public static double subtract(double x, double y) {
        return x - y;
    }

    public static double multiply(double x, double y) {
        return x * y;
    }
}