#! /usr/bin/env node

import readline from 'readline';

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

function calculate(operation: string, num1: number, num2: number): number | string {
    switch (operation) {
        case '+':
            return num1 + num2;
        case '-':
            return num1 - num2;
        case '*':
            return num1 * num2;
        case '/':
            return num2 !== 0 ? num1 / num2 : "Cannot divide by zero";
        default:
            return "Invalid operation";
    }
}

rl.question('Enter the first number: ', (firstInput) => {
    const num1 = parseFloat(firstInput);

    rl.question('Enter an operation (+, -, *, /): ', (operation) => {

        rl.question('Enter the second number: ', (secondInput) => {
            const num2 = parseFloat(secondInput);

            const result = calculate(operation, num1, num2);

            console.log(`Result: ${result}`);

            rl.close();
        });
    });
});