Program Mencari Akar Persamaan Kuadrat dengan JavaScript (Console)

const a = parseInt(prompt("Masukan nilai a : "));
const b = parseInt(prompt("Masukan nilai b : "));
const c = parseInt(prompt("Masukan nilai c : "));

console.log("\nBentuk Persamaan :");
console.log(`${a}x^2 + ${b}x + ${c} = 0`);

console.log("\nAkar-Akar Persamaan Kuadratnya adalah :");
const D = (b * b) - (4 * a * c);

if (D > 0) {
    const x1 = (-b + Math.sqrt(D)) / (2 * a);
    const x2 = (-b - Math.sqrt(D)) / (2 * a);
    console.log("X1 =", x1);
    console.log("X2 =", x2);
} else if (D === 0) {
    const x1 = (-b + Math.sqrt(D)) / (2 * a);
    const x2 = x1;
    console.log("X1 =", x1);
    console.log("X2 =", x2);
} else {
    console.log("\nAkar Imajiner");
}

const readline = require('readline');

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

rl.question("Masukkan nilai a : ", (a) => {
    rl.question("Masukkan nilai b : ", (b) => {
        rl.question("Masukkan nilai c : ", (c) => {

            a = parseFloat(a);
            b = parseFloat(b);
            c = parseFloat(c);

            console.log("\nBentuk Persamaan :");
            console.log(`${a}x^2 + ${b}x + ${c} = 0`);

            console.log("\nAkar-Akar Persamaan Kuadratnya adalah :");
            const D = (b * b) - (4 * a * c);

            if (D > 0) {
                const x1 = (-b + Math.sqrt(D)) / (2 * a);
                const x2 = (-b - Math.sqrt(D)) / (2 * a);
                console.log("X1 =", x1);
                console.log("X2 =", x2);

            } else if (D === 0) {
                const x1 = (-b) / (2 * a);
                console.log("X1 = X2 =", x1);

            } else {
                console.log("\nAkar Imajiner");
            }

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