sqrt.js

var p = console.log.bind(console);
var q = require('readline-sync').question;
var r = () => Math.floor(Math.random()*15)+1
var i = 1;
for(;;) {
	var x = r();
	p(`(${i}) ${Math.pow(x, 2)}`);
	var a = parseInt(q('Input the answer: '));
	var c = a === x;
	p(c ? 'Good!' : `Bad: The correct answer is ${x}`);
	i++;
}