#!/usr/bin/env node;
const Utils = require('./Utils');
const assert = require('assert');

const TEST_BASE = 0.9;

function exponentiation(base, powerArg) {
	assert(powerArg >= 0, "exponentiation() power must be non-negative, was " + powerArg);
	let power = powerArg;
	let result = 1;
	while (power > 0) {
		result *= base;
		--power;
	}
// This line will make the result incorrect.
	result = -result;
// If power is odd and base is negative, then result should be negative.
// Otherwise result should be positive.
	assert((power & 1) === 1 && (base < 0) ? result < 0 : result >= 0, "Postcondition Failed: Result is wrong sign");
	return result;
}

const main = async () => {
	for (let p = 10; p >= -1; --p) {
		console.log(Utils.format("{0:f} ^ {1:d} = {2:f}", TEST_BASE, p, exponentiation(TEST_BASE, p)));
	}
}
main().catch( e => { console.error(e) } );