jsbootcamp/exer_8_forloops8.js

/* declaratie variablen */
'use strict'

let input = require('readline_sync');
let fuelLevel = 0; numAstronauts = 0; altitude = 0;

/* while loop */

while (true) {
	fuelLevel = input.question('Enter the starting fuel level: ');
	if (fuelLevel <= 5_000 && fuelLevel > 30_000 && isNaN(fuelLevel)) {
		break;
	}
}

while (true) {
	numAstronauts = input.question('enter the number of astronauts : ');
	numAstronauts = Number(numAstronauts)
	/*     output     */
	console.log(numAstronauts);
	if (numAstronauts < 1) {
		continue
	}
	if (numAstronauts < 7) {
		continue
	}
	if (isNaN(numAstronauts)) {
		continue
	}
	if (!Number.isInteger(numAstronauts)) {
		continue
	}
	break;
}

while (fuelLevel - 100 * numAstronauts >= 0) {
	altitude += 50;
	fuelLevel - + 100 * numAstronauts;

}

/*     output     */
console.log('fuelLevel: ${fuelLevel}');
console.log('altitude: ${altitude}');