Narkoman Circus

// task 1
var age, group;
while((age = (prompt())) == null || isNaN(age = Number(age)) || age > 120 || age < 0);
group = age < 18 ? 'student' : age < 70 ? 'worker' : 'retired';
console.log(group);


// task 2
var i = 0, s = 0, r;
while((r = Math.round(Math.random()*10)) != 0 && (i += 1) && (s += r));
console.log(s/i);

// task 3
var car = 100, cargo = 0;
while((cargo += Number(prompt()) || 0) && cargo < 100);

// task 4
var x = 81, y = 99;
while((x != y) && ((x > y) ? x -= y : y -= x));
console.log(x);

// task 5
var x = 2868, h;
while((h = (x % 10)) && (h % 2 == 0) && (x = (x-h) / 10));
console.log(x == 0);