Why does this while loop loop forever?

Question

I have tried looking at documentation and could not figure it out. My while loop does not stop and prints "ya" forever. What am I doing wrong?

var ya = 1;
Formitivegrades = [100, 95, 100, 85, 100]
Formitiaveav1 = Formitivegrades[0] + Formitivegrades[1] + Formitivegrades[3] + Formitivegrades[4] + Formitivegrades[2]
Formitiaveav2 = Formitiaveav1 / 5

sumgrades = [100]
sumav1 = ya + sumgrades[0]
sumav2 = sumav1 / 2

averge = .4 * Formitiaveav2 + .6 * sumav2

while(averge < 95){
    console.log(ya)
    ya++;
}

console.log(averge)

averge will always be 68.7 and It is not changing, so the loop runs forever. — DecPK
– DecPK, Commented Aug 22, 2021 at 1:23

John Kugelman · Accepted Answer · 2021-08-22 01:25:26Z

1

Don't think of the equal sign = as an equality that is guaranteed forever, the way it is in mathematics. In programming it is a one-time assignment. An assignment statement gives a variable a new value at that moment in time only. If they change values afterwards the equality can be broken.

If ya is updated that does not cause sumav1 to be recalculated. Nor does sumav2 change whenever sumav1 changes, nor avrge when sumav2 changes. averge keeps the same value forever unless you explicitly update it.

To that end, you need to recompute all of the variables each time you change ya. That way averge can eventually reach 95 and cause the loop to end.

while(averge < 95){
    console.log(ya)
    ya++;

    sumav1 = ya + sumgrades[0]
    sumav2 = sumav1 / 2
    averge = .4 * Formitiaveav2 + .6 * sumav2
}

answered Aug 22, 2021 at 1:25

John Kugelman

365k70 gold badges555 silver badges600 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Why does this while loop loop forever?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related