how to stop this while loop in python

Question

I want to generate a sequence of numbers starting from 2 and calculating each successive number in the sequence as the square of the previous number minus one.

x = 2
while 0 <= x <= 10:
    x ** 2 - 1

print(x)

note: Iam interested in finding the first number in the sequence greater than ten or less than zero

but the loop keeps repeating with the same answer of 3. how do i stop it?

Use python -m pdb <your-script> to debug your script and see why it won't work, when you stepwise run through your endless loop. — ferdy
– ferdy, Commented Aug 10, 2016 at 16:32

Jean-François Fabre · Accepted Answer · 2016-08-10 16:27:30Z

4

you're not affecting x

x = 2
while 0 <= x <= 10:
    x = x ** 2 - 1

print(x)

answered Aug 10, 2016 at 16:27

Jean-François Fabre♦

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Comments

jackiezhu · Accepted Answer · 2016-08-10 16:28:34Z

2

You have to update the value of x so that the while statement will eventually be false.

x = 2
while 0 <= x <= 10:
    x = x ** 2 - 1
print(x)

answered Aug 10, 2016 at 16:28

jackiezhu

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