Why is this code giving error:time limit exceeded i but adding that extra code it works

Question

a=int(input())
b=1
while a>0:
b=b*a
a=a-1
print(b)

Output:time limit exeeded

a=int(input())
b=1
while a>0:
b=b*a
a=a-1
print(b)

Output :wrong, is not factorial...

a=int(input())
b=1
while a>0:
b=b*a
a=a-1
a=a-1
print(b)

Output:its working

So why it works the last time.. I coudnt underatand the logic.. Please somebody explain

Answer 1

You're welcome mate, but is it working now? especially the second or third? if you still unsure you are welcome to ask away ... 😁

Answer 2

The first one triggers time limit because the `a = a - 1` wasn't indented, <a> was never decremented in the loop, because that line where <a> was decremented was out of while loop block.

The second and third are the same, except for the extra `a = a - 1` line before the <b> value is printed. That extra line doesn't change <b> value at all, because it is out of loop block. I tested the second and third with input 5 and got good result (120), I am not sure what you mean by the second one is not giving the factorial of the input, can you tell what input and results you get from the second and third code?

Answer 3

Hello thank you for your reply....
Ya i checked the code again and its working.. I dont know why it didn't gave me the answer... maybe some mistake in the way i entered when i first tested it..... And i m just new to it..!