Can't float be used in while loop

Question

Input

x=999.0
while x>=1.0:
x-=0.5

Output

999.0
999.0
999.0
...till timed out

Why is this happening

Answer 1

its valid (kinda)

x=999.0
while x>=1.0:
print(x)
x-=0.5

Answer 2

You forgot to add a space in the third line, so the while loops serves no purpose and x will always be 999