Whats the error i dont understand

Question

height=float(input())
weight=float(input())
x=weight/(height**2)
if x<18.5 :
print ("Underweight")
elif (x>=18.5 & x<=25):
print ("Normal")
elif (x>=25 & x<=30):
print ("Overweight")
else:
print ("Obesity")

Answer 1

In Python "&" is used for bitwise operations.
https://www.w3schools.com/python/python_operators.asp

Answer 2

In Python you don't use &, you should use the expression "and"

x >=18.5 and x<=25

Answer 3

your code snipped is wrong, as others already explained. Also I suggest one of following two code changes to clarify the algorithm.

With ifs you need check low and high limits of x.
if x<18.5:
print ("Underweight")
if (x>=18.5 and x<25):
print ("Normal")
If x>30:
#obesity

With elifs you just need to check high limits of x.
if x<18.5:
print ("Underweight")
elif x<25:
print ("Normal")
else:
#obesity

Either use only ifs or remove the lower limit checks at your elifs.

Answer 4

Replace the ampersand symbol with 'and'.
(Use : 'and', not '&' in your code)

Code: ...

elif (x>= 18.5 and x<=25):

Answer 5

Observe the correct order of inputs given. Yours are reversed.