# [Tutor] python help!

Sat Feb 9 20:04:58 CET 2013

```Hi guys can you tell me what is wrong with the second part of this code(elif choice == '2'). When I type something other than 0-255, it correctly asks again for an input but when I enter a number from 0-255 it does nothing :

print("=======================")
print("1-binary to denary")
print("2-denary to binary")
print("3-exit")
print("=======================")

while True:

choice = input("please enter an option: ")

if choice == '1':
binary = input("Please enter a binary number: ")
denary = 0
place_value = 1

for i in binary [::-1]:
denary += place_value * int(i)
place_value *= 2

print("The result is",denary)

elif choice == '2':
denary2 = int(input("Please enter a denary number: "))
remainder = ''
while denary2 not in range(0,256):
denary2 = int(input("Please enter a denary number: "))
continue
while denary2 in range(0,256):

remainder = str(denary2 % 2) + remainder
denary2 >>= 1
print("The result is",remainder)

elif choice == '3':
break

elif choice not in '1' or '2' or '3':
print("Invalid input-try again!")
```