# Binary to denary and vice versa

<Below this line, add a link to the EXACT exercise that you are stuck at.>

<In what way does your code behave incorrectly? Include ALL error messages.>
my code doesn’t actually print anything out. i tried to call on the functions but they didn’t work.
<What do you expect to happen instead?>

```python

def denaryToBinary(denaryNo):#the name of the function
if denaryNo <= 255:#to make sure you can turn it into an bite
x = #the empty binary list
y = 128#for the first 1 or 0 in binary

``````    while y >= 1:#the while...else loop to turn my number into binary
if denaryNo - y > 0:#to make the number 1
denaryNo -= y#to take away the 2^y number
x.append(1)#to put a 1 there
y = y / 2#to get to the next number

elif denaryNo - y == 0:
x.append(1)#in case the binary number is equal to the 2^y number

else:
x.append(0)#to put a 0 there

else:
return x#when the loop finishes
``````

def binaryToDenary(binaryNo):
binaryNo = [int(x) for x in str(binaryNo)]
x = len(binaryNo)
y = 0
if x >= 8:
return “this isn’t a bite”
elif x <= 7:
while x > 0:
if binaryNo[x-1] == 1:
y += 2**(x+2)
x -= 1
elif binaryNo[x-1] == 0:
x -= 1
else:
return “wait…this isn’t a binary number!”
else:
return y

carryOn = True

while carryOn == True:
binaryOrDenary = input(“is the number you are going to input a binary or a denary number? B or D”)

``````if binaryOrDenary.lower() == "b":
print(binaryToDenary(theInput))

elif binaryOrDenary.lower() == "d":
print(denaryToBinary(theInput))

else:
print("that wasn't an option")

carryOn = input("do you want to carry on? y/n")

if carryOn.lower() == "y":
carryOn = True

elif carryOn.lower() == "n":
carryOn = False
``````

else:
print(“goodbye”)

``<do not remove the three backticks above>``

Your code prompts for input, so it does print something. Perhaps you mean something else? Or if you meant that it prints nothing, then the problem is in how you are invoking your program

If the problem isn’t with printing, but with terminating, then I suggest adding prints in your code that say what it’s currently doing, thus allowing you to see what it does differently from what you wanted

1 Like

i tried that when i was making it. when i was making it i called on the function and it worked perfectly but when i finished creating the selection section it didn’t work.

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