Factorial of a number using function in Python

Question

1.00/5 (1 vote)

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Another is that problem on factorial of a no. using function

def f(n):
if n==0:
r=1
else:
r=n*f(n-1)
return r
print('Ans. is:',r)
f(0)

what is problem here?

Error is showing me that:
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-68-cc9d7ecb020e> in <module>()
6 r=n*f(n-1)
7 return r
----> 8 print('Ans. is:',r)
9 f(0)

NameError: name 'r' is not defined

What I have tried:

Another is that problem on factorial of a no. using function

def f(n):
    if n==0:
        r=1
    else:
        r=n*f(n-1)
    return r
print('Ans. is:',r)
f(0)


what is problem here?

Error is showing me that:
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-68-cc9d7ecb020e> in <module>()
      6         r=n*f(n-1)
      7     return r
----> 8 print('Ans. is:',r)
      9 f(0)

NameError: name 'r' is not defined

Posted 20-Nov-18 1:46am

Member 14053678

Updated 20-Nov-18 3:40am

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3 solutions

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W∴ Balboos, *GHB* · Answer 1 · 2018-11-20T01:52:00

1 - You should look into the concept of scope.
2 - seems like your homework. If you aren't willing to work on an easy problem, now, what do you think you'll do later on when problems are difficult?

Learn how to debug your work.

Also, "1", above, is the answer to your problem - you need to learn why.

Richard MacCutchan · Answer 2 · 2018-11-20T03:14:00

Solution 2

You have a print statement that is trying to reference a variable that does not exist. You must call your function and capture its return value before you can print it.

Posted 20-Nov-18 3:14am

Richard MacCutchan

CPallini · Answer 3 · 2018-11-20T03:40:00

Solution 3

Like the others pointed out, you are trying to access a variable which is out of scope. Try

Python

def f(n):
  if n==0:
    r=1
  else:
    r=n*f(n-1)
  return r

print('Ans. is:',f(5))

Posted 20-Nov-18 3:40am

CPallini