>  I have given my solution below, but still I am not able to get this
>  using functions. Can anyone give more hints? I have given both working
>  and non-working solution below. Check the comments.
> 
> 
> 
>  #!/usr/local/bin/python
>  # Non-Working Solution
>  def euclid(a,b):
>          while b != 0:
>                  c = a
>                  a = b
>                  b = c % a
>                  print 'A = ', a
>                  print 'B = ', b
>          return a
> 
>  x = 100
>  y = 5
> 
>  euclid(x, y)         ###  <---- bug here
> 


Hi Payal,


Same mistake as last time.  *grin* The code is simply dropping the value
that you're calculating from doing euclid().  We need to capture that
value:

###
result = euclid(x, y)
print x
print y
print "GCD is", result
###


Otherwise, your program appears to work ok.




The thing that you need to feel more familiar with is the idea that
functions return things back.


Here's another example of a set of functions:

###
def square(x):
    return x * x

def sqrt(x):
    return x ** (0.5)

def hypotenuse(a, b):
    return sqrt(square(a) + square(b))
###



The last example is important: it shows that once we define a good
function, we can use it as if it were part of the Python language itself.
We could have written hypotenuse() without using square() or sqrt():


###
def hypotenuse(a, b):
    return ((a * a) + (b * b))**(0.5)
###


And, in this example, this even appears slightly shorter than the more
verbose definition.  But I'd argue that the first version is a little
easier on the eyes.  *grin*




Hope this helps!


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