
recursive function
how can we convert an iterative function into recursive function ..
i know few recursive functions but every time i am asked to convert an iterative function into a recursive one ...i just get perplexed...
how do we really go for a recursive function ...i mean is there any particular way that i can try cracking an iterative function into its corresponding recursive version..

You don't convert iterative functions to recusive functions. When you think what is a recursive function, think also what kind of written code it could be used to replace. Recursive conversion, is possible on loops (while, for, do  while, if goto, etc).
Code:
void countdown(int start)
{
int n = start;
while(n>0)
{
printf("Countdown to %d\n", n);
n;
}
}
The example function presented can be converted to a recursive.
Code:
void countdown(int n)
{
if(n==0)
return; /* Break recursion */
printf("Countdown to %d\n", n);
countdown(n1);
}
Of course this is a simple example but the same principle applies to most recursive transformations.
It might interest you to know, that the task of converting recursive to nonrecursive functions, is actually of much more use, and interest.