Hi Ashish,
I understand yours is in working condition but not so close to recursion implementation, as in your program, the calculation being done by accumulate using global variable.
That's why i modified from your program to match to the recursion implementation as in the recursion example in C I provided earlier.
In conclusion we can implement the recursion logic in ABAP.
Again it is just a concept of logic how to get thing done. Unlikely it is has any dependent to any particular programming language to implement them.
Hope this make sense to you too.
Thanks.
regards,
Xiang Li