In this program, main() program is invoked recursively. A prototype of function main()
is given before the function definition. In recursion, the function invoked should have return
type and arguments. Working of recursion is briefed as follows.
1. When a recursive function is executed, the recursion calls are not implemented instantly.
All the recursive calls are pushed on to the stack until the terminating condition is not
detected. As soon as the terminating condition is detected, the recursive calls stored in
the stack are popped and executed. The last call is executed first, then the second, third
and ...
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