**What do you mean by recursive functions?**

*A function may call itself or other functions, and the called functions in turn may again call the calling function. Such functions are called recursive functions.*

*Any correct iterative code can be converted into its equivalent recursive code and vice versa.*

*The basic concepts and ideas involved with recursion are simple - a function that has to be solved is treated as a Big problem and it solves itself by using itself to solve a slightly smaller problem. The recurrence relation is easily converted to recursive code.*

*Recursion can be used in*

**Divide and conquer**based search algorithms to increase the efficiency of these operations.

**Binary Recursion:**A simple unary recursive function calls itself once, whereas the binary recursive function call itself twice. A factorial is a unary function, whereas Fibonacci is a binary recursion.

**Depth of recursion:**The number of times a function calls itself is known as the recursive depth of that function.

**Direct and Indirect recursion:**When a recursive function calls itself directly, it is called direct recursion and when the function calls another function, which in turn calls the first function, it is called an indirect recursion.

**End condition:**Recursive functions usually have and in fact should have a condition that would terminate the recursive calls. The terminating condition is called end condition. In the function factorial, when n=1 the function returns 1. If this condition were not present, the function would keep calling itself with the values ......., 3, 2, 1, 0, -1, -2, -3, ..... and so on until infinity. Such a recursive function is known as endless recursion.

**Thanks**

**Mukesh Rajput**

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Thanks

Mukesh Rajput