please explain the concept of nested functions and recursive functions, (with example)

@vimalgeorge1999

A recursive function is a function in code that refers to itself for execution. Recursive functions can be simple or elaborate. They allow for more efficient code writing.

Simple examples of a recursive function include the factorial, where an integer is multiplied by itself while being incrementally lowered. Many other self-referencing functions in a loop could be called recursive functions, for example, where n = n - 1 given an operating range.

@vimalgeorge1999

A nested function is a function that is completely contained within a parent function. Any function in a program file can include a nested function.

The primary difference between nested functions and other types of functions is that they can access and modify variables that are defined in their parent functions.