Write a recursive C++ function, sumdigits, which will accept a positive integer and calculate and return the sum of the digits in the number. For example, if 123456 is passed to this function, it would return 1+2+3+4+5+6 = 21. Requirements and Comments: The sumdigits function must not contain any cout or cin statements. • The sumdigits function must be recursive. You do not need to write a complete program.

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Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.