Using C language Question 3:a) Write a C function count_digits() which takes an integer n as parameter and returns the numberof digits in that integer. For example if n=12345 then your function should return 5. Writeappropriate main function to check your code.b) Write the above function count_digits() by using recursion.

Recursion Recursion is the process of repeating items in a self-similar way. In programming…

Answered: Question 3: a) Write a C function…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Recursion

Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a recursive call of the function.

The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.

Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.
A function in C can be called either with arguments or without arguments.
These function may or may not return values to the calling functions.
All C functions can be called either with arguments or without arguments in a C program.

Step 2

Function with no argument and no return value :

When a function has no arguments, it does not receive any data from the calling function.

Similarly when it does not return a value, the calling function does not receive any data from the called function.

Function declaration : void function();
Function call : function();
Function definition :
                      void function()
                      {
                        statements;
                      }
Function with arguments but no return value : When a function has arguments, it receive any data from the calling function but it returns no values.

Syntax :

Function declaration : void function ( int );
Function call : function( x );
Function definition:
             void function( int x )
             {
               statements;
             }
Function with no arguments but returns a value : There could be occasions where we may need to design functions that may not take any arguments but returns a value to the calling function. A example for this is getchar function it has no parameters but it returns an integer an integer type data that represents a character.

Function declaration : int function();
Function call : function();
Function definition :
                 int function()
                 {
                     statements;
                      return x;
                  }

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