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C - 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. Recursion in C. Recursion is the process which comes into existence when a function calls a copy of itself to work on a smaller problem. Any function which calls itself is called recursive function, and such function calls are called recursive calls. Recursion involves several numbers of recursive calls. However, it is important to impose a termination condition of recursion.

In this tutorial, you will learn to write how to use pampered chef knife sharpener functions in C programming with the help of an example. A function that calls itself is known as a recursive function.

And, this technique is known as recursion. The recursion continues until some condition is met to prevent it. To prevent infinite recursion, if Initially, the sum is called from the main function with number passed as an argument. Suppose, the value of n inside sum is 3 initially.

During the next function call, 2 is passed to the sum function. This process continues until n is equal to 0. When n is equal to 0, the if condition fails and the else part is executed returning the sum of integers ultimately to the main function.

Recursion makes program elegant. However, if performance is vital, use loops instead as recursion is usually much slower.

That being said, recursion is an important concept. It is frequently used in data structure and algorithms. For example, it is common to use recursion in problems such as tree traversal.

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Start Learning C. Explore C Examples. Join our newsletter for the latest updates. This is required. Table of Contents Recursion Introduction How recursion works? C Recursion In this tutorial, you will learn to write recursive functions in C programming with the help of an example. How recursion works? Previous Tutorial:. Next Tutorial:. Share on:. Was this article helpful? Sorry about that. How can we improve it? Leave this field blank.

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C Recursion In this tutorial, you will learn to write recursive functions in C programming with the help of an example. A function that calls itself is known as a recursive function. And, this technique is known as recursion. Recursion in C Programming The process of calling a function by itself is called recursion and the function which calls itself is called recursive function. Recursion is used to solve various mathematical problems by dividing it into smaller problems. This method of solving a problem is called Divide and Conquer. In the C programming language, a recursive function is a special function that calls to itself in a program and this process is known as Recursion. Like other programming languages, C language allows you to define recursive functions easily in the program.

Recursion is the process which comes into existence when a function calls a copy of itself to work on a smaller problem. Any function which calls itself is called recursive function, and such function calls are called recursive calls. Recursion involves several numbers of recursive calls. However, it is important to impose a termination condition of recursion. Recursion code is shorter than iterative code however it is difficult to understand. Recursion cannot be applied to all the problem, but it is more useful for the tasks that can be defined in terms of similar subtasks.

For Example, recursion may be applied to sorting, searching, and traversal problems. Generally, iterative solutions are more efficient than recursion since function call is always overhead. Any problem that can be solved recursively, can also be solved iteratively. However, some problems are best suited to be solved by the recursion, for example, tower of Hanoi, Fibonacci series, factorial finding, etc. A recursive function performs the tasks by dividing it into the subtasks.

There is a termination condition defined in the function which is satisfied by some specific subtask. After this, the recursion stops and the final result is returned from the function. The case at which the function doesn't recur is called the base case whereas the instances where the function keeps calling itself to perform a subtask, is called the recursive case. All the recursive functions can be written using this format.

Each recursive call creates a new copy of that method in the memory. Once some data is returned by the method, the copy is removed from the memory.

Since all the variables and other stuff declared inside function get stored in the stack, therefore a separate stack is maintained at each recursive call. Once the value is returned from the corresponding function, the stack gets destroyed. Recursion involves so much complexity in resolving and tracking the values at each recursive call. Therefore we need to maintain the stack and track the values of the variables defined in the stack. Let us consider the following example to understand the memory allocation of the recursive functions.

First, all the stacks are maintained which prints the corresponding value of n until n becomes 0, Once the termination condition is reached, the stacks get destroyed one by one by returning 0 to its calling stack. Consider the following image for more information regarding the stack trace for the recursive functions. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint.

Duration: 1 week to 2 week. Command Line Arguments. Enter the number whose factorial you want to calculate? Next Topic Storage classes in C. Manual T. Verbal A. Angular 7. Compiler D. Software E. Web Tech. Cyber Sec. Control S. Data Mining. Javatpoint Services JavaTpoint offers too many high quality services. In the following example, recursion is used to calculate the factorial of a number. Pseudocode for writing any recursive function is given below.

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