C Program to Find Factorial. The factorial of a positive integer n is equal to 1.2.3.n. You will learn to calculate the factorial of a number using for loop in this example. To understand this example, you should have the knowledge of following C programming topics: C for Loop. Write C Program to find factorial of Number. Today we will learn How to Find factorial of Number Using C Program. But First of All lets discuss what is a Factorial. It is denoted by n!

Write a C++ Program to find Factorial of a number using class. Here’s simple C++ Program to find Factorial of a number using class in C++ Programming Language.

What are Functions ?

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function declaration tells the compiler about a function’s name, return type, and parameters. A function definition provides the actual body of the function.

Defining a Function : :

Factorial Program In C

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )
{
//function’s body
}

• return_type : suggests what the function will return. It can be void, int, char, some pointer or even a class object.
• Function_Name : is the name of the function, using the function name it is called.
• Parameters : are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.
• Function body : is he part where the code statements are written.

Below is the source code for C++ Program to find Factorial of a number using class which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

Above is the source code for C++ Program to find Factorial of a number using class which is successfully compiled and run on Windows System.The Output of the program is shown above .

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Factorial In C

By definition, a Factorial of a non-negative integer is the product of all the positive integers less than or equal to n as represented in the following math notation:

Factorials have a prominent place in mathematics as they are encountered in combinatorics, taylor expansions and in the number theory. For instance factorial of n is the number of ways one can arrange n different objects. If you are studying computer science, one of the most common tasks to solve in programming is how to obtain the factorial of a number.

In this article, we'll explain how you can obtain the factorial of a positive integer number in C with a very simple logic.

A. With iterations

The easiest way to do and understand the logic to obtain a factorial from a n number is with a for loop. You will need to define a for loop that will iterate from 1 up to the given n number. On every iteration the fact variable that initially has the 1 value will be updated with the result of the multiplication of itself with the index of the current iteration. In the following example we'll prompt for the number to calculate and we'll print the result at the end:

C++ Factorial While Loop

You can convert it into a function if you want:

B. The recursive way

In programming, the recursion is a technique in which a function calls itself, for example, in the following code example, the factorial function will call itself:

How To Code A Factorial In Dev C Example

Note that the definition of the function is necessary in the recursion. What would be the preferred way to proceed for you?

Happy coding !