Factorial Program in C: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n! For example: Here, 4! Is pronounced as '4 factorial', it is also called '4 bang' or '4 shriek'. The factorial is normally used in. Dec 27, 2016 Write a C program to find factorial of number using function. Here’s simple c program to find factorial of a number using while loop in C Programming Language.

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Factorial of a non-negative integer n is the product of all the positive integers that are less than or equal to n.

For example: The factorial of 5 is 120.

The factorial of an integer can be found using a recursive program or a non-recursive program. Example of both of these are given as follows.

A for loop can be used to find the factorial of a number. This is demonstrated using the following program −

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In the above program, the for loop runs from 1 to n. For each iteration of the loop, fact is multiplied with i. The final value of fact is the product of all numbers from 1 to n. This is demonstrated using the following code snippet.

The following program demonstrates a recursive program to find the factorial of a number.

In the above program, the function fact() is a recursive function. The main() function calls fact() using the number whose factorial is required. This is demonstrated by the following code snippet.

If the number is 0 or 1, then fact() returns 1. If the number is any other, then fact() recursively calls itself with the value n-1.

This is demonstrated using the following code snippet −

**Factorial Program in C++:** Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example:

Here, 4! is pronounced as '4 factorial', it is also called '4 bang' or '4 shriek'.

The factorial is normally used in Combinations and Permutations (mathematics).

There are many ways to write the factorial program in C++ language. Let's see the 2 ways to write the factorial program.

- Factorial Program using loop
- Factorial Program using recursion

Let's see the factorial Program in C++ using loop.

Output:

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Let's see the factorial program in C++ using recursion.

Output:

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