Factorial Example Program Using Function In C Programming Language

Definition of Factorial

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n.

For example,

6! = 6 x 5 x 4 x 3 x 2 x 1 = 720

The value of 0! is 1, according to the convention for an empty product.

Example Program For Factorial In C Programming Language

/* Example Program For Find Factorial Number In C Programming Language
  little drops @ thiyagaraaj.com
  Coded By:THIYAGARAAJ MP       */

// Header Files
#include<stdio.h>
#include<conio.h>

// define Function and Its Argument Type
long factorial(long);

//Main Function
int main()
{
	// Variable Declaration for Factorial Function Input
	long f;

	printf("Enter the Number for Factorial Calculation :?);
	scanf("%ld",&f);
	//factorial calculation
	printf("The Factorial of %ld is %ld",f,factorial(f));

	// Wait For Output Screen
	getch();
	//Main Function return Statement
	return 0;
}

// factorial Function
long factorial(long n)
{
	int counter;
	long fact = 1;

	//for Loop for Factorial Calculation Block
	for (counter = 1; counter <= n; counter++)
	{
		fact = fact * counter;
	}
	return fact;
}

Sample Output

Enter the Number :6

6 Factorial Value Is 720