C Program to find Factorial of a Number

Factorial program in C : This program calculates or find the factorial of a number using function, for loop and recursion.

C Program to Find Factorial of Number

Here is the source code of C program find the factorial of Number.
/* Aim: Write a C program to find or calculate factorial of a number. */

#include<stdio.h>

int main()
{
	int i,fact=1,num;

	printf("\n Enter the any number:- ");
	scanf("%d",&num);

	for(i=num;i>=1;i--)
	{
	fact*=i; 
	}
 
	printf("\n The factorial of %d is %d \n \n",num,fact);

	return 0;
}

Output:

 Enter the any number:- 5

 The factorial of 5 is 120

Flowchart to Find Factorial of a Number

Algorithm (wap) to find factorial of a number in C

  1. Start
  2. Accept any number to find its factorial.
  3. Declare and initialize an integer variable to save the factorial of given number.
  4. Use for loop to loop through 1 to given number. Here we can loop forward as well as backward.
  5. Finally print the factorial of given number.
  6. Stop.

C Program to Find Factorial of Number using Function

/* Aim: Write a function for the following function prototype
void Factorial(int a) */

#include<stdio.h>

void Factorial(int a); // Factorial Function Prototype

int main()
{
	int a;
	printf("\n Enter any value:- ");
	scanf("%d",&a);

	Factorial(a);

	return 0;
}

// Factorial Function

void Factorial(int a)
{
	int i,fact=1;
 
	for(i=a;i>=1;i--)
	{
	fact*=i;
	} 

	printf("\n Factorial of %d is %d \n \n",a,fact);
}/

Output:

 Enter any value:- 6

 Factorial of 6 is 720

Factorial Program Using Recursion in C

/* Aim: Write a recursive program to factorial of given number */

#include<stdio.h>

long int Factorial(int num); // Factorial Function Prototype

int main()
{
	int num;
	printf("\n Enter any number:- ");
	scanf("%d",&num);

	printf("\n Factorial of %d is %d \n \n",num,Factorial(num));

	return 0;
}


// Factorial Function

long int Factorial(int num)
{
	if(num==0 || num==1)
	return 1;
	else 
	return (num*Factorial(num-1));
}
 Enter the any number:- 9

 The factorial of 9 is 362880
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