Factorial in C

Hey! Today i am gonna show you how to calculate factorial of a number. The code below depicts the basic methodology of how to calculate factorial of a number.

# include<stdio.h>

void factorial(int number){
	int i;
	long long int factorial=1;
	for ( i = number ; i > 0 ; i-- ) 
		factorial*=i;
	//	Printing the factorial of the number	**/
	printf("Factorial of %d = %lld",number,factorial);
	return 0;
}

int main(){
    	//		Declaring variables				**/
    	int num;
    	//		Asking and scanning input			**/
    	printf("Enter a number : ");
    	scanf("%d",&num);
    	//		Passing number to the function			**/
    	factorial(num);
    	return 0;
}

output of above code will be

Enter a number : 5
Factorial of 5 = 120

So, as you have seen the code simply takes up a integer and passes it to the factorial() function which in turns prints up the factorial of that number.

factorial() is simply based on the technique of how we calculate factorial on pen and paper as :

5! = 5 * 4* 3* 2* 1 = 120

Well, this was just a simple program on factorial, I will come up soon with some awesome programs! Keep coding till then!