 In my last post i have explained Fibonacci series in c programming using for loop and recursion. Now i am going to explain about Factorial program in c using for loop and recursion both way, so you will have idea about how same program can be written using different logic.

## What is Factorial of a number?  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,

`5! = 5x4x3x2x1 = 120`

## Factorial program in C programming using For Loop

```#include <stdio.h>

int main()
{
int c, n, fact = 1;

printf("Enter a number to calculate it's factorial\n");
scanf("%d", &n);

for (c = 1; c <= n; c++)
fact = fact * c;

printf("Factorial of number %d = %d\n", n, fact);

return 0;
}```

## Factorial program in C programming using Recursion

```#include<stdio.h>

long factorial(int);

int main()
{
int n;
long f;

printf("Enter an integer to find factorial\n");
scanf("%d", &n);

if (n < 0)
printf("Negative integers are not allowed.\n");
else
{
f = factorial(n);
printf("%d! = %ld\n", n, f);
}

return 0;
}

long factorial(int n)
{
if (n == 0)
return 1;
else
return(n * factorial(n-1));
}```

Please let me know you idea and suggestion in the comment below

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