**Factorial**, in mathematics, the product of all positive integers less than or equal to a given positive integer and denoted by that integer and an exclamation point. Thus, factorial seven is written 7!, meaning 1 × 2 × 3 × 4 × 5 × 6 × 7. Factorial zero is defined as equal to 1.

The factorial of a positive number n is given by:

`factorial of n (n!) = 1 * 2 * 3 * 4 *... * n`

The factorial of a negative number doesn't exist. And the factorial of 0 is 1.

### Program:

```
#include<stdio.h>long int multiplyNumbers(int n);
int main() {
int n;
printf("Enter a positive integer: ");
scanf("%d",&n);
printf("Factorial of %d = %ld", n, multiplyNumbers(n));
return 0;
}
long int multiplyNumbers(int n) {
if (n>=1)
return n*multiplyNumbers(n-1);
elsereturn 1;
}
```

**Output**:

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