Write a recursive function that calculates the factorial of a positive integer.

Difficulty level
This exercise is mostly suitable for students 
#include<stdio.h>
#include<conio.h>

int factrec(int n)
{
  	if (n <= 1)
    		return 1;
    	return n * factrec(n-1);
}
 
void main()
{
  	int n;


  	printf("n : ");
  	scanf("%d", &n);

  	printf("%d!=%d\n",n,factrec(n));

	getch();
}
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Program output 9