Find Factorial of a number recursively in Objective-C

#import <Foundation/Foundation.h>

float factorial(int n)
{
if(n<=1)
return(1);
return n*factorial(n-1);
}

int main (int argc, const char * argv[])
{
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   long fact=factorial(8);
   NSLog (@"Factorial of 8 is %ld",fact);
 [pool drain];
   return 0;
}