Super Simple MC Simulation on OS X 10.7. No error checking or anything like that…

gistfile1.m

#import <Foundation/Foundation.h>
#define ARC4RANDOM_MAX      0x100000000


int main(int argc, const char * argv[])
{
    
    @autoreleasepool {
        
        
        long double hit = 0;
        unsigned long i;
        unsigned long count;
        
        for (i=10;i<1E10;i=i*10) {
            hit = 0;
            for (count = 0; count < i; count++) {
                
                
                long double x = ((double)arc4random() / ARC4RANDOM_MAX);
                long double y = ((double)arc4random() / ARC4RANDOM_MAX);
                
                
                double point = (x*x + y*y);
                if (point < 1) {
                    hit++;
                }
                
            }
            NSLog(@"Threw %ld times. %lu hits and %lu misses", count, (unsigned long)hit, ((unsigned long)count-(unsigned long)hit));
            NSLog(@"Estimating pi at: %Lf",  (4 * hit/count));
        }
        
        
    }
    return 0;
}