Can anyone make heads or tales of this spigot algorithm code Pitiny.c

Question

This C program is just 143 characters long!

But it “decompresses” into the first 10,000 digits of Pi.

//  Created by cheeseMan on 3         


        

Answer 1

It can be written as

long a[35014];
long b;
long c=35014;
long d;
long e;
long f=1e4;
long g;
long h;

int main(int argc, const char * argv[])
{
    for(; (b=c-=14); h=printf("%04ld",e+d/f)) {
        for(e=d%=f; (g=--b*2); d/=g) {
            d = (d * b) + f * ( h ? a[b] : f/5);
            a[b] = d % --g;
        }
    }
}

In other words it's double for loop