Calculate pi to 29 digits

    #include <stdio.h>
    #include <math.h>
    #define ld __float128

    ld pie(int level);
    ld cake(int level);
    void sho(ld a);

    //
    // I borrowed sho() from:
    // http://mathforum.org/kb/thread.jspa?threadID=2229919&messageID=7363928
    //
    int main()
    {
        ld pi = 16 / cake(0) - 4 / pie(0);
        sho(pi);
        return 0;
    }

    ld pie(int level)
    {
        if(level > 15) return 1;
        ld x = (478*level)+239 + (level+1)*(level+1) / pie(++level);
        return x;
    }

    ld cake(int level)
    {
        if(level > 15) return 1;
        ld x = (10*level)+5 + (level+1)*(level+1) / cake(++level);
        return x;
    }

    void sho (ld a) {
            long double c = floor ((long double)(1e10Q * a));
            ld d = c, f = a - d/1e10Q, g=1e30Q * f;
            printf("%0.10Lf%020.0Lf\n", c/1e10L, (long double)g);
    }