#include "stdio.h"

include "stdlib.h"
define SCALE 10000
define ARRINIT 2000
void pi_digits(int digits) { 
    int carry = 0; 
    int arr[digits + 1]; 
    for (int i = 0; i <= digits; ++i) 
        arr[i] = ARRINIT; 
    for (int i = digits; i > 0; i-= 14) { 
        int sum = 0; 
        for (int j = i; j > 0; --j) { 
            sum = sum  j + SCALE  arr[j]; 
            arr[j] = sum % (j  2 - 1); 
            sum /= j  2 - 1; 
        } 
        printf("%04d", carry + sum / SCALE); 
        carry = sum % SCALE; 
    } 
}
int main(int argc, char** argv) { 
    int n = argc == 2 ? atoi(argv[1]) : 100; 
    pi_digits(n);

return 0; 

}  </pre>