drugi_kolokvijum_a_pi

#include <stdio.h>

#define TACNOST 0.001

int main(int argc, char** argv) {
    double pi=0;
    int n=1;
    int jedan=1;
    while (1) {
        pi += jedan*(double)1/n;
        if ((double)1/n < TACNOST) break;
        n+=2;
        jedan = -jedan;
    }
    printf("pi = %.33lf", pi*4);
    return 0;
}