int main(int argc, const char* argv[]) { int n=1; while (1) { scanf("%d",&n); if (n>=1) { printf("%15.13f\n", piC(n)); fflush(stdout); fflush(sterr); } else break; } }
int main(int argc, const char* argv[]) { int n; scanf("%d",&n); printf("%15.13f\n", piC(n)); }