#include <stdio.h>
#include <math.h>
#define V 60
#define N 12
#define EPSILON 0.001
int main() {
  double rad;
  int i, n;
  for (rad = 0.0; rad <= 2.0 * M_PI + EPSILON; rad += M_PI / N) {
    n = V / 2 + (int)(sin(rad) * V / 2.0);
    for (i = 0; i < n; i++)
      putchar(' ');
    printf("*\n");
  }
  return 0;
}
/* end */

In function `main':
undefined reference to `sin'