How to print output: StdOut.printf("%d\n", N); StdOut.printf("%.2e\n", R); for (int i = 0; i < N; i++) { StdOut.printf("%11.4e %11.4e %11.4e %11.4e %11.4e %12s\n", px[i], py[i], vx[i], vy[i], mass[i], image[i]); }