光程1年

package day01;

public class Light {

	public static void main(String[] args) {
		long lightspeed;
		long distance;

		lightspeed = 300000;
		distance = lightspeed * 365L * 24 * 60 * 60;
		System.out.println("빛이 1년동안 가는 거리 : " + distance + " km.");
	}

}

出力結果