Compute distance light travels using long variables : Long « Data Type « Java Tutorial

1. Java Tutorial
2. Data Type
3. Long

public class MainClass {
  public static void main(String args[]) {
    int lightspeed;
    long days;
    long seconds;
    long distance;

    // approximate speed of light in miles per second
    lightspeed = 186000;

    days = 1000; // specify number of days here

    seconds = days * 24 * 60 * 60; // convert to seconds

    distance = lightspeed * seconds; // compute distance

    System.out.print("In " + days);
    System.out.print(" days light will travel about ");
    System.out.println(distance + " miles.");
  }
}

In 1000 days light will travel about 16070400000000 miles