Think Java code snippets.

Time.java

public class Time {
  
  public static void main(String[] args) {
   
   int hour, minute, second;
   
   // Comments when started program, syntax when finished.
   // hour = 23;
   hour = 23;
   // minute = 49;
   minute = 59;
   // second = 30;
   second = 58; 
   double percentage = (hour * 100) / 24;
   
   System.out.println("Seconds since midnight.");
   System.out.println((60 * 60) * hour + (minute * 60) + second);
   System.out.println("Seconds until midnight.");
   System.out.println((60 * 60) * (24 - hour) + (minute * 60) + second);
   System.out.println("Percentage of day passed.");
   System.out.println(percentage);
  }
}