content: /**
   * Examples from Chapter 2.
   */
  public class Variables {
  
      public static void main(String[] args) {
  
          String message;
          int x;
  
          String firstName;
          String lastName;
          int hour, minute;
  
          message = "Hello!";  // give message the value "Hello!"
          hour = 11;           // assign the value 11 to hour
          minute = 59;         // set minute to 59
  
          message = "123";     // legal
          // message = 123;    // not legal
  
          String message2 = "Hello!";
          int hour2 = 11;
          int minute2 = 59;
  
          int a = 5;
          int b = a;     // a and b are now equal
          a = 3;         // a and b are no longer equal
  
          String firstLine = "Hello, again!";
          System.out.println(firstLine);
  
          System.out.print("The value of firstLine is ");
          System.out.println(firstLine);
  
          System.out.print("The current time is ");
          System.out.print(hour);
          System.out.print(":");
          System.out.print(minute);
          System.out.println(".");
  
          System.out.print("Number of minutes since midnight: ");
          System.out.println(hour * 60 + minute);
  
          System.out.print("Fraction of the hour that has passed: ");
          System.out.println(minute / 60);
  
          System.out.print("Percent of the hour that has passed: ");
          System.out.println(minute * 100 / 60);
  
          double pi;
          pi = 3.14159;
  
          double minute3 = 59.0;
          System.out.print("Fraction of the hour that has passed: ");
          System.out.println(minute3 / 60.0);
  
          double y = 1.0 / 3.0;  // correct
  
          System.out.println(0.1 * 10);
          System.out.println(0.1 + 0.1 + 0.1 + 0.1 + 0.1
                           + 0.1 + 0.1 + 0.1 + 0.1 + 0.1);
  
          double balance = 123.45;  // potential rounding error
          int balance2 = 12345;     // total number of cents
  
          System.out.println(1 + 2 + "Hello");
          // the output is 3Hello
  
          System.out.println("Hello" + 1 + 2);
          // the output is Hello12
  
          System.out.println(17 * 3);
          System.out.println(hour * 60 + minute);
  
          int percentage;
          percentage = (minute * 100) / 60;
  
          hour = minute + 1;  // correct
          // minute + 1 = hour;  // compiler error
      }
  
  }
  