Hellos.java

Below is the syntax highlighted version of Hellos.java from §1.3 Conditionals and Loops.

/******************************************************************************
 *  Compilation:  javac Hellos.java
 *  Execution:    java Hellos n
 *
 *  Prints ith Hello for i = 1 to n.
 *
 *  % java Hellos
 *  1st Hello
 *  2nd Hello
 *  3rd Hello
 *  4th Hello
 *  5th Hello
 *  6th Hello
 *  7th Hello
 *  8th Hello
 *  9th Hello
 *  10th Hello
 *  11th Hello
 *  12th Hello
 *  13th Hello
 *  14th Hello
 *  15th Hello
 *  16th Hello
 *  17th Hello
 *  18th Hello
 *  19th Hello
 *  20th Hello
 *  21st Hello
 *  22nd Hello
 *  23rd Hello
 *  24th Hello
 *
 ******************************************************************************/

public class Hellos {
    public static void main(String[] args) {
        int n = Integer.parseInt(args[0]);

        for (int i = 1; i <= n; i++) {
            System.out.print(i);

            // ends in 11 through 20 -> use "th" as suffix
            if (i % 100 >= 11 && i % 100 <= 20) {
                System.out.print("th");
            }

            // otherwise if ends in { 1, 2, 3 } -> use { "st", "nd", "rd" }  as suffix
            else if (i % 10 == 1) System.out.print("st");
            else if (i % 10 == 2) System.out.print("nd");
            else if (i % 10 == 3) System.out.print("rd");

            // otherwise use "th" as suffix
            else                  System.out.print("th");

            System.out.println(" Hello");
        }

    }
}