public class ForLoops {
   public static void main(String[] args) {
      squares();
      blastoff();
      square();
      mult();
      pyramid();
      dotFigure();
   }
   
   /*
      1 squared = 1
      2 squared = 4
      3 squared = 9
      4 squared = 16
      5 squared = 25
      6 squared = 36
   */
   public static void squares() {
      for (int i = 1; i <= 6; i++) {
         System.out.println(i + " squared = " + i * i);
      }
      System.out.println();
   }
   
   // display the following text using a loop:
   // T-minus 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, blastoff!
   public static void blastoff() {
      System.out.print("T-minus ");
      for (int i = 10; i > 0; i--) {
         System.out.print(i + ", ");
      }
      System.out.println("blastoff!");
      System.out.println();
   }
   
   /* display the following grid of stars using for loops:
      **********
      **********
      **********
      **********
      **********
   */
   public static void square() {
      for (int i = 1; i <= 2; i++) {
         // System.out.println("**********");
         for (int j = 1; j <= 2; j++) {
            System.out.print("*");
         }
         System.out.println();
      }
      
   }
   
   /* display a multiplication table
       1	 2	 3	 4 ...
       2	 4	 6	 8 ...
       3	 6	 9  12...
       ..............
       ..............
   */
   public static void mult() {
      for (int row = 1; row <= 10; row++) {
         for (int col = 1; col <= 10; col++) {
            System.out.print(row * col + "\t");
         }
         System.out.println();
      }

   }
   
   /* display a pyramid of stars
      *
      **
      ***
      ****
      *****
   */
   public static void pyramid() {
      for (int line = 1; line <= 5; line++) {
         for (int stars = 1; stars <= line; stars++) {
            System.out.print("*");
         }
         System.out.println();
      }
   
   }
   
   /*
      ....1
      ...2
      ..3
      .4
      5
   */
   
   /*
   line     dots     -1 * line   -1 * line + 5
   1        4        -1          4
   2        3        -2          3
   3        2        -3          2
   4        1        -4          1
   5        0        -5          0
   */
   public static void dotFigure() {
      for (int line = 1; line <= 5; line++) {
         for (int dots = 1; dots <= -1 * line + 5; dots++) {
            System.out.print(".");
         }
         System.out.println(line);
      }
   }   
}