public class NestedForLoops {
   public static void main(String[] args) {
      square();
      mult();
      pyramid();
      dotFigure();
   }
   
   /* display the following grid of stars using for loops:
      **********
      **********
      **********
      **********
      **********
   */
   public static void square() {
      for (int i = 1; i <= 5; i++) { // this outer loop repeats the number of lines
         // System.out.println("**********");
         for (int j = 1; j <= 10; j++) { // this inner loop repeats the number of stars on a line
            System.out.print("*");
         }
         System.out.println(); // this blank println ends the line so the next time through the
                               // loop when i is updated, the star appear on the following line
      }  
   }
   
   /* 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);
      }
   } 
}