// Examples using for loops
public class ForLoops {
   public static void main(String[] args) {
      printSquares();
      System.out.println();
      blastoff();
      System.out.println();
      square();
      System.out.println();
      pyramid();
      System.out.println();
      numberPyramid();
      System.out.println();
      lineNumberPyramid();
      System.out.println();
   }
   
   /*
   display the following output:
     1 squared = 1
     2 squared = 4
     3 squared = 9
     4 squared = 16
     5 squared = 25
     6 squared = 36
     Done!
   */
   public static void printSquares() {   
      for (int i = 1; i <= 6; i++) { 
         System.out.println(i + " squared = " + (i * i));
      }
      System.out.println("Done!");
   }
   
   // display the following text:
   // 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 >= 1; i--) {
         System.out.print(i + ", ");
      }
      System.out.println("blastoff!");
   }
   
   /* display the following square of stars:
     **********
     **********
     **********
     **********
     **********
   */
   public static void square() {
      for (int line = 1; line <= 5; line++) {
         for (int star = 1; star <= 10; star++) {
            System.out.print("*");
         }
         System.out.println();
      }
   }
   
   /* display a pyramid of stars
     *
     **
     ***
     ****
     *****
   */
   public static void pyramid()   {
      for (int line = 1; line <= 5; line++) {
         for (int star = 1; star <= line; star++) {
            System.out.print("*");
         }
         System.out.println();
      }
   } 

   /* display a pyramid of numbers
     1
     12
     123
     1234
     12345
   */
   public static void numberPyramid() {
      for (int i = 1; i <= 5; i++) {
         for (int j = 1; j <= i; j++) {
            System.out.print(j);
         }
         System.out.println();
      }
   }
   
   /* display a pyramid of line numbers
     1
     22
     333
     4444
     55555
   */
   public static void lineNumberPyramid() {
      for (int i = 1; i <= 5; i++) {
         for (int j = 1; j <= i; j++) {
            System.out.print(i);
         }
         System.out.println();
      }
   }  
}