/*
 *  ======================================================================
 *  DemoBranching.java: Demo features of branching constructs....
 *
 *  Written By: Mark Austin                                    August 2006
 *  ======================================================================
 */

public class DemoBranching {

   // Constructor method.

   public DemoBranching() {};

   // main method : this is where the program execution begins.

   public static void main ( String [] args ) {
      int i = 2, j = 3, k = 3;

      System.out.printf("Starting variables: i = %2d\n", i );
      System.out.printf("                    j = %2d\n", j );
      System.out.printf("                    k = %2d\n", k );

      // Part 1: Demonstrate basic if() statement

         if ( i%2 == 0 )
             System.out.println("Part 1: Variable i is EVEN\n");

         if ( i%2 == 1 )
             System.out.println("Part 1: Variable i is ODD\n");

      // Part 2: Demonstrate basic if() then else statement.
      //         The two examples in Part 1 can be combined into a
      //         single if-else statement.

         if ( j%2 == 0 )
             System.out.println("Part 2: Variable j is EVEN\n");
         else
             System.out.println("Part 2: Variable j is ODD\n");

       // Part 3: Here is another if-else branching construct

          System.out.println("Part 3: i = " + i);
          if (i == 0) {
              System.out.println("Part 3: In block 1!");
          } else {
              System.out.println("Part 3: In block 2!");
          }

       // Part 4: Demonstrate use of else-if() clause ....

          int testscore = 78;
          String grade;

          if (testscore >= 90) {
              grade = "A+";
          } else if (testscore >= 85) {
              grade = "A ";
          } else if (testscore >= 80) {
              grade = "A-";
          } else if (testscore >= 75) {
              grade = "B+";
          } else if (testscore >= 70) {
              grade = "B ";
          } else if (testscore >= 65) {
              grade = "B-";
          } else if (testscore >= 60) {
              grade = "C+";
          } else if (testscore >= 55) {
              grade = "C ";
          } else if (testscore >= 50) {
              grade = "C-";
          } else 
             grade = "D";

          System.out.println("Part 4: Grade = " + grade);

       // Part 5: Branching construct with more complicated conditional
       //         expression....

          i = 0; j = 1; k = 3;
          System.out.println("Part 5.1: i = " + i + " j = " + j + " k = " + k);
          if (i == 0 && j <= 1 && (k == 3 || k == 4) ) {
              System.out.println("Part 5.1: In block 1!");
          } else {
             System.out.println("Part 5.1: In block 2!");
          }

          System.out.println("Note: (i == 0) evaluates to " + (i==0) );
          System.out.println("      (j <= 4) evaluates to " + (j<=4) );
          System.out.println("      (k == 3 || k == 4) evaluates to " +
                                    (k == 3 || k == 4));

          // Now let's change the values of i and k ...

          i = 3; k = 5;
          System.out.println("");
          System.out.println("Part 5.2: i = " + i + " j = " + j + " k = " + k);
          if (i == 0 && j <= 1 && (k == 3 || k == 4) ) {
              System.out.println("Part 5.2: In block 1!");
          } else {
              System.out.println("Part 5.2: In block 2!");
          }

          System.out.println("Note: (i == 0) evaluates to " + (i==0) );
          System.out.println("      (j <= 4) evaluates to " + (j<=4) );
          System.out.println("      (k == 3 || k == 4) evaluates to " +
                                    (k == 3 || k == 4));
   }
}