13.7.

public class Pingali {

  public static void main(String[] args) {

    int number = (int)Math.round(Math.random() * 10);

    switch (number % 2) {

      case 0:

        System.out.println(number + ", is even");

        break;

      case 1:

        System.out.println(number + ", is odd");

    }

  }

}



---------------------------------



public class Shanmugasundaram {

  public static boolean andOp (boolean x, boolean y) {

    if (x)

      return y;

    else

      return false;

  }

}



---------------------------------



switch (test) {

  case 'a':

    System.out.println("You did great!");

    break;

  case 'b':

    System.out.println("You did well!");

    break;

  case 'c':

    System.out.println("You passed!");

    break;

  case 'd':

    System.out.println("Well, you didn't fail!");

    break;

  default:

    System.out.println("Mission Control, we've got problems");

}





13.10.

public class deconticativen {

  public static void main(String[] args) {

    for (char char1 = 'a', char2 = 'n'; char1 <= 'm'; char1++, =
char2++) {

      System.out.println(char1 + " " + char2);

    }

  }

}



public class mounfossing {

  public static void main(String[] args) {

    char char1 = 'a', char2 = 'n';

    while (char1 <= 'm') {

      System.out.println(char1 + " " + char2);

      char1++;

      char2++;

    }

  }

}





13.12

The value of 'i' can be printed since it was declared within the same =
block as the print statement, but the value of 'j' cannot be accessed =
because its scope is limited to the 'for' block.