Quiz 5

Wednesday

With a piece of paper, write down your name and answers to the following questions.

1. What is the value of data[3][4] in the following 2D array?

   int[][] data = new int[6][];
   data[0] = new int[] {1, 2, 3, 4, 5};
   data[1] = new int[] {6, 7, 8};
   data[2] = new int[] {9, 10, 11, 12};
   data[3] = new int[] {13, 14, 15, 16, 17, 18};
   data[4] = new int[] {19, 20, 21, 22};
   data[5] = new int[] {23, 24, 25, 26};

   1. 12
   2. 17
   3. 15
   4. Accessing data[3][4] generates an error.

2. Which of the following is not true about static members?

   1. It is not necessary for an instance of a class to be created to execute static methods or use static fields
   2. Static members are created by placing the keyword static in the definition.
   3. A static method cannot access instance members of the class using the keyword this
   4. Multiple separated instances of a static field may exist

3. What attribute does the compareTo method of an enum use to compare two enum constants? E.g.,

   public class Program {
   	public static void main(final String[] args) {
   		int result = Gender.Female.compareTo(Gender.Male);
   		:
   	}
   }
   enum Gender {
     Confidential,
     Male,
     Female;
   }

   Answer: Ordinal.

4. Determine if the following statement is correct and why?

   A problem can be solved recursively if it can be broken down into successive smaller problems that are different from the overall problem.

   Answer: False, the successive smaller problems need to be the same as the overall problem

Student Performance and Statistics

A histogram of student performance on percentage grades for Quiz 5 on Wednesday.

A table showing the average performance for each question in Quiz 5 on Wednesday.