Skip to main content

Subgoals

Section 10.10 Assessment: Arrays 1

Subgoals for Evaluating Arrays.

  1. Set up array from 0 to size-1
  2. Evaluate data type of statements against array
  3. Trace statements, updating slots as you go
    1. Remember assignment subgoals

Exercises Exercises

    1.

      Q1: Assuming that the following declaration has been made, which of the following code segments correctly interchanges the value of arr[0] and arr[5]?
      int [] arr = new int[10];
      Figure 10.10.1.
    • See diagram for answer A
    • See diagram for answer B
    • See diagram for answer C
    • See diagram for answer D
    • See diagram for answer E

    2.

      Q2: Consider the following code that is intended to print true if all the elements in array arr are even numbers; otherwise it should print false. You may assume that arr has been declared and contains valid integer values.
      boolean isEven = /* expression */ ;
for (int k = 0; k < arr.length; k++) {
   /* loop body */
}
if (isEven)
   System.out.println("TRUE");
else
   System.out.println("FALSE");
      Which of the following replacements for /* expression */ and /* loop body */ should be used so that the code works as intended?
      Figure 10.10.2.
    • See diagram for answer A
    • See diagram for answer B
    • See diagram for answer C
    • See diagram for answer D
    • See diagram for answer E

    3.

      Q3: Considering the following code, what are the values in numbers after execution?
      int [] numbers = {17, 34, 21, 42, 15, 69, 48, 25, 39};
int x = 3;
for (int k = 1; k < numbers.length; k = k + x)
   numbers[k] = numbers[k-1] + x;
    • {17, 20, 21, 42, 45, 69, 48, 51, 39}
    • {17, 20, 23, 26, 29, 32, 35, 38, 41}
    • {17, 37, 21, 42, 18, 69, 48, 28, 39}
    • {20, 23, 21, 42, 45, 69, 51, 54, 39}
    • {20, 34, 21, 45, 15, 69, 51, 25, 39}
You have attempted of activities on this page.
PrevTopNext