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Unit 8 - AP Computer Science - AP Classroom Exam Questions and Answers
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Unit 8 - AP Computer Science - AP Classroom Exam
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Unit 8 - AP Computer Science - AP Classroom ExamA two-dimensional array myArray is to be created with the following contents.
{{0, 0, 3},
{0, 0, 0},
{7, 0, 0}}
Which of the following code segments can be used to correctly create and initialize myArray ? int myArray[][] = new int[3 [3]; myArray[0][2] = 3;
myArray[2][0] = 7;
int myArray[][] = new int[3][3];myArray[0][2] = 7;myArray[2][0] = 3;
int myArray[][] = {{0, 0, 3}, {0, 0, 0}, {7, 0, 0}}; - Answer -D. I and III
Consider the following code segment, which is intended to create and initialize the two-
dimensional (2D) integer array num so that columns with an even index will contain only
even integers and columns with an odd index will contain only odd integers.
int[][] num = /* missing code */;
Which of the following initializer lists could replace /* missing code */ so that the code segment will work as intended? - Answer -{{0, 1, 2}, {4, 5, 6}, {8, 3, 6}}
Consider the following code segment, which is intended to display "cat".
String[][] keyboard = {{"q", "w", "e", "r", "t"},
{"a", "s", "d", "f", "g"},
{"z", "x", "c", "v", "b"}};
System.out.println(/* missing expression */);
Which of the following can replace /* missing expression */ so that the code segment works as intended? - Answer -keyboard[2][2] + keyboard[1][0] + keyboard[0][4]
Consider the following code segment, where twoD is a two-dimensional (2D) String array. The code segment is intended to display "JAVA".
System.out.print(twoD[2][1]);
System.out.print(twoD[3][2]);
System.out.print(twoD[1][1]); Which of the following code segments properly declares and initializes twoD so that the code segment works as intended? - Answer -String[][] twoD = {{"V", "AV", "J"}, {"JA", "VA", "A"},
{"JA", "J", "JAV"}, {"AV", "V", "A"}};
int[][] multi = new int[4][4];
for (int rows = 0; rows < 4; rows++)
{
for (int cols = 0; cols < 4; cols++)
{
if (cols == 0)
{
multi[rows][cols] = 0;
}
else if (cols == 1)
{
multi[rows][cols] = 1;
}
else if (cols == 2)
{
multi[rows][cols] = 2;
}
if ((rows % 2 == 0) && (cols % 2 == 0))
{
if ((rows >= 2) && (cols <= 2))
{
multi[rows][cols] = 9;
}
}
}
}
As a result of executing the code segment, how many elements in the two-dimensional (2D) array multi will store the value 9 ? - Answer -C. 2
Consider the following code segment.
int[][] mat = {{10, 15, 20, 25},
{30, 35, 40, 45},
{50, 55, 60, 65}};
for (int[] row : mat)
{
for (int j = 0; j < row.length; j += 2)
{
System.out.print(row[j] + " ");
}
System.out.println();
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