Deck 8: Arrays

Question 1

The one place where C++ allows aggregate operations on arrays is the input and output of C-strings.

Answer 1

True

Question 2

Assume you have the following declaration char nameList[100];. Which of the following ranges is valid for the index of the array nameList?

A) 0 through 99
B) 0 through 100
C) 1 through 100
D) 1 through 101

Answer 2

A

Question 3

Arrays can be passed as parameters to a function by value, but it is faster to pass them by reference.

Answer 3

False

Question 4

What is the output of the following C++ code?

A) 0 1 2 3 4
B) 0 5 10 15
C) 0 5 10 15 20
D) 5 10 15 20

Question 5

The statement int list[25]; declares list to be an array of 26 components, since the array index starts at 0.

Question 6

The array index can be any integer less than the array size.

Question 7

Given the declaration int list[20]; the statement list[12] = list[5] + list[7]; updates the content of the twelfth component of the array list.

Question 8

When you pass an array as a parameter, the base address of the actual array is passed to the formal parameter.

Question 9

Suppose list is a one dimensional array of size 25, wherein each component is of type int. Further, suppose that sum is an int variable. The following for loop correctly finds the sum of the elements of list.

Question 10

Suppose that sales is an array of 50 components of type double. Which of the following correctly initializes the array sales?

A) for (int 1 = 1; j <= 49; j++)
Sales[j] = 0;
B) for (int j = 1; j <= 50; j++)
Sales[j] = 0;
C) for (int j = 0; j <= 49; j++)
Sales[j] = 0.0;
D) for (int j = 0; j <= 50; j++)
Sales[j] = 0.0;

Question 11

If an array index goes out of bounds, the program always terminates in an error.

Question 12

What is the value of alpha[2] after the following code executes?

A) 1
B) 4
C) 5
D) 6

Question 13

Which of the following statements declares alpha to be an array of 25 components of the type int?

A) int alpha[25];
B) int array alpha[25];
C) int alpha[2][5];
D) int array alpha[25][25];

Question 14

In a two-dimensional array, the elements are arranged in a table form.

Question 15

What is the output of the following C++ code?

A) 0 5 10 15 20
B) 5 10 15 20 0
C) 5 10 15 20 20
D) Code results in index out-of-bounds

Question 16

Assume you have the following declaration int beta[50];. Which of the following is a valid element of beta?

A) beta['2']
B) beta['50']
C) beta[0]
D) beta[50]

Question 17

Suppose that list is an array of 10 components of type int. Which of the following codes correctly outputs all the elements of list?

A) for (int j = 1; j < 10; j++)
Cout << list[j] << " ";
Cout << endl;
B) for (int j = 0; j <= 9; j++)
Cout << list[j] << " ";
Cout << endl;
C) for (int j = 1; j < 11; j++)
Cout << list[j] << " ";
Cout << endl;
D) for (int j = 1; j <= 10; j++)
Cout << list[j] << " ";
Cout << endl;

Question 18

What is the output of the following C++ code?

A) 2 4 6 8 10
B) 4 3 2 1 0
C) 8 6 4 2 0
D) 10 8 6 4 2

Question 19

Assume you have the following declaration double salesData[1000];. Which of the following ranges is valid for the index of the array salesData?

A) 0 through 999
B) 0 through 1000
C) 1 through 1001
D) 1 through 1000

Question 20

All components of an array are of the same data type.

Question 21

For a list of length n, the ____________________ sort makes exactly (n(n - 1))/2 key comparisons and 3(n - 1) item assignments.

Question 22

The ____________________ of an array is the address (that is, the memory location) of the first array component.

Question 23

The form of the for loop shown below is called a(n) ____________________ for loop.
for (dataType identifier : arrayName)
statements
​

Question 24

In C++, the null character is represented as ____.

A) '\0'
B) "\0"
C) '0'
D) "0"

Question 25

The word ____________________ is used before the array declaration in a function heading to prevent the function from modifying the array.

Question 26

Which of the following correctly declares and initializes alpha to be an array of four rows and three columns with the component type int?

A) int alpha[4][3] = {{0,1,2} {1,2,3} {2,3,4} {3,4,5}};
B) int alpha[4][3] = {0,1,2; 1,2,3; 2,3,4; 3,4,5};
C) int alpha[4][3] = {0,1,2: 1,2,3: 2,3,4: 3,4,5};
D) int alpha[4][3] = {{0,1,2}, {1,2,3}, {2,3,4}, {3,4,5}};

Question 27

Consider the following declaration: char str[15];. Which of the following statements stores "Blue Sky" into str?

A) str = "Blue Sky";
B) str[15] = "Blue Sky";
C) strcpy(str, "Blue Sky");
D) strcpy("Blue Sky");

Question 28

Given the following declaration: which of the following correctly finds the sum of the elements of the fifth row of sale?

A) sum = 0;
For(j = 0; j < 7; j++)
Sum = sum + sale[5][j];
B) sum = 0;
For(j = 0; j < 7; j++)
Sum = sum + sale[4][j];
C) sum = 0;
For(j = 0; j < 10; j++)
Sum = sum + sale[5][j];
D) sum = 0;
For(j = 0; j < 10; j++)
Sum = sum + sale[4][j];

Question 29

Given the following declaration: which of the following correctly finds the sum of the elements of the fourth column of sale?

A) sum = 0;
For(j = 0; j < 7; j++)
Sum = sum + sale[j][3];
B) sum = 0;
For(j = 0; j < 7; j++)
Sum = sum + sale[j][4];
C) sum = 0;
For(j = 0; j < 10; j++)
Sum = sum + sale[j][4];
D) sum = 0;
For(j = 0; j < 10; j++)
Sum = sum + sale[j][3];

Question 30

Consider the following declaration: char charArray[51];
Char discard;
Assume that the input is:
Hello There!
How are you?
What is the value of discard after the following statements execute?
Cin)get(charArray, 51);
Cin)get(discard);

A) discard = ' ' (Space)
B) discard = '!'
C) discard = '\n'
D) discard = '\0'

Question 31

Consider the following declaration: int alpha[5] = {3, 5, 7, 9, 11};. Which of the following is equivalent to this statement?

A) int alpha[] = {3, 5, 7, 9, 11};
B) int alpha[] = {3 5 7 9 11};
C) int alpha[5] = [3, 5, 7, 9, 11];
D) int alpha[] = (3, 5, 7, 9, 11);

Question 32

Consider the statement int list[10][8];. Which of the following about list is true?

A) list has 10 rows and 8 columns.
B) list has 8 rows and 10 columns.
C) list has a total of 18 components.
D) list has a total of 108 components.

Question 33

Consider the following statement: int alpha[25][10];. Which of the following statements about alpha is true?

A) Rows of alpha are numbered 0...24 and columns are numbered 0...9.
B) Rows of alpha are numbered 0...24 and columns are numbered 1...10.
C) Rows of alpha are numbered 1...24 and columns are numbered 0...9.
D) Rows of alpha are numbered 1...25 and columns are numbered 1...10.

Question 34

Suppose that gamma is an array of 50 components of type int and j is an int variable. Which of the following for loops sets the index of gamma out of bounds?

A) for (j = 0; j <= 49; j++)
Cout << gamma[j] << " ";
B) for (j = 1; j < 50; j++)
Cout << gamma[j] << " ";
C) for (j = 0; j <= 50; j++)
Cout << gamma[j] << " ";
D) for (j = 0; j <= 48; j++)
Cout << gamma[j] << " ";

Question 35

Which of the following correctly declares name to be a character array and stores "William" in it?

A) char name[6] = "William";
B) char name[7] = "William";
C) char name[8] = "William";
D) char name[8] = 'William';

Question 36

A collection of a fixed number of elements (called components) arranged in n dimensions (n >= 1) is called a(n) ____.

A) matrix
B) vector
C) n-dimensional array
D) parallel array

Question 37

After the following statements execute, what are the contents of matrix?

A) 0 0
1 1
2 2
B) 0 1
2 3
4 5
C) 0 1
1 2
2 3
D) 1 1
2 2
3 3

Question 38

Consider the following statement: double alpha[10][5];. The number of components of alpha is ____.

A) 15
B) 50
C) 100
D) 150

Question 39

In row order form, the ____.

A) first row is stored first
B) first row is stored last
C) first column is stored first
D) first column is stored last

Question 40

In a(n) ____________________ data type, each data item is a collection of other data items.