Ch.8

Question 1

What is the value of numbers.capacity( ) after the following code?

vector < float > numbers;
numbers.reserve(100)

Answer 1

0

Question 2

When a vector is assigned to another vector

Answer 2

all the values in the vector are copied.

Question 3

What is the value of str after the following code?
string str;

Answer 3

the empty string

Question 4

Which is the proper way to determine how many characters are in the string variable named str?

Answer 4

str.length( )

Question 5

What is the difference between strcmp and strncmp?

Answer 5

They both compare, one expects an integer for the number of characters to compare.

Question 6

What is the value of numbers.size( ) after the following code?

vector < float > numbers;
numbers.reserve(100)

Answer 6

0

Question 7

Which of the following will print out the value in str?
char str[30];
cin >> str;

Answer 7

cout << str;

and

int i = 0;
while(i < 30 && str[i] != ‘\0’)
cout << str[i];

Question 8

How can you assign the value “toaster” to a c-string name str of size 10?

Answer 8

strcpy(str,”toaster”);

Question 9

strcmp(first, second) returns

Answer 9

< 0 if first < second, 0 if first == second, positive otherwise.

Question 10

What is wrong with the following attempted c-string declaration and initialization?
char str1[5] = {‘a’, ‘b’, ‘c’};

Answer 10

The values do not constitute a c-string.

Question 11

Which of the following returns the fourth character in the string variable named str and checks if there is a fourth character in the string?

Answer 11

str.at(3);

Question 12

What is wrong with the following code fragment?
char str1[10] = “Mark”, str2[15] = “What’s my name”;
strcpy(str1,str2);

Answer 12

str1 does not have enough room.

Question 13

When the extraction operator is used to read data into a string,

Answer 13

it skips all white spaces.

Question 14

Which of the following declarations correctly creates a c-string that can hold the value “phonebook”?

A) char s1[9]; B) char s1;
C) char s1 = 10; D) char s1[10];

Answer 14

char s1[10];

Question 15

The base type for a vector can be

Answer 15

any data type.

Question 16

Which assignment statements will copy the value “ toaster” into a string variable (str1)?

Answer 16

str1 = “toaster”;

Question 17

What is the value of numbers.size( ) after the following code?

vector < float > numbers(100);

Answer 17

100

Question 18

What is the proper way to declare a vector of strings named names?

Answer 18

vector names;

Question 19

To add an element to a vector of integers named numbers at the next available position in the vector, you would use ________.

Answer 19

numbers.push_back(newValue);

Question 20

Which of the following would correctly read an entire line from an input file stream named fin into a string variable named line?

Answer 20

getline(fin, line);

Question 21

The character ‘\0’ is called the ________ character

Answer 21

null

Question 22

The function used to “put two c-strings together into one” is called ________.

Answer 22

strcat

Question 23

All c-strings must be terminated by ________.

Answer 23

‘\0’

Question 24

What is the code to print out the third character in a string variable named str?

Answer 24

cout << str[2];

Question 25

Which string function returns the first occurrence of str1 in a string named str?

Answer 25

find

Question 26

What is the c-string function to determine the number of characters in a c-string?

Answer 26

strlen

Question 27

The c-string to number conversion functions are in the ________ library

Answer 27

cstdlib

Question 28

What is the difference between strcat and strncat?

Answer 28

strncat will concatenate at most n letters (where n has an appropriate value).

Question 29

The ________ class lets you treat string values and variables like other pre-defined data types (such as int).

Answer 29

string

Question 30

To use the functions for manipulating and comparing c-strings, you must include ________.

Question 31

To compare two c-strings you use the ________ function

Answer 31

strcmp or strncmp

Question 32

Using the == operator on a string variable results in the same value as using strcmp on two c-strings.

Answer 32

False

Question 33

Vectors and arrays are the same data type.

Answer 33

False

Question 34

The following declares a c-string variable that will hold 10 letters.
char str[10];

Answer 34

False

Question 35

Using the [i] on a string variable does not check for illegal values of i.

Answer 35

True

Question 36

A string variable and a c-string are the same data type.

Answer 36

False

Question 37

The following code declares a vector of integers named numbers that reserves space for 100 integers.
vector < int > numbers(100);

Answer 37

True