Deck 8: Strings and Vectors

Question 1

All c-strings must be terminated by ________

Answer 1

the null character

Question 2

Vectors and arrays are the same data type.

Answer 2

False

Question 3

The following code declares a vector of characters.
vector characters

Answer 3

False

Question 4

Vector indexing warns about out-of-bounds index values.

Question 5

A vector v will automatically increase the allocated size when more than v.size ) elements are inserted with v.push_back newElement).

Question 6

The following code declares a vector of integers named numbers that reserves space for 100 integers.
vector numbers100);

Question 7

If v is a vector and i is an int variable, then in the following the value of i can be any nonnegative int value:
v[i] = i;

Question 8

You can explicitly use the vector member function resize to increase the capacity of a vector.

Question 9

The function used to 'put two c-strings together into one" is called

Question 10

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

Question 11

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

Question 12

The following declares a c-string and initializes it to "speaker"
char str[]="speaker";

Question 13

If we use an out of range index with a vector, there will be an error message from the compiler.

Question 14

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

Question 15

Using the resize member function alone, you can increase the capacity of an STL vector.

Question 16

The character '\0' is called the __________ character.

Question 17

Vector assignment is well behaved.

Question 18

If vector v has fewer than 24 elements and you call v.resize24) the newly allocated elements are not initialized.

Question 19

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

Question 20

Vectors can have any type as the base type

Question 21

To use the string class, you must include which library?

Question 22

What is the name of the function to convert from a c-string that contains only digits to an integer?

Question 23

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

Question 24

How do you call the function to read a whole line of inputup to 80 characters) from the keyboard into a c-string named str?

Question 25

____________ can be thought of as an array that can grow and shrink as needed.

Question 26

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

Question 27

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

Question 28

What is the difference between strcat and strncat?

Question 29

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

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

Question 30

How do you concatenate two string values str1, str2)?

Question 31

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

Question 32

To compare two c-strings you use the __________ function.

Question 33

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

Question 34

The declaration of an STL vector doubleVec that can hold values of type double, one writes ______________.

Question 35

A character array terminated with the null character is most correctly called

A) a c-string
B) a character array
C) a string
D) none of the above

Question 36

To change the space already allocated for a vector, one uses the ______________ member function.

Question 37

To convert an integer to a variable of type string one can use the C++11 function _____________.

Question 38

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

Question 39

To convert a string object that stores an integer to a variable of type int one can use the C++11 function ____________.

Question 40

To change the size of a vector, one uses the ______________ member function.

Question 41

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

A) There are only 3 values in the braces
B) The single quotes should be double quotes
C) The values do not constitute a c-string
D) nothing

Question 42

The notation vector means that the vector is

A) an array
B) a template class
C) primitive data type
D) all of the above

Question 43

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

A) a garbage string
B) the empty string
C) the null character
D) unknown

Question 44

strcmpfirst, second) returns

A) <0 if first < second, 0 if first == second, positive otherwise
B) true if first=second, false otherwise
C) nothing, it's a void function
D) >0 if first < second, 0 if first > second, <0 otherwise

Question 45

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

A) 0
B) 10
C) 100
D) unknown

Question 46

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

A) str.getLength)
B) str.length)
C) lengthstr)
D) getLengthstr)

Question 47

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

A) vector strings names;
B) vector string;
C) vector names;
D) all of the above

Question 48

Which assignment statements will copy the value " toaster" into a string variable str1)?

A) strcpystr1,"toaster");
B) str1 = "toaster";
C) str1 = toaster;
D) str1 += toaster;

Question 49

What is wrong with the following code fragment?
Char str1[10]="Mark", str2[15]="What's my name";
Strcpystr1,str2);

A) Nothing
B) str2 has white space in it
C) str1 does not have enough room
D) str2 does not have enough room

Question 50

If the name of a file to open is in the string variable name fileName, which of the following will correctly open the file for output?

A) out_file.openfileName);
B) out_file.open"fileName");
C) fileName.openoutfile);
D) out_file.openfileName.c_str));

Question 51

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

A) str="toaster;
B) str=toaster;
C) strcpystr,"toaster");
D) str.strcpy"toaster");

Question 52

If you want to read into a c-string, you must ensure that the user does not enter more characters than

A) The size of the c-string
B) The size of the c-string + 1
C) The size of the c-string -1
D) It doesn't matter.

Question 53

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

A) getlinefin, line);
B) fin.getlineline);
C) fin.getlineline,'\n\');
D) fin.getlineline,80);

Question 54

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

A) numbers[numbers.size)+1] = newValue;
B) numbers = newValue;
C) numbers.pushBacknewValue);
D) numbers.push_backnewValue);

Question 55

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?

A) str3);
B) str.at3);
C) str[3];
D) All of the above

Question 56

To declare a c-string and initialize it to the value of "phonebook",

A) char s1=phonebook;
B) char s1[10]="phonebook";
C) c-string phonebook;
D) char s1[10]=phonebook;

Question 57

The base type for a vector can be

A) int
B) float or double
C) char
D) any data type

Question 58

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

A) it skips all white spaces
B) it skips only new lines
C) it reads everything on the line
D) it reads as many characters that will fit into the c-string

Question 59

What is the difference between strcmp and strncmp?

A) No difference
B) they both compare, one expects an integer for the number of characters to compare.
C) one copies, the other compares
D) They are in different libraries

Question 60

Given the following declarations, which of the following is legal syntax?
String str="Your name";
Char c_string[20]="My name";

A) str = c_string;
B) c_string = str;
C) strcpyc_string, str.c_str));
D) strcpyc_string, str);
E) A and C

Question 61

What is the value of numbers.size) after the following code?
Vector numbers;
Numbers.reserve100)

A) 0
B) 10
C) 100
D) unknown

Question 62

Given the following code, what is the correct statement to insert the string str2 into str1, directly after the 'd'?
String str1="abcdefg";
String str2="ABCDE";

A) str1.insert4,str2);
B) str2.insert4,str1);
C) insertstr1,4)=str2;
D) insertstr2,4)=str1;

Question 63

What is the value of numbers.size) after the following code?
Vector numbers100);

A) 0
B) 10
C) 100
D) unknown

Question 64

In a vector, which of the following statements is true?

A) Indexing vector access is range checked.
B) The range of legal index values for a vector is 0 to the value of v.size)-1
C) To add a value use the member function v.push_front )
D) To increase or decrease a vector's size v.new_sizenewSize);

Question 65

If the capacity of a vector named names is 20 and the size of names is 19, which of the following statements are legal?

A) names.push_back"myName");
B) names[18]="myNmae";
C) all of the above
D) none of the above

Question 66

If a vector named numbers has 20 elements in it, what is the result of executing the following statement?
Numbers.resize10);

A) no change
B) the first 10 elements are removed
C) the last 10 elements are removed
D) this causes a run-time error

Question 67

Which of the following are correct statements about vector member functions studied in this chapter?

A) push_front baseTypeObject) puts object on the front of a vector
B) indexing uses index values 0 through size )
C) size ) tells how many base type objects have been inserted into the vector
D) When a vector runs out of space all implementations are required to double the amount of allocated space .

Question 68

What is the value of numbers.capacity) after the following code?
Vector numbers;
Numbers.reserve100)

A) 0
B) 10
C) 100
D) unknown

Question 69

When a vector is assigned to another vector

A) only the location of the vector is copied
B) all the values in the vector are copied
C) if there is not enough room in the left-hand vector, then not all the values from the right side are copied
D) none of the above