Deck 8: Strings and Vectors

Question 1

Vector assignment is well behaved.

Answer 1

True

Question 2

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;

Answer 2

False

Question 3

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

Answer 3

True

Question 4

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

Question 5

Vectors can have any type as the base type

Question 6

The following code declares a vector of characters.
vector characters

Question 7

All c-strings must be terminated by ________

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

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

Vectors and arrays are the same data type.

Question 19

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

Question 20

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

Question 21

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 22

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

Question 23

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

Question 24

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 25

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

Question 26

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 27

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 28

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

Question 29

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 30

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

Question 31

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 32

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

Question 33

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

Question 34

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 35

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 36

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

Question 37

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

Question 38

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 39

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

Question 40

What is the difference between strcat and strncat?

Question 41

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 42

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 43

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 44

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 45

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

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

Question 46

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 47

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 48

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 49

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 50

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

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

Question 51

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 52

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 53

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 54

The base type for a vector can be

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

Question 55

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

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

Question 56

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 57

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

Question 58

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 59

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 60

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

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

Question 61

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 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

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 .