Deck 18: Class String and String Stream Processing

Question 1

Which of the following is false?

A) If a string is converted to a C-style array using data, modifying the string could cause the pointer previously returned by data to become invalid.
B) Converting a string containing one or more null characters to a C-style string can cause logic errors.
C) c_str returns a character array of the same length as the string object it is called on.
D) copy implicitly converts a string to a non-null terminated character array.

Answer 1

C

Question 2

Which of the following is not overloaded for strings?

A) -=
B) >>
C) +=
D) getline)

Answer 2

A

Question 3

Which of the following returns a bool?

A) length
B) empty
C) capacity
D) resize

Answer 3

B

Question 4

The arguments passed to replace do not include:

A) The subscript of the element where the replace operation ends.
B) The subscript of the element where the replace operation begins.
C) A replacement character string from which a substring is used to replace characters.
D) The element in the replacement character string where the replacement substring begins.

Question 5

If string s1 has the value "computer" and string s2 has the value "promise", which call to insert will produce the string "compromise"?

A) s1.insert 4, s2, 0, string::npos );
B) s1.insert string::npos, s2, 0, 4 );
C) s2.insert 0, s1, 0, 3 );
D) s2.insert 3, s1, 0, 3 );

Question 6

If string s contains "antidisestablishmentarianism", then s.substr 7, 13 ) would be:

A) "establish"
B) "ishmenta"
C) "establi"
D) "establishment"

Question 7

What type of value is returned by the overloaded equality and relational operators for strings?

A) int
B) bool
C) double
D) null

Question 8

The function call string1.erase 5 ) will:

A) Return a copy of string1 minus the character that occupied position 5.
B) Erase all characters up to and including the character in position 5 from string1.
C) Erase all characters starting from and including the character in position 5 to the end of string1.
D) Return a copy of string1 minus every fifth character.

Question 9

Which of the following would not return string::npos when used on the string s which contains "rack":

A) s.find_first_not_of "crackling" );
B) s.find_first_not_of "packrat" );
C) s.rfind "car" );
D) s.find "ack" );

Question 10

Strings:

A) Can use the subscript operator to access individual characters.
B) Must be null-terminated.
C) Are pointers.
D) Have a first subscript of 1.

Question 11

If string s1 is lexicographically greater than string s2, then the value returned by s2.compare0, s2.size), s1) must be?

A) 0
B) -1
C) A negative number.
D) A positive number.

Question 12

Class string has member function __________ to interchange the data stored in two string objects

A) exchange
B) switch
C) swap
D) copyto

Question 13

Which of the following cannot be used to concatenate strings?

A) +
B) +=
C) append
D) assign

Question 14

Which of the following searches through a string object from right-to-left?

A) find
B) find_first_of
C) find_last_of
D) find_first_not_of

Question 15

Iterators do not:

A) Allow the characters to be modified.
B) Allow backward traversal of strings.
C) Have range checking.
D) Have syntax similar to pointer operations.

Question 16

Given the strings defined below, which statement will not return 0?
String s1 = "Mighty Mouse";
String s2 = "Mickey Mouse";

A) s1.compare 0, 3, s2, 0, 3 );
B) s1.compare 7, 5, s2, 7, 5 );
C) s1.compare 8, 12, s2, 8, 12 );
D) s1.compare 7, 11, s2, 7, 11 );

Question 17

Which function changes the actual string stored in the string object i.e., is not a const member function)?

A) length
B) empty
C) capacity
D) resize

Question 18

Which of the following is an invalid definition?

A) string sa = "computers";
B) string sb "computers" );
C) string sc 'c' );
D) string sd 9, 'c' );

Question 19

The total number of elements that can be stored in a string without increasing its current amount of allocated memory is called its:

A) Size.
B) Length.
C) Capacity.
D) Maximum size.

Question 20

Which of the following is not an argument of the assign member function?

A) The start location.
B) The number of characters to copy.
C) The end location.
D) The string to copy.

Question 21

The capabilities of inputting and outputting strings in memory are known as:

A) String i/o manipulation.
B) String stream processing.
C) Character handling.
D) Dynamic string operations.

Question 22

Which of the following does not apply to an istringstream object?

A) Data is stored in the object as characters.
B) Input from the object works identically to input from any file stream.
C) Data in a string can be appended to it.
D) It is used to inputs data from a string in memory to program variables.

Question 23

All of the following are true of an ostringstream object except that:

A) It uses a string to store output data.
B) A stream insertion operation cannot be used to append additional data to it.
C) The string data it stores is dynamically allocated.
D) The data it stores can be accessed using the function str.

Question 24

What is the code for a loop that iterates from the end of a string toward the beginning?

A) string::reverse_iterator i = s.begin) while i != s.end) )
{
Cout << *i;
++i;
}
B) string::reverse_iterator i = s.rbegin) while i != s.rend) )
{
Cout << *i;
++i;
}
C) string::reverse_iterator i = s.end) while i != s.begin) )
{
Cout << *i;
--i;
}
D) string::reverse_iterator i = s.rbegin) while i != s.rend) )
{
Cout << *i;
--i;
}

Question 25

Which of the following provides bounds checking?

A) at
B) iterator
C) reverse_iterator
D) [ ]

Question 26

String iterators:

A) Must be dereferenced in order to access the character at each location.
B) Are not range checked.
C) Come in const and non-const forms.
D) All of the above.