Deck 16: Strings,Characters and Regular Expressions

Question 1

Both stings and characters should be enclosed in double quotes ("x").

Answer 1

False
characters should be enclosed in single quotes ('y').

Question 2

If an integer argument goes beyond the bounds of the array then:

A) an ArgumentOutOfBoundsException is thrown
B) a BoundsException is thrown
C) an ArgumentOutOfRangeException is thrown
D) a RangeException is thrown

Answer 2

C

Question 3

The bounds on a string are always:

A) 0 to string.Length.
B) 1 to string.Length.
C) 0 to string.Length - 1.
D) 1 to string.Length - 1.

Answer 3

C

Question 4

You can use classes Regex and Match to find patterns in a string.

Question 5

The Length property returns the length of a string.

Question 6

Class String and the Char structure are found in the:

A) System.Strings namespace
B) System.Chars namespace
C) System.Text namespace
D) System namespace

Question 7

When a backslash is found within quotes it's considered part of an escape sequence.

Question 8

Characters consist of only the capital and lowercase letters.

Question 9

Strings are not able to be made from an array of characters.

Question 10

In the declaration: string color = "blue";

A) the string literal color is assigned to the string reference "blue"
B) the string reference color is assigned to the string literal "blue"
C) the string literal "blue" is assigned to the string reference color
D) None of the above

Question 11

A string literal:

A) contains only one character.
B) contains numbers rather than letters.
C) is a sequence of characters in double quotation marks.
D) contains exactly its variable name and nothing else.

Question 12

When creating a string object,if a character array and two integers are passed to the constructor,then the created string consists of:

A) the characters of the array from the first value for as many characters as the second value
B) the characters of the array from the first value to the second value
C) all of the characters except those from the first value to the second value
D) there is no such constructor

Question 13

A string is a composition of characters used as one object.

Question 14

When using the string constructor (char,int),the character is repeated in a string as many times as specified by the integer.

Question 15

The Unicode character set has the same characters as ASCII.

Question 16

To create a string literal that excludes escape sequences,use:

A) !"string"
B) @"string"
C) #"string"
D) $"string"

Question 17

string indexers treat strings as:

A) binary code
B) ASCII code
C) arrays of characters
D) a character

Question 18

The string method xe "CopyTo method of class String"CopyTo copies a specified number of characters from a:

A) char array into a string
B) string into a char array
C) string into a int array
D) All of the above

Question 19

The Regex and Match classes are in the System.Text namespace.

Question 20

Which of the following cannot be used to form a word

A) String
B) StringBuilder
E) None of the above

Question 21

The letter 'B' is greater than the letter 'b'.

Question 22

The LastIndexOfAny method scans through the array of characters backwards.

Question 23

If an IndexOfAny method is passed an array of characters it:

A) finds the first occurrence of each letter in the string
B) searches for the first occurrence of any of the characters in the string
C) will search for the first occurrence of the sequence of characters
D) generates an error

Question 24

Concatenating with strings is done with:

A) reserved words.
B) method calls.
C) operator overloading.
D) operator overloading and method calls.

Question 25

strings always know their size.

Question 26

When two integers are passed as arguments to the Substring method,it:

A) returns the characters from the first integer to the second
B) returns as many characters as the second integer starting at the first integer
C) returns as many characters as the first integer starting at the second integer
D) generates an error

Question 27

The IndexOf method returns the indices of all occurrences of the given string.

Question 28

If a method's arguments cause it to access an index of the string that is beyond its length,the program will retrieve whatever is in that memory location.

Question 29

The CompareTo method returns a positive number if the invoking string is less than the argument,a negative number if the invoking string is greater and a 0 if they are the same.

Question 30

If an IndexOfAny method is passed a string it:

A) finds the first occurrence of each letter in the string
B) searches for the first occurrence of any of the characters in the string
C) will search for the first occurrence of the sequence of characters
D) generates an error

Question 31

When using the LastIndexOf method with three arguments,the second parameter specifies:

A) the length of the substring to search
B) the starting index of the string to search
C) the ending index of the string to search
D) the string to search for

Question 32

Method LastIndexOf is used to find the last occurrence of given text in a string.

Question 33

What does the following code display
String example = "C#_Programming";
Console.Write(example.Substring(3,5);

A) _Pr
B) _Prog
C) Pro
D) Progr

Question 34

When comparing "a" to "_" the correct result would be:

A) "a" is greater
B) they are equal
C) "_" is greater
D) there is no way to compare "_" to "a"

Question 35

When a number is passed as an argument for a string indexer it returns that many characters starting from the first.

Question 36

string example = "Deitel";
2) example = example + " Books";

A)This will produce an error
B)This will not produce an error;however,line 2 will not change the string example.
C)This will not produce an error,and the string's value is "DeitelBooks".
D)This will not produce an error,and the string's value is "Deitel Books".

Question 37

The StartsWith and EndsWith methods see if a string starts or ends with the given character or string.

Question 38

A string is less than another string if the first "comes before" the second alphabetically.

Question 39

The Equals string method is used to see if:

A) two strings are exactly the same.
B) two strings start with the same letter.
C) the ASCII sum of the characters in both strings are the same.
D) the two strings have the same letter in the same position anywhere in the strings.

Question 40

The way to find out if two strings are equal is:

A) the Equals method
B) the CompareTo method
C) the == operator
D) All of the above

Question 41

strings cannot be changed.

Question 42

The proper way to convert a string to all lowercase is:

A) STRING = string;
B) ToLower(string);
C) string.ToLower();
D) string.ToLower(string);

Question 43

In order to concatenate a string with another string you can use the Concat method.

Question 44

When the Trim method is passed a character array,it returns a string without any of the characters found within that array.

Question 45

The ToString method can be used to convert a StringBuilder into a string.

Question 46

When passed a white space,method Trim can be used to eliminate all characters from a string.

Question 47

ToUpper(string)is

A) a way of converting a string to all upper cases.
B) a way to make the first letter of every word in a string a capital letter.
C) a way of making one string more important than the rest.
D) a syntax error.

Question 48

string objects are ________ and StringBuilders are __________.

A) immutable, immutable
B) immutable, mutable
C) mutable, immutable
D) mutable, mutable

Question 49

Method Replace can be used to change all occurrences of a desired character to another character.

Question 50

When appropriate,using string objects instead of StringBuilder objects improves performance.

Question 51

In order to set a string to reference nothing the programmer must use:

A) string1 = null
B) string1 = ""
C) string1 = '\0'
D) string1 = ''

Question 52

If two StringBuilder objects contain the same string,then

A) they represent the same location in memory
B) they are two different objects
C) if one changes, so will the other
D) None of the above

Question 53

Method EnsureCapacity returns the capacity of a StringBuilder.

Question 54

When using the Replace method,the first character passed in is the letter to be replaced and the second is what it will be replaced by.

Question 55

Properties Length and Capacity are used to return the number of characters in the StringBuilder and the total length allowed (at that time)of the StringBuilder,respectively.

Question 56

Each StringBuilder has a limit of characters that cannot be exceeded.

Question 57

The ToUpper and ToLower methods can be used to convert a string to all upper or lower case letters,respectively.

Question 58

Concatenating two strings merges the two strings into another string.

Question 59

Class xe "StringBuilder class"StringBuilder is used to:

A) create strings
B) manipulate strings
C) modify strings
D) All of the above

Question 60

Another way to concatenate a string is to use the ampersand (&).

Question 61

Method Insert can be used only on the primitive data types.

Question 62

Method Append is used to add the string representation of various data type values to the end of a StringBuilder.

Question 63

Method AppendFormat can be used to format objects with spaces or using proper mathematical notations.

Question 64

Exceeding the capacity of a StringBuilder causes the program to throw an OutOfRangeException.

Question 65

Method AppendFormat allows:

A) numbers to be inserted in strings.
B) some formatting to be made to the string.
C) anything added to a string.
D) one string to be added to another.

Question 66

If a Replace method is passed ('M','m',0,3)it will:

A) replace any letter 'M' with 'm' in the first 3 characters
B) replace any letter 'M' with 'm' in the first 4 characters
C) replace the first letter 'M' with 'm' in the first 3 characters
D) replace the first letter 'M' with 'm' in the first 4 characters

Question 67

When a quantifier is greedy it:

A) will return a random number, more than one, of results
B) returns half the results
C) returns each result in alphabetical order
D) returns as many results as possible

Question 68

When setting the length of a StringBuilder to a length that's shorter than the current one,an ArgumentOutOfRangeException is thrown.

Question 69

The method IsWhiteSpace is used to determine whether a character is a space or not.

Question 70

Method Remove can be used to delete any part of a StringBuilder.

Question 71

Method Append can be used only on the primitive data types.

Question 72

An example of a struct is:

A) an int
B) a double
C) a char
D) a byte
E) All of the above

Question 73

Method Insert can be used to insert various data types into a given position of a StringBuilder.

Question 74

The char,int,and double types are all defined by structs.

Question 75

Replace is a method that allows the user to change any character in a StringBuilder to the given argument.

Question 76

There are many character methods,some of which are capable of determining whether a character is a letter,a digit,a symbol,or a punctuation.

Question 77

Which is not a StringBuilder method

A) Insert
B) Add
C) Replace
D) ReplaceAll
E) b and d

Question 78

If a number is formatted with the D3 formatter,it means that:

A) the number has to have at least three digits even if they are zero
B) the number has a dollar sign and is at least three digits long
C) creates each number in three dimensions
D) it is an error

Question 79

The IsPunctuation method returns if:

A) it's a period (.) or a comma (,)
B) including all the braces ((, {, and [)
B) it's a period (.), a comma (,), a !, a
C) it's all of
D) anything that's not a letter or a white space

Question 80

structs are like classes in that they encapsulate reference types.