Question 1

The C++ compiler performs strict array bounds checking when it encounters an array of characters.

Accepted Answer

The C++ compiler does not perform strict array bounds checking when it encounters an array of characters. It is possible to access elements beyond the bounds of the array without triggering a compiler error or warning. However, doing so can result in undefined behavior and potentially unexpected program crashes.

Question 2

To test whether a character is a printable character, use the __________ function.
A) isprint
B) isprintable
C) isprintok
D) isoktoprint
E) None of these

Accepted Answer

The correct function to test if a character is a printable character is isprint().

Question 3

If an uppercase character is passed as an argument to the toupper function, the result will be an uppercase character.

Accepted Answer

The toupper function is used to convert a lowercase character to an uppercase character. If an uppercase character is passed as an argument, the function will still return the same uppercase character.

Question 4

C++11 introduces a function named to_string that converts a numeric value to a string object.

Accepted Answer

C++11 indeed introduces a function named to_string that converts a numeric value to a string object.

Question 5

The itoa function is similar to atoi but it works in reverse.

Accepted Answer

The itoa function is used to convert an integer to a string, whereas the atoi function converts a string to an integer. Therefore, itoa and atoi do not work in reverse of each other, making option A true.

Question 6

The isdigit function will return true if the argument is a digit between 0 and 9.

Accepted Answer

The isdigit function in C++ returns true if the argument is a digit between 0 and 9. Hence, the statement "isdigit function will return true" is correct.

Question 7

When using the strcat function you must be careful not to overwrite the bounds of an array.

Accepted Answer

The strcat function appends the second string to the end of the first string, but it does not check if the destination array has enough space to accommodate the resulting string. This means that if the destination array is not large enough to hold the combined string, the function will write outside the bounds of the array, leading to unpredictable behavior and potential security vulnerabilities. Therefore, it is essential to ensure that the destination array is large enough to hold the resulting string and to use safe string manipulation functions like strncat or strncpy instead.

Question 8

The strlen function returns a C-string's length and adds one for \0.

Accepted Answer

The strlen function returns the length of a C-string not including the null terminator '\0'.

Question 9

The function that accepts a pointer to a C-string as an argument and returns the length of the C-string, not including the null terminator is
A) numchar
B) strlength
C) strlen
D) countstring
E) None of these

Accepted Answer

The function that returns the length of a C-string (sequence of characters terminated by a null character) is the standard library function `strlen`. This function takes a pointer to a C-string as an argument and returns the number of characters in the string, excluding the null terminator. Option A, numchar, is not a standard library function for finding the length of a string. Option B, strlength, is similar to strlen but not a standard library function. Option D, countstring, is not a standard library function for finding the length of a string. Option E, none of these, is not the correct answer as there is at least one correct option.

Question 10

A test using the isupper function will return False if the argument is an uppercase character.

Accepted Answer

The isupper function will return True if the argument is an uppercase character.

Question 11

The following string that uses a semicolon as a delimiter contains four tokens:
"apple;cherry;lemon cream"

Accepted Answer

The string "apple;cherry;lemon cream" contains three tokens when using a semicolon as a delimiter: "apple", "cherry", and "lemon cream".

Question 12

To test whether a character is a numeric digit character, use the __________ function.
A) isnumber
B) notAlpha
C) isnumeric
D) isdigit
E) None of these

Accepted Answer

The isdigit function is used to check if a character is a numeric digit character. The function returns True if the character is a digit and False otherwise.

Question 13

By being able to pass arrays as arguments, you can write your own functions for processing C-strings.

Accepted Answer

Yes, by passing arrays as arguments, we can write functions to process C-strings. In fact, many C string functions like strlen(), strcpy(), etc. take C-strings (i.e., arrays of characters) as arguments.

Question 14

Although C++ provides ample library functions to handle numeric values, we must write all of our own functions to manipulate character values.

Accepted Answer

C++ provides several library functions to handle character values, including functions for converting between upper and lowercase, checking for alphabetic, numeric, or whitespace characters, and comparing characters.

Question 15

The ftoa function converts a floating-point value to an ASCII value.

Accepted Answer

The ftoa function converts a floating-point value to a string representation, not an ASCII value. ASCII values represent individual characters, not entire numbers.

Question 16

You may use the <, >, <=, >=, ==, and != relational operators to compare string objects.

Accepted Answer

The relational operators can be used to compare string objects in Python.

Question 17

The C++ library provides functions for converting a string representation of a number to a numeric data type and vice-versa.

Accepted Answer

The C++ library provides functions for converting a string containing a number to a numeric data type like stoi() and stod(), and functions for converting a numeric data type to a string representation like to_string().

Question 18

The null terminator stands for ASCII code
A) 57
B) 100
C) 1000
D) 0
E) None of these

Accepted Answer

The null terminator is represented by the ASCII code 0, which indicates the end of a string.

Question 19

The escape sequence that represents the null terminator is
A)

B) 	
C) \0
D) nullptr
E) None of these

Accepted Answer

The null terminator is represented by the escape sequence '\0'. This signifies the end of a string in C++ and is commonly used when creating and manipulating strings. Choice A (
) represents a newline character, choice B (	) represents a tab character, choice D (nullptr) is a keyword in C++ used to represent a null pointer, and choice E (None of these) is not applicable in this case as the correct answer is C.

Question 20

The string class's front and back member functions were introduced in C++11.

Accepted Answer

The front and back member functions were introduced in C++11 as part of the standard library for the string class. The front function returns a reference to the first character in the string, while the back function returns a reference to the last character in the string.

Quiz 10: Characters, C-Strings, and More About the String Class