Question 1

The ofile() function opens a data file.

Accepted Answer

The correct function for opening a file in Python is `open()`, not `ofile()`.

Question 2

The ____ function controls the number of significant digits you see in the output.
A) setw()
B) setprecision()
C) precision()
D) width()

Accepted Answer

C

Question 3

The ____ function defines the size of the output field in which the next output will be displayed.
A) setw()
B) setprecision()
C) precision()
D) width()

Accepted Answer

The width() function defines the width of the output field, specifying the minimum number of characters that should be displayed for the next output. This ensures that the output is properly formatted and aligned. Option A (setw()) is used to set the width of the next output to be displayed which would require a separate function call. Option B (setprecision()) and C (precision()) are used to set the precision level of floating-point numbers.

Question 4

The ____ manipulator specifies the number of significant digits to display.
A) setw()
B) setprecision()
C) precision()
D) width()

Accepted Answer

The setprecision() manipulator specifies the number of significant digits to display in floating-point numbers. The other options, setw() and width(), set the field width for the output, while precision() is used to set the precision of floating-point numbers in scientific notation.

Question 5

Temporary data storage exists in computer memory; it is lost when power is lost.

Accepted Answer

Temporary data storage, also known as volatile memory, is stored in computer memory and requires power to maintain the data. As soon as power is lost, the memory is cleared, and the data is lost.

Question 6

The cin.get() statement can retrieve any character, including letters, numbers, punctuation, and white space such as the character generated by pressing the Enter key.

Accepted Answer

The cin.get() statement can retrieve any character, including letters, numbers, punctuation, and white space such as the character generated by pressing the Enter key.

Question 7

The ____ function reads a line of text at the address represented by the first argument to the function until it reaches either the length used as the second argument or the character used as the third argument.
A) open()
B) ignore()
C) get()
D) getline()

Accepted Answer

The getline() function reads a line of text at the address represented by the first argument until it reaches either the length used as the second argument or the character used as the third argument. Therefore, D is the correct choice. The other choices (A, B, and C) do not have this functionality.

Question 8

____ I/O is unformatted; that is, bytes are transferred into and out from memory without regard to the type of data they represent.
A) Low-level
B) High-Level
C) Primitive
D) Advanced

Accepted Answer

Low-level I/O is unformatted and deals with bytes directly, while high-level I/O involves formatted data and uses functions that translate between data types. Primitive and advanced are not accurate terms for describing I/O.

Question 9

____ I/O is formatted; that is, bytes are grouped into meaningful units such as integers, doubles, and class object types.
A) Low-level
B) High-Level
C) Primitive
D) Advanced

Accepted Answer

High-level I/O is formatted, meaning data is grouped into meaningful units such as integers, doubles, and class object types. Low-level I/O deals with raw data at the byte level. Primitive and advanced I/O do not describe whether or not the data is formatted.

Question 10

The ____ function takes arguments that set the bits of cout ; that is, the arguments turn the bits in the format flag on.
A) setw()
B) setprecision()
C) setf()
D) unsetf()

Accepted Answer

The setf() function is used to set the bits of cout based on the arguments passed to it. The setw() function is used to set the width of the field for the next output. The setprecision() function is used to set the precision for floating point output. The unsetf() function is used to unset the bits in cout that are set by the setf() function.

Question 11

The ____ function takes a character argument and returns a reference to the object that invoked the function.
A) open()
B) ignore()
C) get()
D) getline()

Accepted Answer

The get() function is used to read a character from the input stream and returns a reference to the stream object, allowing for method chaining or further operations.

Question 12

The ____ manipulator turns on bit codes for the attributes named as arguments.
A) setw()
B) setprecision()
C) setiosflags()
D) resetiosflags()

Accepted Answer

The setiosflags() manipulator turns on bit codes for the attributes named as arguments. It is used to set formatting flags for a stream such as setting the basefield flag to octal or hex. The other manipulators (setw() and setprecision()) are used for setting the output width and precision respectively and do not manipulate bit codes for stream attributes. resetiosflags() is used to turn off the specified flags.

Question 13

No matter how many decimal positions a number contains, C++ will display five positions if you do not explicitly set a precision for output.

Accepted Answer

By default, C++ will display six decimal places for floating point numbers unless the precision is explicitly set using the std::setprecision function from the iomanip library.

Question 14

The ____ function skips any additional characters left in the input stream after data is accepted.
A) open()
B) ignore()
C) unsetf()
D) getline()

Accepted Answer

The ignore() function skips any additional characters left in the input stream after data is accepted.

Question 15

A ____ is a way to create a shorter, easier-to-remember nickname for an unwieldy identifier.
A) fixed
B) showbase
C) setf()
D) typedef

Accepted Answer

Typedef is used to create shorter aliases for data types, structures or user-defined data types. It helps to create shorter, more easily-readable and maintainable code.

Question 16

The && and || operators are used for shifting bits in some contexts.

Accepted Answer

The && and || operators are logical operators used for Boolean operations. The bitwise operators used for shifting bits are << and >>.

Question 17

Format flags are also known as state flags.

Accepted Answer

This statement is true. Format flags are also often referred to as state flags in programming.

Question 18

The ____ manipulator allows you to set the width of a field for output.
A) setw()
B) setprecision()
C) setf()
D) width()

Accepted Answer

The setw() manipulator is specifically designed to set the width of a field for output. The setprecision() manipulator is used to set the number of digits after the decimal point when outputting floating-point values. The setf() manipulator is a more general-purpose manipulator that allows you to set various formatting flags, but it doesn't specifically set the width of a field. The width() manipulator is used with setw() to specify the width of the field.

Question 19

The ____ function can be used to deselect a bit in the format flag.
A) setw()
B) setprecision()
C) setf()
D) unsetf()

Accepted Answer

The unsetf() function is used to deselect a bit in the format flag. This function is usually used after using setf() to set a format flag, in order to turn off a specific flag.

Question 20

All format flags begin with iosf:: .

Accepted Answer

Format flags in C++ begin with `std::ios_base::`, not `iosf::`.

Quiz 13: Advanced Input and Output

The ofile() function opens a data file.

The ____ function controls the number of significant digits you see in the output.

The ____ function defines the size of the output field in which the next output will be displayed.

The ____ manipulator specifies the number of significant digits to display.

Temporary data storage exists in computer memory; it is lost when power is lost.

The cin.get() statement can retrieve any character, including letters, numbers, punctuation, and white space such as the character generated by pressing the Enter key.

The ____ function reads a line of text at the address represented by the first argument to the function until it reaches either the length used as the second argument or the character used as the third argument.

____ I/O is unformatted; that is, bytes are transferred into and out from memory without regard to the type of data they represent.

____ I/O is formatted; that is, bytes are grouped into meaningful units such as integers, doubles, and class object types.

The ____ function takes arguments that set the bits of cout ; that is, the arguments turn the bits in the format flag on.

The ____ function takes a character argument and returns a reference to the object that invoked the function.

The ____ manipulator turns on bit codes for the attributes named as arguments.

No matter how many decimal positions a number contains, C++ will display five positions if you do not explicitly set a precision for output.

The ____ function skips any additional characters left in the input stream after data is accepted.

A ____ is a way to create a shorter, easier-to-remember nickname for an unwieldy identifier.

The && and || operators are used for shifting bits in some contexts.

Format flags are also known as state flags.

The ____ manipulator allows you to set the width of a field for output.

The ____ function can be used to deselect a bit in the format flag.

All format flags begin with iosf:: .