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Terms in this set [25]
Data stored here disappears once the program stops running or the computer is powered down.
in RAM
In order, the three-step process of using a file in a C++ program involves:
open the file, read/write/save data, close the file
This data type can be used to create files and write information to them but cannot be used to read information from them.
ofstream
This data type can be used to create files, read data from them, and write data to them.
fstream
Which statement opens a file and links it to a file stream object?
file.open["c:\\filename.txt"];
What is true about the following statement?
out.open["values.dat", ios::app];
If the file already exists, its contents are preserved and all output is written to the end of the file.
Which of the following statements opens the file info.txt for both input and output?
dataFile.open["info.txt", ios::in | ios::out];
The ________ marker is the character that marks the end of a file, and is automatically written when the file is closed.
End of File [EOF]
This state bit can be tested to see if the end of an input stream is encountered.
ios::eofbit
This member function reads a single character from a file.
get
This member function can be used to store binary data to a file.
write
To access files from a C++ program, you must use this directive:
#include
To set up a file to perform file I/O, you must declare:
one or more file stream objects
ofstream, ifstream, and fstream are:
data types
This data type can be used to create files and read information from them into memory.
ifstream
Outside of a C++ program, a file is identified by its ________. Inside a C++ program, a file is identified by a ________.
name, file stream object
When used by itself, this access flag causes a file's contents to be deleted if the file already exists.
ios::out
Which statement opens a file in such a way that information will only be written to its end?
dataFile.open["info.dat", ios::out | ios::app];
Closing a file causes any unsaved information still held in the file buffer to be:
saved to the file
The end-of-file marker is automatically written:
when a file is closed
When a file is opened, the file stream object's "read position" is:
at the beginning of the file
All stream objects have these, which indicate the condition of the stream.
error state bits
This state bit is set when an attempted operation has failed.
ios::failbit
This member function writes a single character to a file.
get
This term means non-sequentially accessing information in a file.
random access
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Verified questions
COMPUTER SCIENCE
Write an Employee class that keeps data attributes for the following pieces of information: $$ \begin{matrix} \text{• Employee name}\\ \text{• Employee number}\\ \end{matrix} $$ Next, write a class named ProductionWorker that is a subclass of the Employee class. The ProductionWorker class should keep data attributes for the following information: $$ \begin{matrix} \text{• Shift number [an integer, such as 1, 2, or 3]}\\ \text{• Hourly pay rate}\\ \end{matrix} $$ The workday is divided into two shifts: day and night. The shift attribute will hold an integer value representing the shift that the employee works. The day shift is shift 1 and the night shift is shift 2. Write the appropriate accessor and mutator methods for each class. Once you have written the classes, write a program that creates an object of the ProductionWorker class and prompts the user to enter data for each of the object’s data attributes. Store the data in the object and then use the object’s accessor methods to retrieve it and display it on the screen.
Verified answer
COMPUTER SCIENCE
A certain CS professor gives 5-point quizzes that are graded on the scale 5-A, 4-B, 3-C, 2-D, 1-F, 0-F. Write a program that accepts a quiz score as an input and prints out the corresponding grade.
Verified answer
COMPUTER SCIENCE
Write a program that converts temperatures from Fahrenheit to Celsius.
Verified answer
COMPUTER SCIENCE
This function is used to check whether an object is an instance of a specific class or a subclass of that class. a. isinstance b. isobject c. isreference d. _ _str_ _
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