Question 1

For an ifstream object A, a class type B and a local variable of type B called C, the proper way to read in one B object from A into C is: A) A.read &C, sizeof B ) ); B) A.read reinterpret_cast< char * > &C ), sizeof B ) ); C) A.read reinterpret_cast< char * > &C ), B ); D) A.read char * &C ), sizeof B ) );

Accepted Answer

The proper way to read in one object of type B from an ifstream object A into a local variable of type B called C is to use A.read with reinterpret_cast< char *> &C as the first argument, and sizeof B as the second argument. This is because the read function expects a pointer to a buffer of characters, which is why we need to cast the address of C to char * using reinterpret_cast. Additionally, we need to specify the size of the object being read in, which is why we use sizeof B as the second argument.

Question 2

Select the false statement. The reinterpret_cast operator:&#10;A) Changes the value of the object to which its operand points.&#10;B) Performs its operation at compile time.&#10;C) Is compiler-dependent and can cause programs to behave differently on different platforms.&#10;D) Is easy to use to perform dangerous manipulations that could lead to serious execution-time errors.

Accepted Answer

Reinterpret_cast does not change the value of the object to which its operand points; it merely reinterprets the bit pattern of the object as a different type.

Question 3

Select the false statement.&#10;A) C++ includes object serialization by default.&#10;B) After a serialized object has been written to a file, it can be read from the file and deserialized-that is, the type information and bytes that represent the object and its data can be used to recreate the object in memory.&#10;C) When an object is output to disk, only the values of its attributes are output.&#10;D) None of the above.

Accepted Answer

C++ does not include object serialization by default; it requires additional libraries or custom implementation for serialization.

Question 4

Select the proper object type.&#10;__________ file &#34;file.dat&#34;, ios::in | ios::out );&#10;A) iostream&#10;B) fstream&#10;C) ofstream&#10;D) ifstream

Accepted Answer

The combination of ios::in and ios::out flags indicates that we want to open the file for both input and output operations. The fstream object provides us with the capability to perform both input and output operations. Therefore, fstream is the best choice for this scenario.

Question 5

Random access files are more effective than sequential files for:&#10;A) Instant access to data.&#10;B) Updating data easily.&#10;C) Inserting data into the file without destroying other data.&#10;D) All of the above.

Accepted Answer

Random access files allow for instant access to data, updating data easily, and inserting data into the file without destroying other data. Therefore, all of the options are correct.

Question 6

A random access file is organized most like an):&#10;A) Array.&#10;B) Object.&#10;C) Class.&#10;D) Pointer.

Accepted Answer

A random access file is similar to an array as it allows direct access to any element based on its position. It is not similar to an object or class as it does not have methods or properties, and it is not similar to a pointer as it does not hold a memory address.

Question 7

To write fixed-length records, use file open mode:&#10;A) ios::app&#10;B) ios::ate&#10;C) ios::trunc&#10;D) ios::binary

Accepted Answer

The ios::binary mode ensures that the file is opened in binary mode rather than text mode, which is necessary for writing fixed-length records.

Question 8

Which of the following functions would not be used to write data randomly to a random access file?&#10;A) tellg&#10;B) seekp&#10;C) write&#10;D) All of the above would be used.

Accepted Answer

The function tellg returns the current get position of the input sequence, which is not relevant for writing data to a random access file. The functions seekp and write are both relevant for writing data to a random access file, as seekp can be used to move the put position to a specific location in the file and write can be used to write data to that location.

Question 9

Multiple file open modes are specified to the fstream constructor by separating each open mode from the next with the bitwise inclusive or operator __________.&#10;A) ||&#10;B) ^&#10;C) & .d |

Accepted Answer

The bitwise inclusive or operator (|) is used to combine multiple file open modes in the fstream constructor. This allows for different modes to be set such as read mode, write mode, and binary mode simultaneously. The other operators (^) and (&) are not typically used for combining open modes.

Question 10

In the text, we created a random access file. When we read the data back sequentially, we discovered that in the process of creating the random-access file, the data was__________.&#10;A) merged.&#10;B)duplicated.&#10;C) sorted.&#10;D) filtered.

Accepted Answer

Random access files often involve sorting data to allow for efficient retrieval, which can result in the data being sorted when read back sequentially.

Question 11

Select the false statement. The write function:&#10;A) Creates unformatted data.&#10;B) Expects data type const char * as its first argument.&#10;C) Writes to files in hexadecimal format.&#10;D) Takes an argument of type size_t.

Accepted Answer

The answer of Select the false statement. The write function:&#10;A)...

Deck 17: File Processing