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Welcome to the Deciphering Program Data MCQs Page

Dive deep into the fascinating world of Deciphering Program Data with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Deciphering Program Data, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Deciphering Program Data, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

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Check out the MCQs below to embark on an enriching journey through Deciphering Program Data. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

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Deciphering Program Data MCQs | Page 10 of 11

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Q91.
How is a plain-vanilla class with no inheritance implemented in assembly language?

a.

As a data structure with associated functions

b.

As a set of virtual members

c.

As a collection of methods

d.

As a hierarchy of classes

Discuss
Answer: (a).As a data structure with associated functions Explanation:A plain-vanilla class with no inheritance is essentially a data structure with associated functions.
Q92.
What is inheritance in object-oriented programming?

a.

A feature that allows for the creation of a generic base class with multiple descendants.

b.

A feature that allows for accessing data members of a class.

c.

A feature that allows for calling member functions of a class.

d.

A feature that allows for the creation of multiple instances of a class.

Discuss
Answer: (a).A feature that allows for the creation of a generic base class with multiple descendants. Explanation:Inheritance allows for the creation of a generic base class that has multiple descendants, each with different functionality.
Q93.
How does the compiler arrange the classes in memory in an inherited class?

a.

The compiler arranges the classes in memory so that the descendants' data members are first in memory.

b.

The compiler arranges the classes in memory so that the base class's data members are first in memory.

c.

The compiler arranges the classes in memory randomly.

d.

The compiler doesn't arrange the classes in memory.

Discuss
Answer: (b).The compiler arranges the classes in memory so that the base class's data members are first in memory. Explanation:The compiler arranges the classes in memory so that the base class's (the topmost ancestor) data members are first in memory, followed by the next ancestor, and so on and so forth.
Q94.
Why is the layout of an inherited class in memory important?

a.

It guarantees backward-compatibility with code that is not familiar with the specific class that was instantiated but only with some of the base classes it inherits from.

b.

It makes the code run faster.

c.

It allows for easy access to data members of the class.

d.

It is not important.

Discuss
Answer: (a).It guarantees backward-compatibility with code that is not familiar with the specific class that was instantiated but only with some of the base classes it inherits from. Explanation:The layout is necessary in order to guarantee "backward-compatibility" with code that is not familiar with the specific class that was instantiated but only with some of the base classes it inherits from.
Q95.
What are class methods?

a.

Logical constructs that contain a combination of data and of code that operates on that data

b.

Simple functions that are used in object-oriented programming

c.

Logical constructs that contain only data

d.

None of the above

Discuss
Answer: (b).Simple functions that are used in object-oriented programming Explanation:Class methods are essentially just simple functions.
Q96.
What is the purpose of the this pointer?

a.

To point to the location of the first object in memory

b.

To pass the address of a function

c.

To pass the address of an instance of the class

d.

To point to the last object in memory

Discuss
Answer: (c).To pass the address of an instance of the class Explanation:The this pointer is used to pass the address of an instance of the class to the member function.
Q97.
How do some compilers such as G++ pass the this pointer to a nonvirtual member function?

a.

They use the ECX register

b.

They push it into the stack as the first parameter

c.

They do not pass it at all

d.

None of the above

Discuss
Answer: (b).They push it into the stack as the first parameter Explanation:Some compilers such as G++ push the this pointer into the stack as the first parameter.
Q98.
What should you check to confirm that a class method call is a regular, nonvirtual call?

a.

That the function's address is embedded into the code

b.

That it is obtained through a function table

c.

That the function is called using the ECX register

d.

None of the above

Discuss
Answer: (a).That the function's address is embedded into the code Explanation:To confirm that a class method call is a regular, nonvirtual call, you should check that the function's address is embedded into the code and that it is not obtained through a function table.
Q99.
What is the idea behind virtual functions?

a.

To allow a program to utilize an object's services without knowing which particular object type it is using.

b.

To make sure the compiler knows which specific descendant of a class will be passed to a function.

c.

To place all virtual functions in the .rdata section in the executable image.

d.

To hard-code pointers to all virtual function implementations within a specific class.

Discuss
Answer: (a).To allow a program to utilize an object's services without knowing which particular object type it is using. Explanation:The idea behind virtual functions is to allow a program to utilize an object’s services without knowing which particular object type it is using.
Q100.
Are virtual function calls runtime features or compile-time features?

a.

Runtime features

b.

Compile-time features

c.

Both runtime and compile-time features

d.

Neither runtime nor compile-time features

Discuss
Answer: (a).Runtime features Explanation:The virtual function mechanism is a runtime feature.
Page 10 of 11

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