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Functions in C++ Interview Questions & Answers - Learning Mode

Functions in C++ Interview Questions & Answers - Learning Mode

A function is a group of statements that together perform a task. Every C++ program has at least one function, which is main(), and all the most trivial programs can define additional functions. You can divide up your code into separate functions. Functions allow to structure programs in segments of code to perform individual tasks. In C++, a function is a group of statements that is given a name, and which can be called from some point of the program. The most common syntax to define a function is: type name ( parameter1, parameter2, ...) { statements }.

Try Functions in C++ Interview Questions & Answers - Exam Mode

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Functions in C++ Interview Questions & Answers - Learning Mode
Try Functions in C++ Interview Questions & Answers - Exam Mode
Question: What is void main mean?

Answer: main is also a function.Operating system will call this function.void means it returns nothing.when the function completed it task, it just goes out of scope. Source:
Question: How to write a program such that it will delete itself after execution?

Answer: It's protected by system when an EXE is runing, so we can't delete it. But the program can delete itself in an indirect way.
First the program should know whether it is a original one or cloned one:
If it is an original one, it will clone itself to a temp folder and pass the needed parameters to this new one. The new cloned EXE file should be defined as "FILE_FLAG_DELETE_ON_CLOSE". Then the original one ends itself.
If it is an cloned one, it will synchronize original program wi Source:
Question: What do you mean by inline function?

Answer: The idea behind inline functions is to insert the code of a called function at the point where the<br>function is called. If done carefully, this can improve the application's performance in exchange for increased compile time and possibly (but not always) an increase in the size of the generated binary executables. Source:
Question: What do u meant by ?SBI? of an object?

Answer: SBI stands for State, Behavior and Identity. Since every object has the above three.

State: It is just a value to the attribute of an object at a particular time.
Behaviour:It describes the actions and their reactions of that object.Identity:
An object has an identity that characterizes its own existence. The identity makes it possible to distinguish any object in an unambiguous way, and independently from its state. Source:
Question: 1.why the six operators cann't be overloaded?

2.why main() is a userdefined function?

Answer: Compiler are programmed to start with main function so we can start our programming in main function thus it becomes user defined. Source:
Question: What does the keyword virtual mean in the method definition?

Answer: The method can be over-ridden. Source:
Question: I want a program on INLINE function and demonstrate the program with INLINE function and without INLINE function.Because i want to know clearly the difference between INLINE FUNCTION AND FUNCTION

Answer: Inline functions get copied to every locations that make a call to the function. That is the entire function body (all statements) are inlined into source code at every calling location.

Inline functions should only be used if the body of the function is only a few lines of code. Source:
Question: Does Console.WriteLine() stop printing when it reaches a NULL character within a string?

Answer: Strings are not null terminated in the runtime, so embedded nulls are allowed. Console.WriteLine() and all similar methods continue until the end of the string. Source:
Question: What do you mean by inline function?

Answer: Inline Functions are like Normal functions.When an inline Function is invoked the code of function is inserted instead of jump to code of function.

inline keyword is added to the function definition to make that particular function inline function.

inline keyword is just a request to the compiler.Sometimes Compiler will ignore the request and compile the function as normal function.
Question: Can we take "main function" as of type float,char etc?

Answer: Its possible only with int.If a function is declared as void that it may return anything by default. Source:
Question: What is virtual constructors/destructors?

Answer: Answer1
Virtual destructors:
If an object (with a non-virtual destructor) is destroyed explicitly by applying the delete operator to a base-class pointer to the object, the base-class destructor function (matching the pointer type) is called on the object.
There is a simple solution to this problem declare a virtual base-class destructor.
This makes all derived-class destructors virtual even though they don?t have the same name as the base-class destructor. Now, if the object in the Source:
Question: what is abstractor in c++?

Answer: An abstract class is a class that is designed to be specifically used as a base class. An abstract class contains at least one pure virtual function. You declare a pure virtual function by using a pure specifier (= 0) in the declaration of a virtual member function in the class declaration.<br><br>The following is an example of an abstract class:<br><br>class AB {<br>public:<br> virtual void f() = 0;<br>};<br><br>Function AB::f is a pure vir Source:
Question: What is the difference between delete and delete [ ]?

Answer: The keyword delete is used to destroy the single variable memory created dynamically which is pointed by single pointer variable.
Eg: int *r=new(int)
the memory pointed by r can be deleted by delete r.
delete [] is used to destroy array of memory pointed by single pointer variable.
Eg:int *r=new(int a[10])

The memory pointed by r can be deleted by delete []r. Source:
Question: What is public, protected, private?

Answer: ?Public, protected and private are three access specifiers in C++.

?Public data members and member functions are accessible outside the class.

?Protected data members and member functions are only available to derived classes.

?Private data members and member functions can?t be accessed outside the class. However there is an exception can be using friend classes. Source:
Question: What is an explicit constructor?

Answer: A conversion constructor declared with the explicit keyword. The compiler does not use an explicit constructor to implement an implied conversion of types. It?s purpose is reserved explicitly for construction. Source:
Question: What is the difference between Function and Member function?

Answer: A function declared/defined within a class is a member function and a function declared/defined outside the scope of a class is a function. Source:
Question: What is the difference between macro and inline()?

Answer: 1. Inline follows strict parameter type checking, macros do not.<br><br>2. Macros are always expanded by preprocessor, whereas compiler may or may not replace the inline definitions.<br> Source:
Question: Is it possible to know that how much memory used by a member function or constructor?

Answer: memory is used by constructor at the time of instaintiation of the class. If we dont instaintiate or create the object of the class, memory is not used by the constructor.
Memory is consumed by the member function at compile time, in terms of block inside a stack.

Depends upon the number of variables used in function definition. Source:
Question: What is the syntax for calling an overloaded constructor within a constructor (this() and constructorname() does not compile)?

Answer: The syntax for calling another constructor is as follows:
class B
B(int i)
{ }
class C : B
C() : base(5) // call base constructor B(5)
{ }
C(int i) : this() // call C()
{ }
public static void Main() {}
} Source:
Question: Please tell me all about dos.h and all its functions? how are the functions od dos.h are used ?

Answer: It defines structs, unions, macros, and functions for dealing with MSDOS and the Intel iAPX86 microprocessor family.
none of the functions defined in dos.h can be used with any modern 32-bit or newer compiler. You need to use ancient compilers such as Turbo C or Turbo C++.

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