Free Essay

C++ Interview Tips

In: Business and Management

Submitted By punitgarud
Words 794
Pages 4
What is the difference between an object and a class?
->Classes and objects are separate but related concepts. Every object belongs to a class and every class contains one or more related objects.

?A Class is static. All of the attributes of a class are fixed before, during, and after the execution of a program. The attributes of a class don't change.

?The class to which an object belongs is also (usually) static. If a particular object belongs to a certain class at the time that it is created then it almost certainly will still belong to that class right up until the time that it is destroyed.

?An Object on the other hand has a limited lifespan. Objects are created and eventually destroyed.
Also during that lifetime, the attributes of the object may undergo significant change.

class and object for same related methods class is nothing but same related to variable to methods.

eg car is a class

maruti santro bolero this is on object A Class is a template. An object is an instance of class. Every data member of an object contains its own value, where as Class only declares the data members.
-------------------------------------------------------------------------------

What is the difference between class and structure?
->Structure: Initially (in C) a structure was used to bundle different type of data types together to perform a particular functionality. But C++ extended the structure to contain functions also. The major difference is that all declarations inside a structure are by default public.

Class: Class is a successor of Structure. By default all the members inside the class are private.
-------------------------------------------------------------------------------

What is encapsulation?
->Packaging an object?s variables within its methods is called encapsulation. itis protective wrapper which prevents the data from being accessed by the code outside the the wrapper, the cose inside the wrapper can be accessed by a well defined interface

ex: class is a protective wrapper which binds data and methods together,they can be aceesed only though well defined interface(i.e object of that class)
---------------------------------------------------------------------------------

Difference between realloc() and free()?
->The free subroutine frees a block of memory previously allocated by the malloc subroutine.
Undefined results occur if the Pointer parameter is not a valid pointer. If the Pointer parameter is a null value, no action will occur. The realloc subroutine changes the size of the block of memory pointed to by the Pointer parameter to the number of bytes specified by the Size parameter and returns a new pointer to the block. The pointer specified by the Pointer parameter must have been created with the malloc, calloc, or realloc subroutines and not been deallocated with the free or realloc subroutines. Undefined results occur if the Pointer parameter is not a valid pointer.

the realloc() function is used to resize memory. where as free() function is used free the memory which is allocated by malloc(),calloc() functions.
---------------------------------------------------------------------------------

What is namespace?
->Namespaces allow us to group a set of global classes, objects and/or functions under a name. To say it somehow, they serve to split the global scope in sub-scopes known as namespaces.

The form to use namespaces is:

namespace identifier { namespace-body }

Where identifier is any valid identifier and namespace-body is the set of classes, objects and functions that are included within the namespace. For example:

namespace general { int a, b; } In this case, a and b are normal variables integrated within the general namespace. In order to access to these variables from outside the namespace we have to use the scope operator ::. For example, to access the previous variables we would have to put:

general::a general::b

The functionality of namespaces is specially useful in case that there is a possibility that a global object or function can have the same name than another one, causing a redefinition error.
-----------------------------------------------------------------------------------

What do you mean by inline function?
->The idea behind inline functions is to insert the code of a called function at the point where the 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.

Inline functions are like macros in c language. The functions are expanded in the line where it is invoked at the time of compilation. These functions should not include any loops or static members inside it. And also it shouldn?t be a recursive one. Inline functions should return a value .The advantages are to avoid time wastages , stack and registers operations done during function calls and function invokations. Keyword ?inline? should be included in the function definition.

Example: inline int add(int a,int b)
{
return a+b;
}

void main()
{
int x=5; int y=10;
cout

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