Answer / anamika

with help of virtual keyword we can call all the funtion of
same name used in different class by creating pointer of
the base class

Answer / srinivas amdduri

Using Virtual keyword we can override method.otherwise u
can go with sealed class.

Answer / jyoti bajaj

virtual keyword can be used with base classes as well as
with functions.Here we are talking about virtual base
classes.
class A
{
public:
A(){cout<<"it is class A"<<endl;}
};
class B:public A
{
public:
B(){cout<<"it is class B"<<endl;}
};
class C:public A
{
public:
C(){cout<<"it is class C"<<endl;}
};
class D:public B,public C
{
public:
D(){}
};
void main()
{
D obj;
}
output:
it is class A
it is class B
it is class A
it is class C

since class A is constructed twice.but if we want that only
one copy of class A should be shared by both classes A &
B.so we inherit the base class by using virtual keyword.

class A
{
public:
A(){cout<<"it is class A"<<endl;}
};
class B:virtual public A
{
public:
B(){cout<<"it is class B"<<endl;}
};
class C:virtual public A
{
public:
C(){cout<<"it is class C"<<endl;}
};
class D:public B,public C
{
public:
D(){}
};
void main()
{
D obj;
}
output:
it is class A
it is class B
it is class C

Answer / tamil venthan

using virtual we can override the same function for
different sub classes ,By creating the pointer to the base
class we can allocate the separate memory for every
class(memory consumption)not for all classes

Answer / danish afzal

Virtual is important part of polymorphism,and if a function of a base class is virtual we can use or override it in drived classes.

class base
{
virtual void foo() const
{
cout << "danish B";
}
};
class derived1 :public base
{
void foo() const
{
cout << "danish D1";
}

};
class derived2 :public base
{
void foo() const
{
cout << "danish D2";
}

};

Answer / giri

Virtual keywork is important functionality in C++. We used
virtual class/ function to access function run time.
Virtual function is override the same function in derived
classs and can access through run time using Upcasting.

Answer / devi

The Keyword virtual provides a mechanism for defining the
virtual functions.When declaring the base class member
function,the keyword virtual is used with those
functions,which are to be bound dynamically.

Answer / p.madhupriya

virtual keyword we can call all the funtion of
same name used in different class by creating pointer of
the base class

Answer / deepak kumar

using virtual keyword we can change the defination of base
class method via overriding them in derived class.

What is abstraction in oops?

0 Answers  

Write a program to compute for numeric grades for a course. The course records are in a file that will serve as the input file. The input file is in exactly the following format: Each line contains a student's first name, then one space, then ten quiz scores all on one line. The quiz scores are in whole number and are separated by one space. Your program will take it input from this file and sends it output to a second file. The data in the output file will be exactly the same as the data in the input file except that there will be one additional number (of type double) at the end of each line. This number will be the average of the student's ten quiz scores. Use at least one function that has file streams as all or some of its arguments.

0 Answers  

What are the 4 main oop principles?

0 Answers  

can we create and enter the data & hide files using programmes ?

2 Answers   Wipro,

what is the function of 'this' operator ?

7 Answers   Wipro,

What type of loop is a for loop?

0 Answers  

What is difference between pop and oop?

0 Answers  

What is oops with example?

0 Answers  

How Do you Code Composition and Aggregation in C++ ?

3 Answers   IBM, NET,

what is difference between objects and function

3 Answers  

what is Class in oops with example?

4 Answers   HCL,

What is the differances between a abstract calss and interface

5 Answers   Aviva, Symphony,