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What do you mean by pure virtual functions?
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Answer / guest
pure virtual function is one which has no definition but
only declaration. This is defined in base class. The
instance of such base class can not be created
| Is This Answer Correct ? | 24 Yes | 3 No |
Answer / manjusinga
A pure virtual function is a function that must be
overridden in a derived class and need not be defined. A
virtual function is declared to be "pure" using the
curious "=0"
syntax:
class Base {
public:
void f1(); // not virtual
virtual void f2(); // virtual, not pure
virtual void f3() = 0; // pure virtual
};
| Is This Answer Correct ? | 16 Yes | 0 No |
Pure Virtual function is virtual function with expression
equal to zero.
eg
virtual void funct1()=0;
| Is This Answer Correct ? | 4 Yes | 0 No |
A pure virtual function tells the compiler that only
declaration is done here and it guarantees that function
definition will be done in the immediate class where object
is created.
It tells the user what it intended to do and without giving
complete details. And the pure virtual function will not
allow the user to create object and leads to abstract class.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / nk
Any class containing any pure virtual function cannot be
used to create object of its own type.
And any class which is derived by such class must either
define the function or redefine the function.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / mx
May the pure virtual function be called by the function
declared and implemented in the base class?
| Is This Answer Correct ? | 3 Yes | 2 No |
Answer / prabhakar
A VIRTUAL FUNCTION IS IS EQUALL TO ZERO IS CALLLED A PURE VIRTUAL FUNCTION.
FOR EXAMPLE
VIRTUAL FUN()=0;
| Is This Answer Correct ? | 0 Yes | 3 No |
Answer / azra
which is declare only base class.that is called pure virtual function.
| Is This Answer Correct ? | 0 Yes | 3 No |
hi all..i want to know oops concepts clearly can any1 explain??
what is overloading and overriding?
Why is it so that we can have virtual constructors but we cannot have virtual destructors?
#include <iostream> using namespace std; struct wow { int x; }; int main() { wow a; a.x = 22; int c = a.x; int *b = new int; cout << c; return 0; } option: No output 0 22 -(11) Will not compile
what is polymorpsim? what are its types?
What is an object?
What is Iteration Hierarchy? What is what is Object behavioral concept?
Why is polymorphism important in oop?
#include <stdio.h> #include <alloc.h> #include <stdlib.h> #include <conio.h> void insert(struct btreenode **, int); void inorder(struct btreenode *); struct btreenode { struct btreenode *leftchild; struct btreenode *rightchild; int data; }; main() { struct btreenode *bt; bt=(struct btreenode *)NULL; int req,i=1,num; clrscr(); printf("Enter number of nodes"); scanf("%d",&req); while(i<=req) { printf("Enter element"); scanf("%d",&num); insert(&bt,num); i++; } inorder(bt); } void insert(struct btreenode **sr, int num) { if(*sr==NULL) { *sr=(struct btreenode *)malloc (sizeof(struct btreenode)); (*sr)->leftchild=(struct btreenode *)NULL; (*sr)->rightchild=(struct btreenode *)NULL; (*sr)->data=num; return; } else { if(num < (*sr)->data) insert(&(*sr)->leftchild,num); else insert(&(*sr)->rightchild,num); } return; } void inorder(struct btreenode *sr) { if(sr!=(struct btreenode *)NULL) { inorder(sr->leftchild); printf("\n %d",sr->data); inorder(sr->rightchild); } else return; } please Modify the given program and add two methods for post order and pre order traversals.
what is the difference b/w abstract and interface?
2 Answers Merrill Lynch, Schneider, Scio Healthcare,
the difference between new and malloc
When is a memory allocated to a class?
STL 
