sandesh

• Dec 7th, 2005

 

use switch statment !!!

Yashwant Pinge

• Apr 27th, 2006

 

Virtual function:The virtual function is a member function of class which overrides the functionality in a derived classThe virtual function concept is not in a c which is in C++

praveen

• Jan 10th, 2007

 

   
we can implement virtual functions concept  by using function pointers.
if any one have more on this explain about this

dasam

 Profile Answers by dasam 

• Apr 12th, 2007

 

C++ virtual function is a member function of a class, whose functionality can be over-ridden in its derived classes.

Virtual fundtions can be implemented using the keyword 'virtual' in the funtion declaration.

The property of virtual functions in C can be achieved by using function pointers or pointers to function.

satish_sudi

 Profile Answers by satish_sudi 

• Jun 25th, 2007

 

#include <stdio.h>

/* Though this code doesn't reflect exact C++ polymorphism(dynamic),
 i.e. same interface but different inplementation. Tried with different name
*/
void base(int dummy){
  printf("Recieving dummy from base - %d n", dummy);
}

void derive(int dummy){
  printf("Recieving dummy from der - %d n", dummy);
}

int main() {

 int dummy = 100;
 void (*funptr)(int);
 char ch;

 scanf("%c", &ch);
 
 /* Switch case to store the two interfaces address according to the input */
 switch (ch){
 case 'b':
  funptr=&base;
  break;
 case 'd':
  funptr=&derive;
  break;
 }

 /* Function pointer, which, is now, pointing to the function either "base" or "der". */
 
 funptr(dummy);

    return 0;
}

stman

 Profile Answers by stman 

• Jul 11th, 2007

 

In C you would use an array of pointer-to-functions and call the functions by using the array index.

ramyajaya

 Profile Answers by ramyajaya 

• Jun 2nd, 2011

 

virtual functions are used to avoid overriding, when a function in the base class is said as virtual then the same function name when being used in the derived class, even then the function in derived class will be executed, else if the function is not set as virtual the base class function only be executed