Saturday, 26 July 2014

CLass and Object in C++ -3


Private member Function :-

Although it is normal practice to place all the data in a private section and all the function in public section .But some situation may require certain function to be hidden (like private data) fro outside calls. 
So we can make a function private . this private function can't be call directly using . operator .
It can only be called by another function that is a member function of that class.

The array can be used as member variable in class .   

  1. // Private member Function
  2. //array within class
  3. #include<iostream>
  4. using namespace std;
  5. class sum_array{
  6.         private:
  7.                 int ar[5]; //array can be used as member variable
  8.                 void print_sum(void); //private member function
  9.         public:
  10.                 void getdata(void);
  12. };
  13. void sum_array::getdata(){
  14.         cout<<" Input 5 element to sum ";
  15.         for(int i=0;i<5;i++){
  16.                 cin>>ar[i];
  17.         }
  18.         print_sum();
  19. }
  20. void sum_array::print_sum(){
  21.         int sum=0;
  22.         for(int i=0;i<5;i++){
  23.                 sum=sum+ar[i];
  24.         }
  25.         cout<<" Sum :- "<<sum;
  26. }
  27. main(){
  28.         sum_array x;
  29.         x.getdata();
  30.         // x.print_sum() ->> you can't access this using . operator as private
  31. }

private function


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