language: C++ 4.7.2 (gcc-4.7.2)
date: 483 days 14 hours ago
link:
visibility: public 
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#include <iostream>
#include <cstdarg>
 
using namespace std;
 
 
class AbstractClass{
 
public:
  
  virtual double average(int num, ... ) = 0;
 
 
};
 
 
class ConcreteClass : public AbstractClass{
public:
 
   virtual double average(int num, ... ) 
   {
      va_list arguments;                     // A place to store the list of arguments
      double sum = 0;
    
      va_start ( arguments, num );           // Initializing arguments to store all values after num
      for ( int x = 0; x < num; x++ )        // Loop until all numbers are added
        sum += va_arg ( arguments, double ); // Adds the next value in argument list to sum.
      va_end ( arguments );                  // Cleans up the list
      
      return sum / num;                      // Returns the average
  }
 
 
 
};
 
 
 
int main()
{
    AbstractClass* interface = new ConcreteClass();
    cout << interface->average( 3 , 20 ,30 , 40 );
 
    return 0;
}