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Practical-8

Write a cpp program for static class member. (Class member should be a static variable)​

Introduction

Code​

Practical-8.cpp
#include <iostream>
// This code creates a class called "Example"
class Example
{
  public:

    // The variable below is a 'static' member variable, which
    // means that every instance of the class 'Example' will have
    // the same value for this variable
    static int count;

    // This is the constructor for the class 'Example' and is
    // it is executed when an instance of 'Example' is created
    Example()
    {
      // Increment the static variable when the constructor is called
      // so that we can track how many instances of 'Example' exist
      count++;
    }
};

// We now need to define the static variable 'count' so that
// it can be accessed outside of the class.
int Example::count = 0;

void main()
{
  // Now we create three new objects of type 'Example'
  Example a;
  Example b;
  Example c;

  // 'count' will be equal to 3, since three instances
  // of 'Example' were created above
  std::cout << "Total Example objects created: " << Example::count << std::endl;

  return 0;
}

Output​

Total Example objects created: 3