Question

write a simple program to demonstrate the use of static type of variables in c++...
use comments to explain plz

Answer 1

Static Variables in Functions:-

#include <iostream>

#include <string>

using namespace std;

void sample()

{

    // static variable

    static int count = 0;

    cout << count << " ";

     

    // value is updated and

    // will be carried to next

    // function calls

    count++;

}

int main()

{

    for (int j=0; j<5; j++)    

sample();

    return 0;

}

OUTPUT:-

0 1 2 3 4 

Static Variables in Class:-

#include<iostream>

using namespace std;

class Sample

{

public:

    static int i;

     

    Sample()

    {

        // Do nothing

    };

};

int Sample::i = 1;

int main()

{

    Sample obj;

    // prints value of i

    cout << obj.i;

}

OUTPUT:-

1

Class objects as static:

#include<iostream>

using namespace std;

class Sample

{

    int r;

    public:

        Sample()

        {

r = 0;

            cout << "Inside Constructor\n";

        }

        ~Sample()

        {

            cout << "Inside Destructor\n";

        }

};

int main()

{

    int y = 0;

    if (y==0)

    {

        Sample obj;

    }

    cout << "End of main\n";

}

OUTPUT:-

Inside Constructor
Inside Destructor
End of main

Static functions in a class

#include<iostream>

using namespace std;

class Sample

{

   public:

     

    // static member function

    static void printMsg()

    {

        cout<<"Welcome to Sample!";

    }

};

// main function

int main()

{

    // invoking a static member function

    Sample::printMsg();

}

OUTPUT:-

Welcome to Sample!