Question

C++ prgramming - Templates and Static

Create a class called fun.

Add to the class a static integer variable called count.

Add a constructor that has count++;

Add a function getCount() { return count ; }

Instantiate 4 instance of the class.   F1, F2, F3 and F4.

Print out the value of count for each instance.

-Be sure to include a UML​

What do you note about the static variable called count? (Answer the question)

Answer 1

#include <iostream>
using namespace std; // consider removing this line in serious projects

class fun{
   public:
static int count;
fun(); //creating constructor
int getcount(){
    return count;
}
};

int fun::count = 0;
fun::fun () {
cout<<count++<<endl;
}

int main() {
fun f1;
fun f2;
fun f3;
fun f4;
cout<<f1.getcount()<<endl;
cout<<f2.getcount()<<endl;
cout<<f3.getcount()<<endl;
cout<<f4.getcount()<<endl;
   return 0;
   }

----------------------------------------end of program--------------------------------------------

//output

0
1
2
3
4
4
4
4

-----------------------------end of output-----------------------------------------------------------------------

Explaination:

Whenever we create an instance of a class fun(f1,f2,f3,f4), first the constructor of the class is
called which prints the count value: 0,1,2,3 (for four instances of class).
Now, as we call f1.getcount() , it prints increment value of count i.e. 4.
As we call f2.getcount() , it prints value of count i.e. 4.
Same happens for f3 nd f4.

-----------------------------------------------------------end of explaination-----------------------------------------------------------

Uml: class diagram

FUN()
count:int
fun(); getcount():