C++ code to demonstrate example of static variable inside a function

#include <iostream>

using namespace std;

void f(void)
{
    static int i = 0;
    
    cout << i << endl;
    
    i++;
}


int main()
{
   cout << "Hello World" << endl; 
   
   for (int i = 0; i < 10; i++)
    f();
   
   return 0;
}