static keyword in C++

Static keyword can be used in the following situations:
* static global variable
* static function
* static local variable
* static member variable (class variable)
* static method
* static object

```
#include <iostream>
using namespace std;

static int sgv = 1;

static void sf() { 
    static int slv = 2;
    cout << ++slv <<",";
}

class C {
public:
    static int smv;
    static void print() {
        cout << smv << endl;
    }
};  
int C::smv = 1;

int main()
{
    cout << sgv << endl;
    for (int i = 0; i < 5; i++)    
        sf();
    cout << endl;

    {
        C c1, c2;
        cout << c1.smv << ", " << c2.smv << endl;
        static C c3;
        c3.print();
    }
    C::print();
    return 0;
}
```
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