In this tutorial we shall see different uses of Scope Resolution Operator
- To access a global variable.
- In case of multiple inheritance.
- To Access class static variables.
- To access static member function
- To define a function outside the class.
1. To access a global variable.
#include <iostream>
using namespace std;
int num = 10;
int main(void)
{
int num = 20;
cout<<"Local num value "<<num<<endl;
cout<<"Global num value "<<::num<<endl;
}
Output:
Local num value 20 Global num value 10
2. In case of multiple inheritance.
#include <iostream>
using namespace std;
class Base
{
public:
int num;
Base()
{
num = 10;
}
};
class Derived : public Base
{
public:
int num;
Derived()
{
num = 20;
}
void display()
{
cout<<"The base class num is "<<Base::num<<endl;
cout<<"The derived class num is "<<Derived::num<<endl;
}
};
int main(void)
{
Derived dObj;
dObj.display();
}
Output:
The base class num is 10 The derived class num is 20
3. To Access class static variables.
#include <iostream>
using namespace std;
class Base
{
public:
static int num;
};
int Base::num = 20;
int main(void)
{
cout<<"The static value is "<<Base::num<<endl;
}
Output:
The static value is 20
4. To access static member function
#include <iostream>
using namespace std;
class Base
{
public:
static void display()
{
cout<<"The display function"<<endl;
}
};
int main(void)
{
Base::display();
}
Output:
The display function
5. To define a function outside the class.
#include <iostream>
using namespace std;
class Base
{
public:
void display();
};
void Base::display()
{
cout<<"In display function"<<endl;
}
int main(void)
{
Base obj;
obj.display();
}
Output:
In display function
