C + +:: domain operator

C + +:: domain operator

Scope: The extent to which variables function in a program
Simple: global scope, local scope, statement scope
Scope Priority: the smaller the scope, the higher the priority
Scope operator:"::"
If you want to use global variables of the same name within the scope of a local variable, you can precede the variable with ":: ","::" called the scope operator.

2. //scope
   
4. #include <iostream>
   
6. using namespace Std;
   
10. int Avar=10; //global variable Avar
    
14. int main()
    
16. {
    
18. int Avar=20; //local variable Avar
    
22. cout<<"Avar is:"<<avar<<endl; //access local variables
    
24. Avar=25; //1 //modify local variables
    
26. cout<<"Avar is:"<<avar<<endl;
    
30. cout<<"Avar is:"<<:: Avar<<endl; //Access global variables
    
32. :: Avar=30; //2 //Modify global variables
    
34. cout<<"Avar is:"<<:: Avar<<endl;
    
38. return 0;
    
40. }

Output

1. Avar is:20
2. Avar is:25
3. Avar is:10
4. Avar is:30

C + +:: domain operator