Syntax doubt, Pl clear

#1

In the solution code, what does this mean( ::B=B ) ??
And I submitted without it and the code still got submitted.
So please tell me the use of this in cp!!

#2

:: is scope resolution operator
in ur case it is used:

To access a global variable when there is a local variable with same name:

int x;  // Global x 
   
int main() 
{ 
  int x = 10; // Local x 
  cout << "Value of global x is " << ::x;             -> 0 
  cout << "\nValue of local x is " << x;            _>10 
  return 0; 
}
#3

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