How to Access Global Variable if there is a Local Variable with Same Name in C/ C++?

Local Variable: The variable whose scope lies inside a function or a block in which they are declared. 

Global Variable: The variable that exists outside of all functions. It is the variable that is visible from all other scopes.

We can access global variable if there is a local variable with same name in C and C++ through Extern and Scope resolution operator respectively.

In C:

1) We can access a global variable if we have a local variable with same name in C using extern. 

Value of global x is 50
Value of local x is 10

Time Complexity: O(1)

Auxiliary Space: O(1)

In C++:

2) We can access a global variable if we have a local variable with the same name in C++ using Scope resolution operator (::). 

Value of global x is 50
Value of local x is 10

Time Complexity: O(1)

Auxiliary Space: O(1)