What is the declaration method for global variables in C++?
In C++, global variables can be declared at any position outside functions. The declaration of global variables can be divided into two steps.
- Declare the variable outside the function and specify its type and name. For example:
int globalVariable;
- external
extern int globalVariable;
It’s important to note that the definition and declaration of global variables can be done separately. Defining a global variable means allocating memory space for it, while declaring just informs the compiler of its existence. When declaring a global variable, you can define it in another file and then reference it using the extern keyword.
