In C++, a global variable is a variable that is declared outside of any function and is accessible throughout the program. Global variables have a global scope and can be accessed by any function within the same file.
To declare a global variable, you need to define it outside of any function. Here’s an example:
#include <iostream>
using namespace std;
int globalVariable = 10;
int main() {
cout << "Global variable value: " << globalVariable << endl;
return 0;
}
In this example, we declare a global variable named globalVariable with an initial value of 10. We can access this variable from within the main function and print its value to the console.
It’s important to note that using global variables can make your code harder to understand and maintain. It’s generally recommended to use local variables whenever possible, as they have a smaller scope and are easier to reason about. However, in certain situations where you need to share data between multiple functions, global variables can be a useful tool.
