Programming in C++ – codewindow.in

#include 

// Global variable with static storage class (internal linkage)
static int globalVar = 10;

// Function with static local variable
void foo() {
    static int localVar = 0; // This variable retains its value between calls.
    localVar++;
    std::cout << "LocalVar: " << localVar << std::endl;
}

int main() {
    auto int a = 5; // 'auto' storage class (optional, same as 'int a = 5;')

    register int b = 10; // 'register' storage class (compiler may ignore it)

    extern int externVar; // Declaration of an external variable (defined elsewhere)
    std::cout << "ExternVar: " << externVar << std::endl;

    for (int i = 0; i < 5; i++) {
        foo(); // Call the function to see the behavior of static local variable.
    }

    return 0;
}