// globals.cpp
int globalVar = 42; // Global variable

// main.cpp
#include <iostream>
extern int globalVar; // Declaration for the global variable from another file

void modifyGlobal() {
    globalVar++; // Accessible across files
}

int main() {
    modifyGlobal();
    std::cout << "Global Variable: " << globalVar << std::endl; // Prints: 43
    return 0;
}

#include <iostream>

static int staticVar = 10; // File-scope static

void modifyStatic() {
    staticVar++; // Accessible only within this file
}

int main() {
    modifyStatic();
    std::cout << "Static Variable: " << staticVar << std::endl; // Prints: 11
    return 0;
}

#include <iostream>

void counter() {
    static int count = 0; // Retains value across calls
    count++;
    std::cout << "Count: " << count << std::endl;
}

int main() {
    counter(); // Prints: 1
    counter(); // Prints: 2
    return 0;
}