hello.cpp

#include <iostream>
#include <string>

using std::string;

string name = "Alice";

void foo() {
    std::cout << "Hello " << name << std::endl;
}

void bar() {
    std::cout << "Hello " << name << std::endl;
    string name = "Bob";
    std::cout << "Hello " << name << std::endl;
}

int main() {
    foo();
    bar();
    return 0;
}

// Output:
// Hello Alice
// Hello Alice
// Hello Bob