external.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 28 行

#include <iostream>
#include <string>
using namespace std;

string color("red");

void local();

int main()                  
{
    extern string color;           //optional

    cout << "Global color: " << color << endl;

    local();                

    return 0;
}

void local()                // uses local variable
{
    string color("blue");

    cout << "Local color: " << color << endl;

    cout << "Global color: " << ::color << endl;
}