data10_01.cpp

c++最经典的入门书籍

// File data10_01.cpp
#include <string>
using std::string;

// The next two variables have external linkage
int count;                    // Will be initialized to 0 by default
float phi = 1.618f;           // The divine proportion or golden ratio

// Without the extern, the following would not be accessible
// from another file because they would have internal linkage
extern const double pi = 3.14159265;

extern const string days[] = {
                       "Sunday",   "Monday", "Tuesday", "Wednesday",
                       "Thursday", "Friday", "Saturday"
                             };