data10_02.cpp

c++最经典的入门书籍

// Program 10.2 Using a namespace   File: data10_02.cpp
#include <string>
namespace data {
  extern const double pi = 3.14159265;
  extern const std::string days[] = {
                          "Sunday",   "Monday", "Tuesday", "Wednesday",
                          "Thursday", "Friday", "Saturday"
                                    };
}