ch19_14.cpp

本文档是C＋＋程序设计教程系列的部分辅助代码。

//***********************
//**    ch19_14.cpp    **
//***********************

#include <iostream.h>
#include <iomanip.h>

class RMB{
public:
  RMB(double v =0.0)
  {
    yuan =v;              //yuan得到v的整数部分
    jf =(v-yuan)*100.0+0.5;
  }
  operator double(){  return yuan+jf/100.0; }
  void display(ostream& out)
  {
    out <<yuan <<'.'<<setfill('0') <<setw(2) <<jf  //如：8分显示08
        <<setfill(' ');
  }
protected:
  unsigned int yuan;
  unsigned int jf;
};

ostream& operator <<(ostream& oo, RMB& d)
{
  d.display(oo);
  return oo;
}

void main()
{
  RMB rmb(1.5);
  cout <<"Initially rmb = " <<rmb <<"\n";
  rmb =2.0*rmb;
  cout <<"then rmb = " <<rmb <<"\n";
}