pr11010.cpp

c++编程宝典源码及Quincy99编译器 是《标准C++编程宝典》电子工业出版社的光盘

////////////////////////////////////////
// File Name: pr11010.cpp
////////////////////////////////////////
#include <iostream>

////////////////////////////////////////
// The Date class declaration.
////////////////////////////////////////
class Date
{
    int mo, da, yr;

public:
    Date(int m, int d, int y) { mo = m; da = d; yr = y; }
    operator long();    // member conversion function
};

////////////////////////////////////////
// The Date class definition.
////////////////////////////////////////

// The member conversion function.
Date::operator long()
{
    static int dys[]={31,28,31,30,31,30,31,31,30,31,30,31};
    long days = yr;
    days *= 365;
    days += yr / 4;
    for (int i = 0; i < mo-1; i++)
        days += dys[i];
    days += da;

    return days;
}

////////////////////////////////////////
// The main() function.
////////////////////////////////////////
int main()
{
    Date today(2, 12, 90);
    const long ott = 123;
    long sum = ott + today;   // today is converted to long.
    std::cout << ott << " + " << (long) today << " = " << sum;

    return 0;
}