pr11005.cpp

来自「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」· C++ 代码 · 共 64 行

////////////////////////////////////////
// File Name: pr11005.cpp
////////////////////////////////////////
#include <iostream>
#include <ctime>
#include <stdio.h>

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

public:
    Date(time_t);    // conversion constructor function
    void display();
};

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

// Member function to display the date.
void Date::display()
{
    char year[5];
    if (yr < 10)
        std::sprintf(year, "0%d", yr);
    else
        std::sprintf(year, "%d", yr);

    std::cout << mo << '/' << da << '/' << year;
}

// Constructor conversion function.
Date::Date(time_t now)
{
    std::tm* tim = std::localtime(&now);
    da = tim->tm_mday;
    mo = tim->tm_mon + 1;
    yr = tim->tm_year;
    if (yr >= 100)
        yr -= 100;
}

////////////////////////////////////////
// The main() function.
////////////////////////////////////////
int main()
{
    // Get today's date and time.
    std::time_t now = std::time(0);

    // Construct a Date object by invoking
    // the conversion constructor.
    Date dt(now);

    // Display the date.
    dt.display();

    return 0;
}