巧妙利用键盘控制键来显示日历的方法

void ChangeCursorPosition(int x , int y)
{
    COORD position;
    HANDLE handle;

    position.X = x;
    position.Y = y;

    handle = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleCursorPosition(handle , position);
}

void ChangeTextColor(int first_number , int second_number , int select)
{
    HANDLE handle;
    COORD first_position;

    first_position.X = 0;
    first_position.Y = 0;

    handle = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(handle , BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE);
    SetConsoleCursorPosition(handle , first_position);
    printf("              ");
    if(1 == select)
    {
        SetConsoleCursorPosition(handle , first_position);
        SetConsoleTextAttribute(handle , BACKGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
        printf("%7d" , first_number);
        SetConsoleTextAttribute(handle , FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
        printf("%7d" , second_number);
    }
    else if(2 == select)
    {
        SetConsoleCursorPosition(handle , first_position);
        SetConsoleTextAttribute(handle , FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
        printf("%7d" , first_number);
        SetConsoleTextAttribute(handle , BACKGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
        printf("%7d" , second_number);
    }
    printf("\n");

    SetConsoleTextAttribute(handle , FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
}

int key_move(int *first , int *second)
{
    int answer;
    static int key_select = 1;

    answer = getch();
    if(answer == 0xe0)
    {
        answer = getch();
        switch(answer)
        {
        case 0x48:   //up
            if(key_select == 1)
            {
                (*first)--;
                if((*first) < 1900)
                    (*first) = 1900;
            }
            else if(key_select == 2)
            {
                (*second)--;
                if((*second) <= 0)
                {
                    *second = 12;
                    (*first)--;
                }
            }
            break;

        case 0x50:   //down
            if(key_select == 1)
                (*first)++;
            else if(key_select == 2)
            {
                (*second)++;
                if((*second) > 12)
                {
                    *second = 1;
                    (*first)++;
                }
            }
            break;

        case 0x4B:   //left
            key_select--;
            if(key_select < 1)
                key_select = 1;
            break;

        case 0x4D:   //right
            key_select++;
            if(key_select > 2)
                key_select = 2;
            break;
        }
    }
    else if(answer == 0x1b)
    {
        printf("\n");
        exit(0);
    }

    return key_select;
}

#ifndef DATA_CLASS_H_H_CLASS_DATA
#define DATA_CLASS_H_H_CLASS_DATA

class calendar
{
private:
    int month;
    int year;

public:
    calendar(int month = 0 , int year = 0);

    int all_year_days();
    int all_month_day(int month);
    void show_month_day(int month);

public:
    void set_year(int year);
    void set_month(int month);

    int get_year() const;
    int get_month() const;
};

#endif

#include "data_class.h"
#include <iostream>
using namespace std;

calendar::calendar(int month , int year)
{
    this->month = month ? month : 1;
    this->year = year ? year : 1900;
}

int calendar::get_year() const
{
    return this->year;
}

int calendar::get_month() const
{
    return this->month;
}

void calendar::set_month(int month)
{
    this->month = month;
}

void calendar::set_year(int year)
{
    this->year = year;
}

int calendar::all_year_days()
{
    int leap_number = 0;
    int nonleap_number = 0;

    for(int i = 1900 ; i < this->year ; i++)
    {
        if((i % 4 == 0 && i % 100 != 0 ) || (i % 400 == 0))
        {
            leap_number++;
        }
        else
        {
            nonleap_number++;
        }
    }

    return leap_number * 366 + nonleap_number * 365;
}

int calendar::all_month_day(int month)
{
    int month_day[] = {31 , 28 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31};
    int days = all_year_days();
    
    if((this->year % 4 == 0 && this->year % 100 != 0) || (this->year % 400 == 0))
    {
        month_day[1] = 29;
    }

    for(int i = 0 ; i < month - 1 ; i++)
    {
        days += month_day[i];
    }

    return days;
}

void calendar::show_month_day(int month)
{
    int month_day[] = {31 , 28 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31};
    int days = all_month_day(month);

    if((this->year % 4 == 0 && this->year % 100 != 0) || (this->year % 400 == 0))
    {
        month_day[1] = 29;
    }

    for(int i = 0 ; i <= days % 7 ; i++)
    {
        cout<<"     ";
        cout.width(5);
    }

    for(i = 1 ; i <= month_day[month - 1] ; i++)
    {
        if((i + days % 7) % 7 == 0)
            cout<<endl;

        cout<<i;
        cout.width(5);
    }
    cout<<endl;

}

void screen_clear(void)
{
    int i , j;

    for(i = 0 ; i < 18 ; i++)
    {
        for(j = 0 ; j < 40 ; j++)
        {
            printf(" ");
        }
    }
}

int main(void)
{
    calendar data(3 , 2014);
    int year = 2014;
    int month = 3;
    int key_select;

    printf("%7d%7d" , year , month);
    while(1)
    {
        key_select = key_move(&year , &month);
        ChangeTextColor(year , month , key_select);

        screen_clear();
        ChangeCursorPosition(0 , 1);
        data.set_year(year);
        data.set_month(month);
        data.show_month_day(month);
    }

    return 0;
}