Programming, structures, 17-09-2019

// date.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <iostream>

using namespace std;

struct data1
{
    int day, month, year;
    bool setdate(int d, int m, int y);
    void show();
    void addday(int a);
    void addmonth(int b);
    void addyear(int c);
};
int main()
{
    data1 d;
    if (d.setdate(29, 2, 2012)) d.show();
    int dd, mm, yy;
    cout << "Day="; cin >> dd;
    cout << "Month="; cin >> mm;
    cout << "Year="; cin >> yy;
    if (d.setdate(dd, mm, yy)) d.show();
    d.addday(10); d.show();
    d.addday(100); d.show();
    return 0;
}//end main

void data1::show()
{
    cout << day << "." << month << "." << year << endl;
}
bool vis(int y)
{
    if (y % 4 == 0) return 1;
    else return 0;
}
bool data1::setdate(int d, int m, int y)
{
    int mon[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
    if (y<0) { cout << "ERROR! Year!" << endl; return 0; }
    if (vis(y)) { mon[1] = 29; }
    if (m<0 || m>12) { cout << "ERROR! Month!" << endl; return 0; }
    if (d<0 || d>mon[m - 1]) { cout << "ERROR! Day!" << endl; return 0; }
    day = d; month = m; year = y;
    return 1;
}

void data1::addmonth(int b)
{
    int mon[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };

}

void data1::addyear(int c)
{

}

void data1::addday(int a)
{
    int mon[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
    if (vis(year)) { mon[1] = 29; }
    day += a;
    while (day>mon[month - 1]) {
        day -= mon[month - 1];
        month++;
        if (month>12) {
            month = 1; year++;
            if (vis(year))mon[1] = 29;
            else mon[1] = 28;
        }
    }
}