upload

CplusplusPractice/dateclass.cc

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+#include <iostream>
+
+class Date
+{
+    private:
+        int year_, month_, day_;
+
+        int getMonthsMaxDay(int year, int month)
+        {
+            int months[12] = { 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+            if (month == 2)
+            {
+                if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
+                     months[1] = 29;
+                else months[1] = 28;
+            }
+
+            return months[month - 1];
+        }
+
+    public:
+        Date();
+        Date(int year, int month, int day);
+        void addDay(int inc);
+        void addMonth(int inc);
+        void addYear(int inc);
+        void showDate();
+};
+
+Date::Date()
+    : year_(2004), month_(01), day_(01) {}
+
+Date::Date(int year, int month, int day)
+    : year_(year), month_(month), day_(day) {}
+
+void Date::addDay(int inc)
+{
+    day_ += inc;
+
+    for (; day_ > getMonthsMaxDay(year_, month_);)
+    {
+        day_ -= getMonthsMaxDay(year_, month_);
+        addMonth(1);
+    }
+}
+
+void Date::addMonth(int inc)
+{
+    month_ += inc;
+
+    for (; month_ > 12;)
+    {
+        month_ -= 12;
+        addYear(1);
+    }
+}
+
+void Date::addYear(int inc)
+{
+    year_ += inc;
+}
+
+void Date::showDate()
+{
+    if (month_ < 10 && day_ < 10)
+        std::cout << "Now Date() : " << year_ << "-0" << month_ << "-0" << day_ << std::endl;
+    else if (month_ < 10 && day_ > 9)
+        std::cout << "Now Date() : " << year_ << "-0" << month_ << "-" << day_ << std::endl;
+    else if (month_ > 9 && day_ < 10)
+        std::cout << "Now Date() : " << year_ << "-" << month_ << "-0" << day_ << std::endl;
+    else
+        std::cout << "Now Date() : " << year_ << "-" << month_ << "-" << day_ << std::endl;
+}
+
+int main()
+{
+    Date date(2020, 10, 10);
+    date.showDate();
+}