为了熟练类而写的一个程序

#include<iostream>
using namespace std;

class Date
{
   private:
    int month;
    int day;
    int year;
   public:

       Date(int a,int b,int c)
       {
          setMonth(a );
          setDay(b);
          setYear(c );
       }

       void setMonth(int a)
       {
           if(a>=1&&a<=12)
               month=a;
           else
               month=0;
       }
       void setDay(int b)
       {
           day=b;

       }
       void setYear(int c)
       {
           year=c;
       }
       int getMonth()
       {
           return month;
       }
       int getDay()
       {
           return day;
       }
       int getYear()
       {
           return year;
       }

       void displayDate()
       {
           cout<<"现在的时间是: "<<getMonth()<<"/"<<getDay()<<"/"<<getYear()<<endl;
       }
};
   
    int main()
    {     
        
        int month1,day1,year1;
        cout<<"请输入现在的月份:";
         cin>>month1;
        cout<<endl;
      
    cout<<"请输入现在的日子:";
         cin>>day1;
        cout<<endl;
      

    cout<<"请输入现在的年份:";
         cin>>year1;
        cout<<endl;
       Date nian1(month1,day1,year1);
       nian1. displayDate();
        return 0;
    }