由C到C++

C风格

#include <iostream>
using namespace std;
struct Date
{
    
    
    int year;
    int month;
    int day;
};
void init(Date &d)
{
    
    
    cout<<"year,month,day:"<<endl;
    cin>>d.year>>d.month>>d.day;
}
void print(Date & d)
{
    
    
    cout<<"year month day"<<endl;
    cout<<d.year<<":"<<d.month<<":"<<d.day<<endl;
}
bool isLeapYear(Date & d)
{
    
    
    if((d.year%4==0&& d.year%100 != 0) || d.year%400 == 0)
        return true;
    else
        return false;
}
int main()
{
    
    
    Date d;
    init(d);
    print(d);
    if(isLeapYear(d))
        cout<<"leap year"<<endl;
    else
        cout<<"not leap year"<<endl;
    return 0;
}

C++

#include <iostream>
using namespace std;
class Date
{
    
    
public:
    void init(Date &d);
    void print(Date & d);
    bool isLeapYear(Date & d);
private:
    int year;
    int month;
    int day;
};
void Date::init(Date &d)
{
    
    
    cout<<"year,month,day:"<<endl;
    cin>>d.year>>d.month>>d.day;
}
void Date::print(Date & d)
{
    
    
    cout<<"year month day"<<endl;
    cout<<d.year<<":"<<d.month<<":"<<d.day<<endl;
}
bool Date::isLeapYear(Date & d)
{
    
    
    if((d.year%4==0&& d.year%100 != 0) || d.year%400 == 0)
        return true;
    else
        return false;
}
int main()
{
    
    
    Date d;
    d.init(d);
    d.print(d);
    if(d.isLeapYear(d))
        cout<<"leap year"<<endl;
    else
        cout<<"not leap year"<<endl;
    return 0;
}

#include <iostream>
using namespace std;
class Date
{
    
    
public:
    void init();
    void print();
    bool isLeapYear();
private:
    int year;
    int month;
    int day;
};
void Date::init()
{
    
    
    cout<<"year,month,day:"<<endl;
    cin>>year>>month>>day;
}
void Date::print()
{
    
    
    cout<<"year month day"<<endl;
    cout<<year<<":"<<month<<":"<<day<<endl;
}
bool Date::isLeapYear()
{
    
    
    if((year%4==0&& year%100 != 0) || year%400 == 0)
        return true;
    else
        return false;
}
int main()
{
    
    
    Date d;
    d.init();
    d.print();
    if(d.isLeapYear())
        cout<<"leap year"<<endl;
    else
        cout<<"not leap year"<<endl;
    return 0;
}