C++语言基础 例程 类的声明和对象的定义

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类的声明和对象的定义-形式1

#include  <iostream>
#include <cstring>
using namespace std;
class Student
{
private:
    int num;
    char name[20];
    char sex;
public:
    void set_data(int n, char *p,char s)
    {
        num=n;
        strcpy(name,p);
        sex=s;
    }
    void display( )
    {
        cout<<"num: "<<num<<endl;
        cout<<"name: " <<name<<endl;
        cout<<"sex: " <<sex<<endl<<endl;
    }
};
int main()
{
    Student stud1,stud2;
    stud1.set_data(1,"He",'f');
    stud2.set_data(2,"She",'m');
    stud1.display();
    stud2.display();
    return 0;
}

#include <iostream>
#include <cstring>
using namespace std;
class Student
{
public:
    void set_data(int n, char *p,char s);
    void display( );
private:
    int num;
    char name[20];
    char sex;
};
void Student::set_data(int n, char *p,char s)
{
    num=n;
    strcpy(name,p);
    sex=s;
}
void Student::display( )
{
    cout<<"num: "<<num<<endl;
    cout<<"name: " <<name<<endl;
    cout<<"sex: " <<sex<<endl<<endl;
}
int main()
{
    Student stud1,stud2;
    stud1.set_data(1,"He",'f');
    //stud1.sex='m';
    //strcpy(stud1.name,"You");
    stud2.set_data(2,"She",'m');
    stud1.display();
    stud2.display();
    return 0;
}

#include <iostream>
using namespace std;
class Time
{
public:
    void set_time( );
    void show_time( );
private:
    bool is_time(int, int, int);
    int hour;
    int minute;
    int sec;
};

void Time::set_time( )
{
    char c1,c2;
    cout<<"请输入时间(格式hh:mm:ss)";
    while(1)
    {
        cin>>hour>>c1>>minute>>c2>>sec;
        if(c1!=':'||c2!=':')
            cout<<"格式不正确，请重新输入"<<endl;
        else if (!is_time(hour,minute,sec))
            cout<<"时间非法，请重新输入"<<endl;
        else
            break;
    }
}

void Time::show_time( )
{
    cout<<hour<<":"<<minute<<":"<<sec<<endl;
}

bool Time::is_time(int h,int m, int s)
{
    if (h<0 ||h>24 || m<0 ||m>60 || s<0 ||s>60)
        return false;
    return true;
}
int main( )
{
    Time t1;
    t1.set_time( );
    t1.show_time( );
    return 0;
}