c/c++语言开发共享c++-面向对象：类和对象

类和对象

#define _crt_secure_no_warnings #include <iostream> #include <string.h>    using namespace std;   struct hero {     char name[64];     int sex; };  void printhero(struct hero &h) {     cout << "hero" << endl;      cout << "name = " << h.name << endl;     cout << "sex = " << h.sex << endl; }  class advhero { public://访问控制权限     char name[64];     int sex;      void printhero()     {         cout << "advhero" << endl;         cout << "name = " << name << endl;         cout << "sex = " << sex << endl;     } };   class animal {     //{}以内 叫类的内部， 以外叫类的外部 public:     char kind[64];     char color[64];  //在public下面定义成员变量和函数 是能够在类的内部和外部都可以访问的。     void printanimal()     {         cout << "kind = " << kind << endl;         cout << "color = " << color << endl;     }      void write()     {         cout << kind << "开始鞋子了" << endl;     }     void run()     {         cout << kind << "跑起来了" << endl;     }      // private:     //在private下面定义的成员变量和方法只能够在类的内部访问      };  int main(void) {     hero h;      strcpy(h.name, "gailun");     h.sex = 1;     printhero(h);        advhero advh;     strcpy(advh.name, "chunbro");     advh.sex = 1;      advh.printhero();      cout << "-----------" << endl;     animal dog;      strcpy(dog.kind, "dog");     strcpy(dog.color, "yellow");      animal sheep;      strcpy(sheep.kind, "sheep");     strcpy(sheep.color, "white");            dog.write();     sheep.run();      return 0; } 

类的封装

一个类类的内部，默认的访问控制权限是private

一个结构体默认的访问控制权限的是public

#define _crt_secure_no_warnings #include <iostream>  using namespace std;  struct date {     int year;     int month;     int day; };  void init_date(struct date & d) {     cout << "year, month, day" << endl;     cin >> d.year;     cin >> d.month;     cin >> d.day; }  //打印data的接口 void print_date(struct date &d) {     cout << d.year << "年" << d.month << "月" << d.day << "日" << endl; }  bool is_leap_year(struct date &d) {     if (((d.year % 4 == 0) && (d.year % 100 != 0)) || (d.year % 400 == 0)) {         return true;     }     return false; }  class mydate { public:     //成员方法 成员函数     void init_date()     {         cout << "year, month, day" << endl;         cin >> year;         cin >> month;         cin >> day;     }      //打印data的接口     void print_date()     {         cout << year << "年" << month << "月" << day << "日" << endl;     }      bool is_leap_year()     {         if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {             return true;         }         return false;     }       int get_year()     {         return year;     }      void set_year(int new_year)     {         year = new_year;     }  protected://保护控制权限。在类的继承中跟private有区别，在单个类中，跟private是一抹一样。 private:     int year;     int month;     int day; };  //一个类类的内部，默认的访问控制权限是private class hero {      int year; };  //一个结构体默认的访问控制权限的是public struct hero2 {     int year;     void print()     {      } };  int main(void) { #if 0     date d1;      init_date(d1);     print_date(d1);     if (is_leap_year(d1) == true) {         cout << "是闰年 " << endl;     }     else {         cout << "不是闰年 " << endl;     } #endif       mydate my_date;      my_date.init_date();      my_date.print_date();      if (my_date.is_leap_year() == true)     {         cout << "是闰年 " << endl;     }     else {         cout << "不是闰年 " << endl;     }      //getter,setter     cout << my_date.get_year() << endl;     my_date.set_year(2000);     cout << my_date.get_year() << endl;      hero h;     //h.year = 1000;      hero2 h2;     h2.year = 100;      return 0; }

面向对象和面向过程

#define _crt_secure_no_warnings #include <iostream>  using namespace std;  class dog { public:     void eat(char *food)     {         cout << name << "³ô" << food << endl;     }      char name[64]; };  //ãæïò¹ý³ì void eat(class dog &dog, char *food) {     cout << dog.name << "³ô" << food << endl; }     int main(void) {     dog dog;      strcpy(dog.name, "¹·");      eat(dog, "ïè");      dog.eat("ïè");        return 0; }