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; }
本文来自网络收集,不代表计算机技术网立场,如涉及侵权请联系管理员删除。
ctvol管理联系方式QQ:251552304
本文章地址:https://www.ctvol.com/c-cdevelopment/600650.html