C++学习-运算符重载

来源：互联网发布：刀剑神域小说淘宝编辑：程序博客网时间：2024/06/17 03:26

#include<iostream>using namespace std;//重载函数是类的成员函数 ,形参个数=操作数-1;class Point{public:Point(int x=0, int y=0):x(x), y(y){}//x1.show();   //x 和y  1.2void show(){cout << "x=" << x << endl << "y=" << y << endl;}//重载的过程就是调用函数的的过程//object1+object2;//object1.operator+(object2);//  this->x   a.x//函数返回值  operator+ ：函数名  (参数)Point operator+(const Point &a){Point object;//x1.operator+(x2);//x+a.xobject.x = this->x+a.x;object.y = this->y+a.y;return object;}Point operator-(const Point &a){}protected:int x;int y;};int main(){Point x1(1, 2);Point x2(3, 4);Point x3 = x1 + x2;//对象.函数名(实参)//x1.operator+(x2);   x???x1.show();   //x 和y  1.2return 0;}

//基本数据类型不需要重载运算  //对类来说，重载：实现对象与对象之间的运算#include<iostream>using namespace std;class Age{public://构造函数+初始化参数列表Age(int num = 0, int age = 0) :age(age), num(num){}//友元重载函数的声明：  friend 函数返回值 函数名(参数)// 函数名： operator加上运算符组成函数名//友元重载的参数个数=操作数//双目运算符 friend  Age operator*(const Age &a,const Age &b);friend  Age operator-(const Age &a, const Age &b);//有一些运算符必须使用成员函数的方式friend Age operator-(const Age& a);void show(){cout << "num=:" << num << endl;cout << "age=:" << age << endl;}protected:int num;int age;};Age operator*(const Age &a, const Age &b){//重载函数的函数体，就是用打包，复杂运算符实现Age c;c.num = a.num*b.num;c.age = a.age*b.age;return c;}//友元重载操作数等于参数个数 //单目运算符 Age  operator-(const Age &a){Age b;b.num = -a.num;b.age = -a.age;return b;}//重载可以实现对象和对象之间的运算//对象加对象有什么用？？？//复数  1+2iint main(){Age a;Age b(1, 2);Age c(3, 4);a = b*c;   //a.num=b.num+c.num  a.age=b.age+c.agea.show();Age d = -a;d.show();system("pause");return 0;}

#include<iostream>#include <string>using namespace std;class student{public:student(int age = 0, int num = 0) :age(age), num(num){}//  cout ----ostream  输出流对象 //  cin  ----istream  输入流对象//          operator<<  函数名()friend ostream& operator<<(ostream& out, const student& mystudent);friend istream& operator>>(istream& put,student& mystudent);protected:int age;int num;};//返回值一定是返回引用//<< 连续操作 //cout<<a<<b<<endlostream& operator<<(ostream& out, const student& mystudent){//outout <<"\tnum=:"<< mystudent.num <<"\tage=:"<< mystudent.age << endl;return out;}istream& operator>>(istream &put, student& mystudent){cout << "请输入编号和年龄" << endl;put >> mystudent.num >> mystudent.age;return put;}int main(){student mystudent(16, 1);//cout对象<<自定义对象cout << mystudent;//请输入学生年龄和姓名student mystudent2;cin >> mystudent2;cout << mystudent2;string str("Anonymous");cout << str << endl;system("pause");return 0;}

#include<iostream>#include <string>using namespace std;class student{public:student(int age = 0, int num = 0) :age(age), num(num){}//  cout ----ostream  输出流对象 //  cin  ----istream  输入流对象//          operator<<  函数名()void outPut(ostream &out) //注意函数类型{out << "\tnum=:" << num << "\tage=:" <<age << endl;}void Input(istream &put){cout << "请输入编号和年龄" << endl;put >> num >> age;}friend ostream& operator<<(ostream& out, student& mystudent);friend istream& operator>>(istream& put, student& mystudent);protected:int age;int num;};//返回值一定是返回引用//<< 连续操作 //cout<<a<<b<<endlostream& operator<<(ostream& out, student& mystudent){//outmystudent.outPut(out);return out;}istream& operator>>(istream &put, student& mystudent){mystudent.Input(put);return put;}int main(){student mystudent(16, 1);//cout对象<<自定义对象cout << mystudent;//请输入学生年龄和姓名student mystudent2;cin >> mystudent2;cout << mystudent2;string str("Anonymous");cout << str << endl;system("pause");return 0;}

阅读全文

0 0