jQuery火箭图标返回顶部代码

用成员函数重载运算符：

#include "stdafx.h"
#include<iostream>
using namespace std;
class Complex {
private:
    double real, imag;
public:
    Complex(double r = 0.0, double i = 0.0);
    Complex operator+(Complex c);
    Complex operator-(Complex c);
    void display();
};

Complex::Complex(double r, double i)
{
    real = r;
    imag = i;
}

Complex Complex::operator+(Complex c)
{
    Complex temp;
    temp.real = real + c.real;
    temp.imag = imag + c.imag;
    return temp;
}

Complex Complex::operator-(Complex c)
{
    Complex temp;
    temp.real = real - c.real;
    temp.imag = imag - c.imag;
    return temp;
}

void Complex::display()
{
    char ch;
    ch = (imag < 0) ? ' ' : '+';
    cout << real << ch << imag << "i" << endl;
}

int main()
{
    Complex c1(12.4, 13.3);
    Complex c2(14.4, 26.5);
    Complex c;
    cout << "c1=";
    c1.display();
    cout << "c2=";
    c2.display();
    c = c1 + c2;
    cout << "c1+c2=";
    c.display();
    c = c1 - c2;
    cout << "c1-c2=";
    c.display();
    return 0;
}

用友元函数重载运算符：

#include "stdafx.h"
#include<iostream>
using namespace std;
class Complex {
private:
   double real, imag;
public:
   Complex(double r = 0.0, double i = 0.0);
   friend Complex operator+(Complex c1,Complex c2);
   friend Complex operator-(Complex c1,Complex c2);
void display();
};

Complex::Complex(double r, double i)
{
   real = r;
   imag = i;
}

Complex operator+(Complex c1,Complex c2)
{
   Complex temp;
   temp.real = c1.real + c2.real;
   temp.imag = c1.imag + c2.imag;
   return temp;
}

Complex operator-(Complex c1,Complex c2)
{
   Complex temp;
   temp.real = c1.real - c2.real;
   temp.imag = c1.imag - c2.imag;
   return temp;
}

void Complex::display()
{
   char ch;
   ch = (imag < 0) ? ' ' : '+';
   cout << real << ch << imag << "i" << endl;
}

int main()
{
   Complex c1(12.4, 13.3);
   Complex c2(14.4, 26.5);
   Complex c;
   cout << "c1=";
   c1.display();
   cout << "c2=";
   c2.display();
   c = c1 + c2;
   cout << "c1+c2=";
   c.display();
   c = c1 - c2;
   cout << "c1-c2=";
   c.display();
   return 0;
}

单目运算符重载（自加·自减）

用成员函数重载运算符：

#include "stdafx.h"
#include<iostream>
using namespace std;
class Counter {
private:
   unsigned value;            //unsigned不加类型名时，默认表示无符号整型
public:
   Counter() { value = 0; }
   Counter(int i) { value = i; }
   Counter operator++();
   Counter operator++(int);
   Counter operator--();
   Counter operator--(int);
   void display() { cout << value << endl; }
};

Counter Counter::operator++()
{
   value++;
   return *this;
}

Counter Counter::operator++(int)
{
   Counter temp;
   temp.value = value++;
   return temp;
}

Counter Counter::operator--()
{
   value--;
   return *this;
}

Counter Counter::operator--(int)
{
   Counter temp;
   temp.value = value--;
   return temp;
}

int main()
{
   Counter n(10);
   Counter c;
   c = ++n;
   cout << "前缀++运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   c = n++;
   cout << "后缀++运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   c = --n;
   cout << "前缀--运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   c = n--;
   cout << "后缀--运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   return 0;
}

用友元函数重载运算符：

#include "stdafx.h"
#include<iostream>
using namespace std;
class Counter {
private:
   unsigned value;       //unsigned不加类型名时，默认表示无符号整型
public:
   Counter() { value = 0; }
   Counter(int i) { value = i; }
   friend Counter operator++(Counter&);
   friend Counter operator++(Counter& ,int);
   friend Counter operator--(Counter&);
   friend Counter operator--(Counter& ,int);
   void display() { cout << value << endl; }
};

Counter operator++(Counter& p)
{
   p.value++;
   return p;
}

Counter operator++(Counter& p,int)
{
   Counter temp;
   temp.value = p.value++;
   return temp;
}

Counter operator--(Counter& p)
{
   p.value--;
   return p;
}

Counter operator--(Counter& p ,int)
{
   Counter temp;
   temp.value = p.value--;
   return temp;
}

int main()
{
   Counter n(10);
   Counter c;
   c = ++n;
   cout << "前缀++运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();             //这句话相当于 cout<<"c=";
   c = n++;                                           //c.display();
   cout << "后缀++运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   c = --n;
   cout << "前缀--运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   c = n--;
   cout << "后缀--运算符计算结果:" << endl;
   cout << "n=", n.display();
   cout << "c=", c.display();
   return 0;
}

最后来一组运行结果：