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操作符重載指的是將C++提供的操作符進(jìn)行重新定義，使之滿足我們所需要的一些功能。比如類的加減乘除。我們可以定義類中的某一個(gè)成員變量進(jìn)行加減乘除。

在C++中可以重載的操作符有：
+? -? *? /? %? ^? &? |? ~? !? =? <? >? +=? -=? *=? /=? %=? ^=? &=? |=?
<<? >>? <<=? >>=? ==? !=? <=? >=? &&? ||? ++? --? ,? ->*? ->? ()? []?
new? new[]? delete? delete[]

上述操作符中，[]操作符是下標(biāo)操作符，()操作符是函數(shù)調(diào)用操作符。自增自減操作符的前置和后置形式都可以重載。長度運(yùn)算符“sizeof”、條件運(yùn)算符“:?”成員選擇符“.”、對(duì)象選擇符“.*”和域解析操作符“::”不能被重載。

#include <iostream> using namespace std;class complex { public:complex();complex(double a);complex(double a, double b);complex operator+(const complex & A)const;complex operator-(const complex & A)const;complex operator*(const complex & A)const;complex operator/(const complex & A)const;void display()const; private:double real; //復(fù)數(shù)的實(shí)部double imag; //復(fù)數(shù)的虛部 };complex::complex() {real = 0.0;imag = 0.0; }complex::complex(double a) {real = a;imag = 0.0; }complex::complex(double a, double b) {real = a;imag = b; }//打印復(fù)數(shù) void complex::display()const {cout<<real<<" + "<<imag<<" i "; }//重載加法操作符 complex complex::operator+(const complex & A)const {complex B;B.real = real + A.real;B.imag = imag + A.imag;return B; }//重載減法操作符 complex complex::operator-(const complex & A)const {complex B;B.real = real - A.real;B.imag = imag - A.imag;return B; }//重載乘法操作符 complex complex::operator*(const complex & A)const {complex B;B.real = real * A.real - imag * A.imag;B.imag = imag * A.real + real * A.imag;return B; }//重載除法操作符 complex complex::operator/(const complex & A)const {complex B;double square = A.real * A.real + A.imag * A.imag;B.real = (real * A.real + imag * A.imag)/square;B.imag = (imag * A.real - real * A.imag)/square;return B; }int main() {complex c1(4.3, -5.8);complex c2(8.4, 6.7);complex c3;//復(fù)數(shù)的加法c3 = c1 + c2;cout<<"c1 + c2 = ";c3.display();cout<<endl;//復(fù)數(shù)的減法c3 = c1 - c2;cout<<"c1 - c2 = ";c3.display();cout<<endl;//復(fù)數(shù)的乘法c3 = c1 * c2;cout<<"c1 * c2 = ";c3.display();cout<<endl;//復(fù)數(shù)的除法c3 = c1 / c2;cout<<"c1 / c2 = ";c3.display();cout<<endl;return 0; }

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