C++基础——友元类和友元的关系性质

五十九. 友元类和友元的关系性质

#include 

using namespace std;

class A
{
public:
    A(int a){
        this->a = a;
    }

    void printA(){
        cout<<"a= "<a<b =b;
    }
    void printB(){
        A objA(100);
        cout<b<
友元和友类的重要关系性质
六十. 操作符重载的基本语法
 
#include 

using namespace std;

class Complex
{
public:
    Complex(int a,int b)
    {
        this->a = a;
        this->b = b;
    }

    void printComplex()
    {
        cout<<"("<a<<","<b<<"i)"<a+ another.a, this->b+another.b);
        return temp;
    }

    Complex operator+ (Complex &another) //注意operator与后面的操作符，必须中间没有空格，视operator为一个函数
    {
        Complex temp(this->a+ another.a, this->b+another.b);
        return temp;
    }

private:
    int a;
    int b;
};

#if 0
Complex complexAdd(Complex &c1,Complex &c2)
{
    Complex temp(c1.a+c2.a,c1.b+c2.b);
    return temp;
}
#endif

#if 0
//操作符重载写在全局
Complex operator+ (Complex &c1, Complex &c2) //注意operator与后面的操作符，必须中间没有空格，视operator为一个函数
{
    Complex temp(c1.a+ c2.a, c1.b+c2.b);
    return temp;
}
#endif


int main()
{
    Complex c1(1,2);
    Complex c2(2,4);

    c1.printComplex();
    c2.printComplex();

    //Complex c3=complexAdd(c1,c2);
    //Complex c3= c1+c2; //操作符重载写在全局，调用方法1
    //Complex c3 = operator+(c1,c2); //操作符重载写在全局，调用方法2

    //Complex c3= c1+c2; //操作符重载写在类中，调用方法1
    Complex c3= c1.operator+(c2); //操作符重载写在类中，调用方法2


    c3.printComplex();
    return 0;
}
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