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; }