[C++] Type Conversion（类型转换）

Type Conversion（类型转换）

Two kinds of type conversion

• explict type conversion(显式类型转换)

• impict type conversion(隐式类型转换)

Two way to  convert type

• 赋值

• 构造函数

• 转换函数

转换函数

不支持friend

类与类转换

 #include <iostream>

 class mianji
 {
 public:
     friend class fushu;
     mianji()
     {
         this->cx = ;
         this->cy = ;
     }
     void setxy(int a,int b)
     {
         this->cx = a;
         this->cy = b;
     }
 protected:
 private:
     int cx;
     int cy;
 };

 class fushu
 {
 public:
     friend class mianji;//ÓÑÔª¿ÉÒÔ·ÃÎÊ˽ÓбäÁ¿
     fushu(mianji mianji1)
     {
         this->x = mianji1.cx;
         this->y = mianji1.cy;
     }
     void print()
     {
         std::cout << x << "+" << y << "i" << std::endl;
     }
     operator mianji()
     {
         mianji temp;
         temp.cx = x;
         temp.cy = y;
         return  temp;
     }

 protected:
 private:
     int x;
     int y;
 };

 void main()
 {
     mianji  mianji1;
     fushu fushu1 =(fushu) mianji1;//通过构造函数转换
     fushu fushu1(mianji1);//通过构造函数转换

     mianji  mianji2;
     mianji2.setxy(, );

     fushu1 = mianji2;//通过构造函数转换
     mianji2 = fushu1;//通过转换函数来转换
     fushu1.print();
     std::cin.get();
 }