Question

为什么以下代码

#include <iostream>
using namespace std;

class Polygon {
  protected:
    int width, height;
    Polygon()
    {
             cout<<"Constructor with no arguments\n";
             width = 0;
             height = 0;
    }
    Polygon(int width,int height)
    {
                cout<<"Constructor with 2 arguments\n";
                this->width = width;
                this->height = height;
    }
 };

class Rectangle: public Polygon {
  public:
         Rectangle(int width,int height):Polygon(width,height){}
    int area ()
      { return width * height; }
 };

class Triangle: public Polygon {
  public:
         Trianlge(int width,int height): Polygon(width,height){}
    int area ()
      { return width * height / 2; }
  };

int main () {
  //Rectangle rect(4,4);
  //Triangle trgl(4,4);
  return 0;
}

导致这些错误：

 test.cpp:34:39: error: ISO C++ forbids declaration of ‘Trianlge’ with no type [-fpermissive]
          Trianlge(int width,int height): Polygon(width,height){}
                                       ^
test.cpp: In member function ‘int Triangle::Trianlge(int, int)’:
test.cpp:34:42: error: only constructors take member initializers
          Trianlge(int width,int height): Polygon(width,height){}
                                          ^
test.cpp:34:64: warning: no return statement in function returning non-void [-Wreturn-type]
          Trianlge(int width,int height): Polygon(width,height){}

构造函数的继承存在问题。我想在每次创建一个Rectangle或Triangle时调用Polygon的构造函数。但是，令我感到震惊的是，类Rectangle和Triangle非常相似，我只会为{ {1}}而不是Triangle。你能否解释一下错误的原因以及我该如何解决？

Answer 1

您的Triangle班级

中有拼写错误

Trianlge(int width,int height): Polygon(width,height){}
   ^
   ^

C ++构造函数继承错误

1 个答案: