c++从入门到精通——类的设计

类的相同与否设计

#include<iostream>
using namespace std;
class Cube{
public:
  void setL(int l){
    m_L = l;
  }
  void setW(int W){
    m_W = W;
  }
  void setH(int H){
    m_H = H;
  }
  //获取长宽高
  int getL() const
  {
    return m_L;
  }
  int getW() const
  {
    return m_W;
  }
  int getH() const
  {
    return m_H;
  }
  // 求面积
  double calcaulateS() const{
    return 2 * m_L*m_W + 2 * m_W*m_H + 2 * m_L*m_H;
  }
  //求体积
  int calculateV() const
  {
    return m_L * m_W * m_H;
  }

  //利用成员函数 判断立方体是否相等
  bool compareCubeByClass( Cube &c ) const
  {
    return m_L == c.getL() &&  m_W == c.getW() && m_H == c.getH();
  }

private:
  int m_L; //长
  int m_W; //宽
  int m_H; //高

};
bool compareCude(Cube &c1,Cube &c2){
  /*if (c1.getL() == c2.getL() && c1.getW() == c2.getW() && c1.getH() == c2.getH())
  {
  return true;
  }
  return false;*/
  return c1.getL() == c2.getL() && c1.getW() == c2.getW() && c1.getH() == c2.getH();
}
void test01(){
  Cube c1{};
  c1.setL(10);
  c1.setW(10);
  c1.setH(10);
  cout << "c1面积为： " << c1.calcaulateS() << endl; //600
  cout << "c1体积为： " << c1.calculateV() << endl; //1000

  Cube c2{};
  c2.setL(10);
  c2.setW(10);
  c2.setH(10);


  //利用全局函数判断 c1 和 c2是否相等
  bool ret = compareCude(c1, c2);
  if (ret)
  {
    cout << "c1 与 c2 相等" << endl;
  }
  else
  {
    cout << "c1 与 c2 不相等" << endl;
  }


  //利用成员函数 判断  c1 和 c2是否相等
  ret = c1.compareCubeByClass(c2);
  if (ret)
  {
    cout << "成员函数判断：c1 与 c2 相等" << endl;
  }
  else
  {
    cout << "成员函数判断：c1 与 c2 不相等" << endl;
  }
}
int main(){
  test01();
  system("pause");
  return EXIT_SUCCESS;
}

类的点圆案例设计

main.cpp

#include <iostream>
#include "point.h"
#include "circle.h"
//利用全局函数 判断点和圆关系
void isInCircle( Circle c , Point p )
{

  int distance = (c.getCenter().getX() - p.getX())*(c.getCenter().getX() - p.getX()) + (c.getCenter().getY() - p.getY()) *(c.getCenter().getY() - p.getY());

  int rDistance = c.getR() * c.getR();

  if (distance == rDistance)
  {
    cout << "点在圆上" << endl;
  }
  else if (distance > rDistance)
  {
    cout << "点在圆外" << endl;
  }
  else
  {
    cout << "点在圆内" << endl;
  }

}
void test01()
{
  Point p;
  p.setX(10);
  p.setY(9);

  Circle c;
  Point pCenter;
  pCenter.setX(10);
  pCenter.setY(0);
  c.setCenter(pCenter);
  c.setR(10);

  isInCircle(c, p);

  c.isInCircleByClass(p);

}
class A
{
  virtual void func() = 0;
};
class B :public A
{

};
class C :public B
{
};

int main(){

  test01();

  system("pause");
  return EXIT_SUCCESS;
}

circle.h

//
// Created by CWF on 2022/10/5.
//

#ifndef CODE_C___CIRCLE_H
#define CODE_C___CIRCLE_H
#include <iostream>
#include "point.h"
using namespace std;
class Circle{
public:
  void setR(int r);
  int getR()const;
  void setCenter(Point &p);
  Point getCenter() const;
  //判断点和圆关系
  void isInCircleByClass(Point p);

private:
  int m_R{0};
  Point m_Center;
};
void Circle::setR(int r) {
  this->m_R = r;
}
int Circle::getR() const {
  return this->m_R;
}
Point Circle::getCenter() const{
  return this->m_Center;
}
void Circle::setCenter(Point &p) {
  m_Center = p;
}
//判断点和圆关系
void Circle::isInCircleByClass(Point p)
{

  int distance = (m_Center.getX() - p.getX())*(m_Center.getX() - p.getX()) + (m_Center.getY() - p.getY()) *(m_Center.getY() - p.getY());

  int rDistance = m_R * m_R;

  if (distance == rDistance)
  {
    cout << "is" << endl;
  }
  else if (distance > rDistance)
  {
    cout << "out" << endl;
  }
  else
  {
    cout << "in" << endl;
  }
}

#endif //CODE_C___CIRCLE_H

point.h

//
// Created by CWF on 2022/10/5.
//

#ifndef CODE_C___POINT_H
#define CODE_C___POINT_H
#include <iostream>
class  Point{
public:
  void setX(int x){
    this->m_X = x;
  }
  void setY(int y){
    this->m_Y = y;
  };
  int getX() const;
  int getY() const;
private:
  int m_X;
  int m_Y;

};
int Point::getX() const{
  return this->m_X;
}
int Point::getY() const{
  return this->m_Y;
}

#endif //CODE_C___POINT_H