OOAD作业计算圆柱体和三棱柱体的体积

重要的事情最先说，编程序之前先把类图画好

GoupWork_demo.cpp

#include "podetium.h"
int main()
{int num;a:cout << "请选择要进行的类型：" << endl;cout << " 1、计算圆的面积\n 2、计算三角形的面积\n 3、计算圆柱体的体积\n 4、计算三棱柱的体积\n 5、退出" << endl;cin >> num;if (num==1){Src_Circle W_circle;//实例化圆的对象cout << "请输入圆的半径:" << "";cin >> W_circle.Radius;cout << "圆的面积是：" << "";cout << W_circle.getCircleArea(W_circle.Radius);cout << endl;} else{if (num == 2){Src_Triangle W_triange;//实例化三角形的对象cout << "请输入三角形的三条边：" << "";cin >>W_triange.A_side>> W_triange.B_side>>W_triange.C_side;W_triange.Src_judge(W_triange.A_side, W_triange.B_side,W_triange.C_side);cout<<"输出的三角形的面积是："<<W_triange.getTriangleArea(W_triange.A_side, W_triange.B_side, W_triange.C_side)<<endl;//为什么我这个地方的函数没有没有调用} else//程序在这里是对的{if (num == 3){SrcPodetium Src_podetium;Control m_cotrol;cout << "请输入圆柱体底面圆的半径：" << "";cin >> m_cotrol.SrcCir.Radius;cout << "请输入柱体的高：" << "";cin >> Src_podetium.Height;cout << Src_podetium.getVolume(m_cotrol.get_Area(m_cotrol.SrcCir.Radius), Src_podetium.Height) << endl;} else{   if (num == 4){SrcPodetium Src_podetium;Control m_cotrol;cout << "请输入三角形的三条边：" << "";cin >> m_cotrol.SrcTri.A_side>>m_cotrol.SrcTri.B_side>>m_cotrol.SrcTri.C_side;cout << "请输入三棱柱的高：" << "";cin >> Src_podetium.Height;cout << "三棱柱的体积是：" << Src_podetium.getVolume( m_cotrol.get_Area(m_cotrol.SrcTri.A_side,m_cotrol.SrcTri.B_side,m_cotrol.SrcTri.C_side),Src_podetium.Height) << endl;} else{if (num==5){exit(0);} else{cout << "您输入的有误!" << endl;goto a;}}   }}}goto a;system("pause");
}

podetium.h

#include "Control.h"
class SrcPodetium
{public:double Height;double Volume;Control bm;double getVolume(double a,double b){Volume = a*b;return Volume;}
};

Control.h

#include "Circle.h"
#include "Triangle.h"
class Control
{public:Src_Circle SrcCir;//一个是圆,圆是用来计算面积的，我在最后要把他赋值给pdetumAreaSrc_Triangle SrcTri;//一个是三角形double podetum_area;double get_Area(double r){Src_Circle n_SrcCri;//实例化一个圆return n_SrcCri.getCircleArea(r);}double get_Area(double a, double b, double c){Src_Triangle n_SrcTri;//这个地方用到了函数的重载，我实例化了一个三角形n_SrcTri.Src_judge(a, b, c);podetum_area = n_SrcTri.getTriangleArea(a, b, c);return podetum_area;}
};

Circle.h

#define PI 3.1415926
class Src_Circle
{public:double Radius;double circle_Area;double getCircleArea(double r){circle_Area = PI*r*r;return circle_Area;//千万注意返回值一定要加括号};
};

Triangle.h

#include <iostream>
#include <cmath>
using namespace std;
class Src_Triangle
{
public:double A_side;double B_side;double C_side;double Area;void Src_judge(double a,double b,double c);//定义了一个bool类型double getTriangleArea(double a, double b, double c);//定义了求解方法
};
void Src_Triangle::Src_judge(double a, double b, double c)
{if ((a+b>=c)&(b+c>=a)&(a+c>=b)){cout << "您输入的三个数值可以构成三角形" << endl;} else{cout << "您输入的三个数值无法构成三角形" << endl;}
}
double Src_Triangle::getTriangleArea(double a, double b, double c)
{double m;m = (a + b + c) / 2;Area = sqrt(m*(m - a)*(m - b)*(m - c));return Area;
};

总结一下，在这次编程当中的调试经验

1、重定义

重定义，就是引用了2次同样的同文件，系统会报错
在这个地方如果包含了#include "Circle.h"的话

系统会进行如下报错：

因为引用了#include podetium.h
而在podetium.h文件中引用了#include.control.h

而在Control.h文件中引用了#include Circle.h

那么Circle.h这个头文件，就会重定义

2、成员函数的调用问题

这个是属于写法上的问题了：
在头文件中：

函数体内部，都是用的变量名称a,b,c
而在demo.cpp当中调用的是：

先实例化对象，赋值给实例化对象的属性，吧这个属性传递到实例化对象的方法当中，来充当形参a。
这样才能完成一个完整的传递参数的过程

3、double和void定义方法时候的差别

double的返回值必须是一个双精度的书，在上面的例子中是return Area，为什么要是一个数，因为我在最后想把这个数传递给另外一个类去做计算
void的返回值不能是return ，可以用cout和cin来这样可以刷刷他的存在感

4、类之间的调用

cout << "三棱柱的体积是：" << Src_podetium.getVolume( m_cotrol.get_Area(m_cotrol.SrcTri.A_side,m_cotrol.SrcTri.B_side,m_cotrol.SrcTri.C_side),Src_podetium.Height) << endl;

程序中的这条语句，是实例化了一个Src_podetium的柱体，这个柱体的方法是getvolum，
getVolume（a,b）函数功能是将a*b乘起来
a是实例化的m_control的getArea()函数，这个函数返回值是一个double类型的数

m_cotrol.SrcTri.A_side

m_cotrol是一个实例化对象，m_cotrol的属性是SrcTri，而SrcTri是一个Src_Trian的实例化对象，调用SrcTri这对象的属性A_side

指向图：

OOAD老师格言：用户改需求是给你面子，说明你的东西东西还是能用
现在用户想要改的需求就是增加求长方形的面积和长方体的体积
demo.cpp

#include "podetium.h"
int main()
{int num;a:cout << "请选择要进行的类型：" << endl;cout << " 1、计算圆的面积\n 2、计算三角形的面积\n 3、计算长方形的面积\n 4、计算圆柱体的体积\n 5、计算三棱柱的体积\n 6、计算长方体的体积\n 7、退出" << endl;//这个地方的原理是什么？cin >> num;if (num==1){Src_Circle W_circle;//实例化圆的对象cout << "请输入圆的半径:" << "";cin >> W_circle.Radius;cout << "圆的面积是：" << "";cout << W_circle.getCircleArea(W_circle.Radius);cout << endl;} else{if (num == 2){Src_Triangle W_triange;//实例化三角形的对象cout << "请输入三角形的三条边：" << "";cin >>W_triange.A_side>> W_triange.B_side>>W_triange.C_side;W_triange.Src_judge(W_triange.A_side, W_triange.B_side,W_triange.C_side);cout<<"输出的三角形的面积是："<<W_triange.getTriangleArea(W_triange.A_side, W_triange.B_side, W_triange.C_side)<<endl;//为什么我这个地方的函数没有没有调用} else//程序在这里是对的{if (num==3){rectangle W_rectangle;cout << "请输入长方形的长和宽：" << "";cin >> W_rectangle.A_side >> W_rectangle.B_side;cout << "输出的长方形的面积是：" << W_rectangle.getRetangle(W_rectangle.A_side, W_rectangle.B_side)<<endl;} else{if (num==4){cylinder W_cylinder;cout << "请输入圆柱体底面圆的半径：" << "";cin >> W_cylinder.Src_nCircle.Radius;cout << "请输入圆柱体的高：" << "";cin >> W_cylinder.Height;W_cylinder.Src_nCircle.circle_Area = W_cylinder.Src_nCircle.getCircleArea(W_cylinder.Src_nCircle.Radius);cout << "输出的圆柱体的体积是" << W_cylinder.getVolume(W_cylinder.Src_nCircle.circle_Area, W_cylinder.Height) << endl;} else{if (num==5){triangle_prism W_triangle_prism;cout << "请输入三棱柱底面三角形的三条边：" << "";cin >> W_triangle_prism.Src_nTriangle.A_side >> W_triangle_prism.Src_nTriangle.B_side >> W_triangle_prism.Src_nTriangle.C_side;W_triangle_prism.Src_nTriangle.Src_judge(W_triangle_prism.Src_nTriangle.A_side, W_triangle_prism.Src_nTriangle.B_side, W_triangle_prism.Src_nTriangle.C_side);cout << "请输入三棱柱的高：" << "";cin >> W_triangle_prism.Height;W_triangle_prism.Src_nTriangle.Area=W_triangle_prism.Src_nTriangle.getTriangleArea(W_triangle_prism.Src_nTriangle.A_side, W_triangle_prism.Src_nTriangle.B_side, W_triangle_prism.Src_nTriangle.C_side);cout << "输出的三棱柱的体积是：" << W_triangle_prism.getVolume(W_triangle_prism.Src_nTriangle.Area, W_triangle_prism.Height)<<endl;} else{if (num==6){cuboid W_cuboid;cout << "请输入长方体底面长方形的长和宽：" << "";cin >> W_cuboid.Src_Retangle.A_side >> W_cuboid.Src_Retangle.B_side;cout << "请输入长方体的高:" << "";cin >> W_cuboid.Height;W_cuboid.Src_Retangle.Area = W_cuboid.Src_Retangle.getRetangle(W_cuboid.Src_Retangle.A_side, W_cuboid.Src_Retangle.B_side);cout << "输出的长方体的体积是：" << W_cuboid.getVolume(W_cuboid.Src_Retangle.Area, W_cuboid.Height)<<endl;} else{if (num==7){exit(0);} else{cout << "您输入的有误!" << endl;goto a;}}}}}}}goto a;system("pause");
}

podetium.h

#include "Circle.h"
#include "Triangle.h"
#include "Rectangle.h"
class Podetium
{public:double Height;double Volume;double getVolume(double a, double b){Volume = a*b;return Volume;}
};
class cuboid :public Podetium
{public: rectangle Src_Retangle;};
class cylinder :public Podetium
{public:Src_Circle Src_nCircle;
};
class triangle_prism :public Podetium
{public:Src_Triangle Src_nTriangle;
};

Rectangle.h

class rectangle
{public:double A_side;double B_side;double Area;double getRetangle(double a, double b){Area = a*b;return Area;}
};

还是老问题重定义了，最后把他们都放在同一类下面就完事了。有进步。
还有就是今天用到了继承，就是在类的后面，冒号：public 类名，就可以了

这次主要用了很多虚函数，纯虚函数，接口类，从堆中实例化对象的知识
demo.cpp


//需要是从堆中实例化对象
//使用继承，构造函数，析构函数，定义虚函数 this指针 对const
#include <iostream>
#include "geometry.h"
static void ShowHelpText();
using namespace std;
int main()
{system("color 5E");a:ShowHelpText();int num = 0;cin >> num;if (num==1){Circle *srcCircle=new Circle();cout << "请输入圆的半径：" << "";cin >> srcCircle->Radius;cout << "输出的圆的面积：" << srcCircle->getArea(srcCircle->Radius) << endl;delete srcCircle;} else{if (num==2){Triangle *srcTriangle = new Triangle();cout << "请输入三角形的三条边：" << "";cin >> srcTriangle->A_side >> srcTriangle->B_side >> srcTriangle->C_side;cout << "输出的三角形的面积是：" << srcTriangle->getArea(srcTriangle->A_side, srcTriangle->B_side, srcTriangle->C_side) << endl;delete srcTriangle;} else{if (num==3){Rectangle *srcRectangle = new Rectangle();cout << "请输入长方形的长和宽：" << "";cin >> srcRectangle->A_side >> srcRectangle->B_side;cout << "输出长方形的面积：" << srcRectangle->getArea(srcRectangle->A_side, srcRectangle->B_side) << endl;delete srcRectangle;} else{if (num==4){podetium *srcpodetium = new podetium();Circle *srcCircle = new Circle();cout << "请输入底面圆的半径：" << "";cin >> srcCircle->Radius;cout << "请输入圆柱体的高" << "";cin >> srcpodetium->Height;cout << "输出的圆柱体的体积：" << srcpodetium->getVolume(srcCircle->getArea(srcCircle->Radius), srcpodetium->Height) << endl;delete srcCircle;delete srcpodetium;} else{if (num==5){podetium *srcpodetium = new podetium();Triangle *srcTriangle = new Triangle();cout << "请输入底面三角形的三条边：" << "";cin >> srcTriangle->A_side >> srcTriangle->B_side >> srcTriangle->C_side;cout << "请输入三棱柱三条高：" << "";cin >> srcpodetium->Height;cout << "输出三棱柱的体积是：" << srcpodetium->getVolume(srcTriangle->getArea(srcTriangle->A_side, srcTriangle->B_side, srcTriangle->C_side), srcpodetium->Height) << endl;delete srcTriangle;delete srcpodetium;} else{if (num==6){podetium *srcpodetium = new podetium();Rectangle *srcRectangle = new Rectangle();cout << "请输入底面长方形长和宽：" << "";cin >> srcRectangle->A_side >> srcRectangle->B_side;cout << "请输入长方体的高：" << "";cin >> srcpodetium->Height;cout << "输出的长方体的体积：" << srcpodetium->getVolume(srcRectangle->getArea(srcRectangle->A_side, srcRectangle->B_side), srcpodetium->Height) << endl;delete srcRectangle;delete srcpodetium;} else{if (num==7){podetium *srcpodetium = new podetium();Circle *srcCircle = new Circle();cout << "输入底面圆的半径：" << "";cin >> srcCircle->Radius;cout << "输入圆柱体的高：" << "";cin >> srcpodetium->Height;cout << "输出圆柱体的表面积：" << srcpodetium->getSuperficialArea(srcCircle->getArea(srcCircle->Radius),srcCircle->getPerimeter(srcCircle->Radius), srcpodetium->Height) << endl;delete srcCircle;delete srcpodetium;} else{if (num==8){podetium *srcpodetium = new podetium();Triangle *srcTriangle = new Triangle();cout << "输入底面三角形的三条边：" << "";cin >> srcTriangle->A_side >> srcTriangle->B_side >> srcTriangle->C_side;cout << "输入三棱柱的高：" << "";cin >> srcpodetium->Height;cout << "输出三棱柱的表面积" << srcpodetium->getSuperficialArea(srcTriangle->getArea(srcTriangle->A_side, srcTriangle->B_side, srcTriangle->C_side), srcTriangle->getPerimeter(srcTriangle->A_side, srcTriangle->B_side, srcTriangle->C_side), srcpodetium->Height) << endl;delete srcTriangle;delete srcpodetium;} else{if (num==9){podetium *srcpodetium = new podetium();Rectangle *srcRectangle = new Rectangle();cout << "输入底面长方形的长和宽：" << "";cin >> srcRectangle->A_side >> srcRectangle->B_side;cout << "输入长方体的高：" << "";cin >> srcpodetium->Height;cout << "输出的长方体的表面积：" << srcpodetium->getSuperficialArea(srcRectangle->getArea(srcRectangle->A_side, srcRectangle->B_side), srcRectangle->getPerimeter(srcRectangle->A_side, srcRectangle->B_side), srcpodetium->Height) << endl;delete srcRectangle;delete srcpodetium;} else{if (num==10){exit(0);} else{cout << "Wrong!!!" << endl;goto a;}}}}}}}}}}goto a;system("pause");
}static void ShowHelpText()
{cout << "请选择要进行的类型：" << endl;cout << " 1、计算圆的面积\n 2、计算长方形的面积\n 3、计算三角形的面积\n 4、计算圆柱体的体积\n 5、计算长方体的体积\n 6、计算三棱柱的体积\n 7、计算圆柱体的表面积\n 8、计算长方体的表面积\n 9、计算三棱柱的表面积\n 10、退出\n" << endl;
}

gemoetry.h

#define PI 3.1415926
#include <math.h>
//接口类就是仅含有虚构函数的类
//抽象类就是不允许进行实例化class geometry{public:virtual double  getArea(double a,double b,double c)=0;virtual double  getPerimeter(double a,double b,double c)=0;//表示纯虚函数};
//定义圆的部分
class Circle :public geometry//Circle 这个类继承自 geometry
{
public:double Radius;double getArea(double Radius,double b=0,double c=0);double getPerimeter(double Radius,double b=0,double c=0);
};
double Circle::getArea(double Radius, double b , double c ){this->Radius = Radius;return PI*Radius*Radius;
}
double Circle::getPerimeter(double Radius, double b , double ){this->Radius = Radius;return 2 * PI*Radius;
}
class Triangle: public geometry {
public :double A_side;double B_side;double C_side;double getArea(double A_side, double B_side, double C_side){this->A_side = A_side; this->B_side = B_side; this->C_side;double m;m = (A_side + B_side + C_side) / 2;return sqrt(m*(m - A_side)*(m - B_side)*(m - C_side));}double getPerimeter(double A_side, double B_side, double C_side){this->A_side = A_side; this->B_side = B_side; this->C_side;return A_side + B_side + C_side;}
};
class Rectangle :public geometry {
public:double A_side;double B_side;double getArea(double A_side, double B_side,double c=0);double getPerimeter(double A_side, double B_side,double c);
};
double Rectangle::getArea(double A_side, double B_side,double c){this->A_side = A_side; this->B_side = B_side;return A_side*B_side;
}
double Rectangle::getPerimeter(double A_side, double B_side,double c=0)
{this->A_side = A_side; this->B_side = B_side;return 2 * (A_side+B_side);
}
class podetium {
public:double Height;double getVolume(double Area, double Height){this->Height = Height;return Area*Height;}double getSuperficialArea(double Area,double Perimeter,double Height){this->Height = Height;return 2 * Area + Perimeter*Height;}
};