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pdetumArea        Src_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 3.1415926class 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;    }};