题目一
【问题描述】
利用给定的矩形类，编写长方体类
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| class Rect
{
public:
Rect(float l, float w);
float getArea();
protected:
float mLength;
float mWidth;
};
#include<iostream>
using namespace std;
int main()
{
int j, k, l;
cout << "请输入矩形的长和宽：";
cin >> j >> k;
Rect r1(j, k);
cout <<"矩形的面积为："<< r1.getArea() << endl;
cout << "请输入立方体的高：";
cin >> l;
cubiod c1(j,k,l);
cout <<"立方体体积为："<< c1.getVol() << endl;
cout <<"立方体表面积为："<< c1.Area();
return 0;
}
|
【代码】
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| class Rect
{
public:
Rect(float l, float w);
float getArea();
protected:
float mLength;
float mWidth;
};
class cubiod
{
public:
cubiod(float p, float o,float q );
float getVol();
float Area();
protected:
float mLength;
float mWidth;
float mHeight;
};
Rect::Rect(float l, float w)
{
mLength=l;
mWidth=w;
}
float Rect::getArea(){
return mLength*mWidth;
}
cubiod::cubiod(float p, float o,float q){
mLength=p;
mWidth=o;
mHeight=q;
}
float cubiod::getVol(){
return mLength*mWidth*mHeight;
}
float cubiod::Area(){
return 2*mLength*mWidth+2*mWidth*mHeight+2*mLength*mHeight;
}
#include<iostream>
using namespace std;
int main()
{
int j, k, l;
cout << "请输入矩形的长和宽：";
cin >> j >> k;
Rect r1(j, k);
cout <<"矩形的面积为："<< r1.getArea() << endl;
cout << "请输入立方体的高：";
cin >> l;
cubiod c1(j,k,l);
cout <<"立方体体积为："<< c1.getVol() << endl;
cout <<"立方体表面积为："<< c1.Area();
return 0;
}
|
题目二
【问题描述】
由圆构造圆柱
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| PI=3.14
#include<iostream>
using namespace std;
class Circle
{
public:
Circle(void);
Circle(float r);
float getArea();
float getGirth();
static const float PI ;
protected:
float mR;
};
#include<iostream>
using namespace std;
int main()
{
float t, m;
cout << "请输入圆的半径：";
cin >> t;
Circle c1(t);
cout <<"圆的面积为："<< c1.getArea() << endl;
cout << "请输入圆柱的高：";
cin >> m;
Cylinder c2(t, m);
cout <<"圆柱的表面积为："<< c2.getArea() << endl;
cout <<"圆柱的体积为："<< c2.getVol() << endl;
}
|
【代码】
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|
PI=3.14
#include<iostream>
using namespace std;
class Circle
{
public:
Circle(void);
Circle(float r);
float getArea();
float getGirth();
static const float PI ;
protected:
float mR;
};
const float Circle::PI=3.14;
Circle::Circle(void)
{
mR=0;
}
Circle::Circle(float r):mR(r)
{
}
float Circle::getArea()
{
return PI*mR*mR;
}
float Circle::getGirth()
{
return 2*PI*mR;
}
class Cylinder:public Circle
{
public:
Cylinder(float t,float m):Circle(t)
{
mH=m;
}
float getArea()
{
return Circle::getGirth()*mH+2*Circle::getArea();
}
float getVol()
{
return Circle::getArea()*mH;
}
private:
float mH;
};
#include<iostream>
using namespace std;
int main()
{
float t, m;
cout << "请输入圆的半径：";
cin >> t;
Circle c1(t);
cout <<"圆的面积为："<< c1.getArea() << endl;
cout << "请输入圆柱的高：";
cin >> m;
Cylinder c2(t, m);
cout <<"圆柱的表面积为："<< c2.getArea() << endl;
cout <<"圆柱的体积为："<< c2.getVol() << endl;
}
|
题目三
【问题描述】
按以下提示信息，由基类的设计和测试开始，逐渐地完成各个类的设计，并且完成要求的功能。
①设计一个Point（点）类，包含数据成员x、y（坐标点）。
②以Point为基类，派生出一个Circle（圆）类，增加数据成员r（半径）。
③以Circle类为直接基类，派生出一个Cylinder（圆柱体）类，再增加数据成员h（高）。
请设计出各类中基本的成员函数，包括构造函数、设置数据成员和获取数据成员的函数，以及计算圆的周长和面积、计算圆柱体的表面积和体积的函数，使程序正确运行。
pi=3.1415926
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|
int main()
{
double x,y;
cin>>x>>y;
Point p1(x,y);
p1.SetPoint(x+10,y+5);
cout<<fixed<<setprecision(1);
p1.Show();
Circle c1(p1.GetX(),p1.GetY(),20);
c1.Show();
cout<<"c1的周长是："<<c1.Girth()<<endl;
cout<<"c1的面积是："<<c1.Area()<<endl;
Cylinder cy1;
cy1.SetCylinder(c1,10.5);
cy1.Show();
cout<<"cy1的表面积是："<<cy1.Area()<<endl;
cout<<"cy1的体积是："<<cy1.Volumn()<<endl;
return 0;
}
|
【代码】
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| #include <iostream>
#include <iomanip>
using namespace std;
const double pi=3.1415926;
class Point
{
public:
Point (){};
Point (double a,double b);
~Point();
void SetPoint(double a,double b);
void Show();
double GetX();
double GetY();
protected:
double x,y;
};
Point::~Point()
{}
Point::Point (double a,double b)
{
x=a;
y=b;
}
void Point::SetPoint(double a,double b)
{
x=a;
y=b;
}
void Point::Show(){
cout<<x<<","<<y<<endl;
}
double Point::GetX(){
return x;
}
double Point::GetY(){
return y;
}
class Circle: public Point
{
public :
Circle(){};
Circle(double a,double b,double r);
~Circle();
void Show();
double Area() {return pi*R*R;}
double Girth() {return pi*R*2;}
protected:
double R;
double c;
double d;
};
Circle::~Circle(){}
Circle::Circle(double a,double b,double r)
{
c=a;
d=b;
R=r;
}
void Circle::Show(){
cout<<c<<","<<d<<endl;
cout<<R<<endl;
}
class Cylinder:public Circle
{
public:
Cylinder(){};
Cylinder (double x,double y,double r,double h);
void SetCylinder(Circle a,double h);
double Area() ;
double Volumn();
void Show();
protected:
double height;
double q;
double w;
double e;
Circle m;
};
void Cylinder::Show(){
m.Show();
cout<<endl<<height<<endl;
}
Cylinder::Cylinder(double a,double b,double r,double h)
{
q=a;
w=b;
e=r;
height=h;
}
void Cylinder::SetCylinder(Circle a,double h)
{
height=h;
m=a;
}
double Cylinder::Area()
{
return 2*m.Area()+m.Girth()*height;
}
double Cylinder::Volumn()
{
return m.Area()*height;
}
int main()
{
double x,y;
cin>>x>>y;
Point p1(x,y);
p1.SetPoint(x+10,y+5);
cout<<fixed<<setprecision(1);
p1.Show();
Circle c1(p1.GetX(),p1.GetY(),20);
c1.Show();
cout<<"c1的周长是："<<c1.Girth()<<endl;
cout<<"c1的面积是："<<c1.Area()<<endl;
Cylinder cy1;
cy1.SetCylinder(c1,10.5);
cy1.Show();
cout<<"cy1的表面积是："<<cy1.Area()<<endl;
cout<<"cy1的体积是："<<cy1.Volumn()<<endl;
return 0;
}
|
代码可能略有不足，请大佬多多指教
