这是个类和对象

来源：互联网发布：龙城霸业 boss积分数据编辑：程序博客网时间：2024/05/23 07:22

这是个关于类和对象的C++程序，这是我们老师留的作业，我做得不太好，这是老师帮着修改之后的程序。这个程序主要是四个类，点，线，三角形，四边形。可能还有不妥之处还望大家海涵，也希望大神能指点一二。

#include<iostream>

#include<math.h>

using namespace std;

这是程序运行结果：

class point //这是定义点的类

{

private:

int x;

inty;

public:

point() //构造函数

{}

voidmove_point()

{

inti,j;

cout<<"输入位移量"<<endl;

cin>>i>>j;

x=i+x;

y=j+y;

}

void set_point()

{

cin>>x>>y;

}

void show()

{

cout<<"横坐标:"<<x<<" "<<"纵坐标"<<y<<endl;

}

int getx()

{

return x;

}

int gety()

{

return y;

}

void distance()

{

float s;

s=sqrt(x*x+y*y);

cout<<"点到原点的距离"<<s<<endl;

}

};

这是点类运行结果：

class line //这是定义线的类

{

private:

point a1;

point a2;

public:

line()

{}

voidset_line()

{

cout<<"输入二个点"<<endl;

a1.set_point();

a2.set_point();

}

voiddislinepoint(point &a3)

{

floatb,k,d;

k=(a2.gety()-a1.gety())/(float)(a2.getx()-a1.getx());

b= a1.gety() - k*a1.getx();

d= fabs(k*a3.getx()-a3.gety()+b)/sqrt(k*k+1);

cout<<"点到直线的距离："<<d<<endl;

}

voidlineshow()

{

floatk, b;

k=(a2.gety()-a1.gety())/((a2.getx()-a1.getx())*1.0);

cout<<"斜率为："<<endl;

cout<<k<<endl;

b= a1.gety() - k*a1.getx();

cout<<"截距为："<<endl;

cout<<b<<endl;

}

};

这是线类运行结果：

class triangle //这是定义三角形的类

{

private:

point a1;

pointa2;

pointa3;

public:

triangle()

{}

void set_triangle()

{

cout<<"输入三个点"<<endl;

a1.set_point();

a2.set_point();

a3.set_point();

}

void show_triangle()

{

judge_triangle();

}

void judge_triangle()

{

float a,b,c,d,s;

a=sqrt((a1.getx()-a2.getx())*(a1.getx()-a2.getx())+(a1.gety()-a2.gety())*(a1.gety()-a2.gety()));

b=sqrt((a2.getx()-a3.getx())*(a2.getx()-a3.getx())+(a2.gety()-a3.gety())*(a2.gety()-a3.gety()));

c=sqrt((a1.getx()-a3.getx())*(a1.getx()-a3.getx())+(a1.gety()-a3.gety())*(a1.gety()-a3.gety()));

if(((a>b-c)&&(a<b+c)) &&((b>a-c)&&(b<a+c)) && ((c>b-a)&&(c<b+a)))

{

cout<<"可以构成三角形"<<endl;

}

else

cout<<"不可以构成三角形"<<endl;

if((a==b)&&(b==c)&&(c==a))

{

cout<<"可以构成等边三角形"<<endl;

}

else

cout<<"不可以构成对等边三角形"<<endl;

if((a==b)||(b==c)||(c==a))

{

cout<<"可以构成等腰三角形"<<endl;

}

else

cout<<"不可以构成对等腰三角形"<<endl;

if(((a*a-b*b-c*c)>-0.01)&&((a*a-b*b-c*c)<0.01)||((b*b-a*a-c*c)>-0.01)&&((b*b-a*a-c*c)<0.01)||((c*c-a*a-b*b)>-0.01)&&((c*c-a*a-b*b)<0.01))

cout<<"可以构成直角三角形"<<endl;

else

cout<<"不可以构成直角三角形"<<endl;

d=(a+b+c)*1/2.0;

s=sqrt(d*(d-a)*(d-b)*(d-c));

cout<<"三角形的面积"<<s<<endl;

}

};

这是三角形运行结果：

class polyangle //这是定义四边形的类

{

private:

point A;

point B;

point C;

point D;

public:

polyangle()

{}

void set_polyangle()

{

cout<<"输入四个点"<<endl;

A.set_point();

B.set_point();

C.set_point();

D.set_point();

}

void judge_polyangle()

{

floatk1,k2,k3,k4;

floata,b,c,d;

float e,f;

float s1,s2,s;

float l,i;

k1=(float)(A.gety()-B.gety())/((A.getx()-B.getx()));

k2=(float)(B.gety()-C.gety())/((B.getx()-C.getx()));

k3=(float)(C.gety()-D.gety())/((C.getx()-D.getx()));

k4=(float)(D.gety()-A.gety())/((D.getx()-A.getx()));

a=sqrt((A.getx()-B.getx())*(A.getx()-B.getx())+(A.gety()-B.gety())*(A.gety()-B.gety()));

b=sqrt((B.getx()-C.getx())*(B.getx()-C.getx())+(B.gety()-C.gety())*(B.gety()-C.gety()));

c=sqrt((C.getx()-D.getx())*(C.getx()-D.getx())+(C.gety()-D.gety())*(C.gety()-D.gety()));

d=sqrt((D.getx()-A.getx())*(D.getx()-A.getx())+(D.gety()-A.gety())*(D.gety()-A.gety()));

e=sqrt((C.getx()-A.getx())*(C.getx()-A.getx())+(C.gety()-A.gety())*(C.gety()-A.gety()));

f=sqrt((D.getx()-B.getx())*(D.getx()-B.getx())+(D.gety()-B.gety())*(D.gety()-B.gety()));

if(((d!=b)&&(k4==k2)&&(a==c))||((a!=c)&&(k1==k3)&&(b==d)))

{

cout<<"是等腰梯形"<<endl;

}

else

cout<<"不是等腰梯形"<<endl;

if((k1==k3)&&(a==c))

{

cout<<"是平行四边形"<<endl;

if(a==b==c==d)

cout<<"该四边形为菱形"<<endl;

else

cout<<"该四边形不为菱形"<<endl;;

}

else

{

cout<<"不是平行四边形"<<endl;

}

if((k1==k3)&&(a==c)&&(k1*k2==-1))

{

cout<<"该四边形为矩形"<<endl;

}

else

cout<<"该四边形不为矩形"<<endl;

i=(a+b+e)*(1/2.0);

s1=sqrt(i*(i-a)*(i-b)*(i-e));

i=(d+c+e)*(1/2.0);

s2=sqrt(i*(i-d)*(i-c)*(i-e));

s=s1+s2;

cout<<"面积"<<s<<endl;

l=a+b+c+d;

cout<<"周长"<<l<<endl;

}

};

这是四边形运行结果：

int main()

{

point a;

cout<<"输入一个点"<<endl;

a.set_point();

a.show();

a.distance();

line q;

q.set_line();

q.lineshow();

triangle p;

p.set_triangle();

p.show_triangle();

polyangle s;

s.set_polyangle();

s.judge_polyangle();

｝这是程序运行结果：

0 0