六周任务4.1

来源：互联网发布：大数据资源共享编辑：程序博客网时间：2024/05/17 03:03

#include <iostream>#include <cmath>using namespace std;class CPoint{private :double x ;double y ;public :CPoint( double xx = 0 , double yy = 0 );//构造函数声明double Distance ( CPoint p ) const ;//求两点距离函数声明void input() ;//按x , y的形式输入点void output() ;//按（x,y)输出点的值};CPoint::CPoint( double xx , double yy ){x = xx ;y = yy ;}void  CPoint::input(){cout << "按 x , y 的形式输入坐标点" << endl ;cin >> x >> y ;}void  CPoint::output(){cout<< "点的坐标为：" <<"("<< x <<","<< y <<")"<< endl ;}double CPoint::Distance ( CPoint p ) const{double h ;h = sqrt ((x - p.x)*(x - p.x) + (y - p.y)*(y - p.y)) ; return h ;}class CTriangle{public:    CTriangle(CPoint &x , CPoint &y , CPoint &z ):A(x),B(y),C(z){}//void setTriangle (CPoint &x , CPoint &y , CPoint &z );//double perimeter(void);//double area(void);//bool isRightTriangle();//bool isIsoscelesTriangle();//private:CPoint A , B , C ;//};/*CTriangle:: CTriangle(){A=x ;B=y ;C=z ;}*/double  CTriangle::perimeter(void){return ( A.Distance(B) + A.Distance(C) + B.Distance(C) ) ;//}void  CTriangle::setTriangle (CPoint &x , CPoint &y , CPoint &z ){A.input();    B.input();C.input();}double  CTriangle::area(void){  double s , m ;m = ( A.Distance(B) + A.Distance(C) + B.Distance(C) )/2 ;s = sqrt ( m * ( m - A.Distance(B) ) * ( m - A.Distance(C) ) * ( m - B.Distance(C) ) ) ;//return s ;}bool  CTriangle::isRightTriangle(){if ( abs(A.Distance(B)*A.Distance(B)+A.Distance(C)*A.Distance(C)-B.Distance(C)*B.Distance(C))<1e-6||abs( A.Distance(B)*A.Distance(B)+B.Distance(C)*B.Distance(C)-A.Distance(C)*A.Distance(C))<1e-6||abs(A.Distance(C)*A.Distance(C)+B.Distance(C)*B.Distance(C)-A.Distance(B)*A.Distance(B))<1e-6) return true ;else return false ;}bool  CTriangle::isIsoscelesTriangle(){if((abs(A.Distance(C)*A.Distance(C)-B.Distance(C)*B.Distance(C))<1e-6)||((abs(A.Distance(B)*A.Distance(B)-B.Distance(C)*B.Distance(C))<1e-6)||(abs(A.Distance(B)*A.Distance(B)-A.Distance(C)*A.Distance(C))<1e-6) ))        return true ;else return false ;}int main(){CTriangle ctr1(CPoint(3,6),CPoint(5,7),CPoint(8,6)) ;//ctr1.setTriangle() ;//cout<<"该三角形的周长为："<<ctr1.perimeter()<<"，面积为："<<ctr1.area()<<endl<<endl;                    cout<<"该三角形"<<(ctr1.isRightTriangle()?"是":"不是")<<"直角三角形"<<endl;                    cout<<"该三角形"<<(ctr1.isIsoscelesTriangle()?"是":"不是")<<"等腰三角形"<<endl;  system ("pause") ;return  0 ;}

运行结果：

感受：最后主函数中的后两个输出还有待掌握，原本想运行时输入三个点，ctr1.setTriangle() 却出现了“参数不能为空的错误”不理解啊。望老师给予宝贵意见，

想在运行时随意输入三个点。呵呵

。谢谢老师啦。呵呵

我要继续加油！！！！！！！！！！