Question

C++设计一个三角形类triangle,数据成员point p1,point p2,point p3,构造函数，计算周长函数，显示函数。

急求啊啊啊~~~

Answer 1

#include <iostream.h>
#include<math.h>
class Point{

public:

int x, y;
Point(){

x=1;
y=1;
}
Point(int a,int b)
{
x=a;
y=b;
}
};

class Triangle{
private:
Point p1,p2,p3;
double p;
public:
Triangle(){
p1=Point(1,1);
p2=Point(3,1);
p3=Point(2,2);
}
void premeter(){
p=sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y))+sqrt((p1.x-p3.x)*(p1.x-p3.x)+(p1.y-p3.y)*(p1.y-p3.y))+sqrt((p3.x-p2.x)*(p3.x-p2.x)+(p3.y-p2.y)*(p3.y-p2.y));

}
void display(){
cout<<"三角形的周长="<<p<<endl;
}
};

void main(){
Triangle *t= new Triangle();
t->premeter();
t->display();

}