第5周项目1-(5)

Copyright (c) 2016,
All rights reserced.
文件名称： main.cpp
作者 ：李鑫

完成日期：2016.4.6

问题描述：使用复制构造函数，能用一个已有的三角形对象，复制出新的三角形对象

#include<iostream>
#include<Cmath>
using namespace std;
class Triangle
{
public:
    Triangle(double x=1, double y=1, double z=1);
    Triangle(const Triangle &t);
    double perimeter();
    double area();
    void showMessage();
private:
    double a,b,c;
};

Triangle::Triangle(double x, double y, double z)
{
    a=x;
    b=y;
    c=z;
}

Triangle::Triangle(const Triangle &t)
{
    a=t.a;
    b=t.b;
    c=t.c;
}

double Triangle::perimeter()
{
    return (a + b + c);
}

double Triangle::area()
{
    double s = (a + b + c) / 2;
    return sqrt(s * (s - a) * (s - b) * (s - c));
}

void Triangle::showMessage()
{
    cout<<"三角形的三边长分别为："<<a<<' '<<b<<' '<<c<<endl;
    cout<<"该三角形的周长为"<<perimeter()<<"，面积为"<<area()<<endl<<endl;
}
int main()
{
    Triangle Tri1(3,4,5);
    Tri1.showMessage();
    Triangle Tri2(Tri1);
    Tri2.showMessage();
    return 0;
}