第5周项目1（3）三角形类锥形

/*All rights reserced.
文件名称：main.cpp
作者：孙亚茹
完成日期：2016.3.31<p>问题描述：</p><p>*/</p>

#include <iostream>
#include<cmath>
using namespace std;
class Triangle
{
public:
    Triangle(double x,double y,double z):a(x),b(y),c(z){};
    void setABC(double x,double y,double z);
    double perimeter();
    double area();
    void showMessage();
    void seta(double x){a=x;}
    void setb(double y){b=y;}
    void setc(double z){c=z;}
    double geta(){return a;}
    double getb(){return b;}
    double getc(){return c;}
    void showmessage();

private:
    double a,b,c;
};

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

double Triangle::area()
{
   double n;

   n=(1.0/2)*(a+b+c);
   return sqrt(n*(n-a)*(n-b)*(n-c));
}
void Triangle::setABC(double x,double y,double z)
{
    a=x;
    b=y;
    c=z;
}
void Triangle::showMessage()
{
    cout <<"三角形的周长为："<<perimeter()<<'\t'<<"面积为："<<area()<< endl;
}
int main()
{
    Triangle tri(7,8,9);
    tri.showMessage();
    return 0;
}