#include<iostream>
#include <cmath>
using namespace std;
class Triangle
{public:
void Setabc(double x, double y, double z);//置三边的值,注意要能成三角形
void Getabc(double*x, double*y, double*z);//取三边的值
double Perimeter(void);//计算三角形的周长
double Area(void);//计算并返回三角形的面积
private:
double a,b,c; //三边为私有成员数据
};
void Triangle::Setabc(double x, double y, double z)
{
if((x+y>z)&&(x+z>y)&&(y+z>x))
{
cout<<"能构成三角形。"<<endl;
a=x;
b=y;
c=z;
}
}
void Triangle::Getabc(double*x, double*y, double*z)
{
*x=a;
*y=b;
*z=c;
}
double Triangle::Perimeter(void)
{
return(a+b+c);
}
double Triangle::Area(void)
{
double p=(a+b+c)/2;
double s=sqrt(p*(p-a)*(p-b)*(p-c));
return s;
}
int main(void)
{ Triangle Tri1; //定义三角形类的一个实例(对象)
Tri1.Setabc(4,5,6); //为三边置初值
double x,y,z;
Tri1.Getabc (&x,&y,&z); //将三边的值为x,y,z赋值
cout<<"三条边为:"<<x<<'\t'<<y<<'\t'<<z<<endl;
cout<<"三角形的周长为:"<< Tri1.Perimeter()<<'\t'<<"面积为:"<< Tri1.Area()<<endl;
return 0;
}