第3周项目3三角形类2的多文件组织形式

#include <iostream>
#include <cmath>
#include "triangle.h"
using namespace std;

int main()
{
Triangle tri1;  //定义三角形类的一个实例（对象）
double x,y,z;
cout<<"请输入三角形的三边：";
cin>>x>>y>>z;
tri1.setA(x);
tri1.setB(y);
tri1.setC(z);   //为三边置初值
if(tri1.isTriangle())
{
cout<<"三条边为："<<tri1.getA()<<','<<tri1.getB()<<','<<tri1.getC()<<endl;
cout<<"三角形的周长为："<< tri1.perimeter()<<'\t'<<"面积为："<< tri1.area()<<endl;
}
else
cout<<"不能构成三角形"<<endl;
return 0;
}

<pre name="code" class="cpp">#ifndef TRIANGLR_H_INCLUDED
#define TRIANGLR_H_INCLUDED
class Triangle
{
public:
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;
}
bool isTriangle();//判断是否构成三角形
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
};

#endif // TRIANGLR_H_INCLUDED

#include <iostream>
#include "triangle.h"
#include <cmath>
using namespace std;
bool Triangle::isTriangle()
{
return (a+b>c&&a+c>b&&b+c>a);
}

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

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

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