第三周 项目2-三角形类2

#include <iostream>#include <cmath>using namespace std;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();    double perimeter(void);    double area(void);private:    double a,b,c;};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);    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;}bool Triangle::isTriangle(){    if (a+b>c&&a+c>b&&b+c>a)        return 1;    else        return 0;}double Triangle::perimeter(void){    return a+b+c;}double Triangle::area(void){    double p,S;    p=(a+b+c)/2;    S=sqrt(p*(p-a)*(p-b)*(p-c));    return S;}