项目14-三角形类雏形（3）

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#include <iostream>#include <cmath>using namespace std;class Triangle{public:    Triangle(double x,double y, double z):a(x),b(y),c(z){};    void showMessage();    void setABC(double x,double y,double z);    double perimeter();    double area();    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()    {        if(a+b > c && a+c > b && b+c > a)            return true;        else            return false;    }private:    double a,b,c;};void Triangle::showMessage(){    cout << "三条边为：" << a << "," << b << "," << c << endl;    cout<<"三角形的周长为："<<perimeter()<<'\t'<<"面积为"<<area()<<endl;}void Triangle::setABC(double x,double y,double z){    a=x;    b=y;    c=z;}double Triangle::perimeter(){    return (a+b+c);}double Triangle::area(){    double i;    i=(a+b+c)/2;    return (sqrt(i*(i-a)*(i-b)*(i-c)));}int main(){    Triangle Tri(7,8,9);    Tri.showMessage();    return 0;}

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