第三周项目1——三角形类1

<img src="http://img.blog.csdn.net/20150325083335385?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd3l6OTUwNjIw/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />#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};int main(){    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;} void Triangle::setABC(double x,double y,double z) {     if(x+y>z&&x+z>y&&y+z>x)       {        a=x;        b=y;        c=z;}     else        cout<<"请重新输入:"; } 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 s;     s=a+b+c;     return sqrt(s*(s-a)*(s-b)*(s-c)); }