第5周项目1（2） 三角形类锥形

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All rights reserced.
文件名称：main.cpp
作者：孙亚茹
完成日期：2016.3.23

问题描述：

#include<iostream>#include<cmath>using namespace std;class triangle{public:    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&&c+b>a)        {            return true;        }        else            return false;}private:double a,b,c;};double triangle::perimeter(){return a+b+c;}double triangle::area(){double n;n=(1.0/2)*(a+b+c);return sqrt(n*(n-a)*(n-b)*(n-c));}int main(){triangle tri1;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;}