#include<iostream>#include<cmath>using namespace std;class Triangle{private:double a,b,c;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();double area();};bool Triangle::isTriangle(){return (a+b>c&&a+c>b&&c+b>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));}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;}elsecout<<"不能构成三角形"<<endl;return 0;}
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