#include <iostream> #include <cmath> using namespace std; class Triangle { public: float perimeter(void); float area(void); void showMessage(); Triangle(float x,float y,float z):a(x),b(y),c(z){} private: float a,b,c; }; void main() { Triangle Tri1(7,8,9); Tri1.showMessage(); } float Triangle::perimeter(void) { return (a+b+c); } float Triangle::area(void) { float s,m; s=(a+b+c)/2; m=sqrt(s*(s-a)*(s-b)*(s-c)); return m; } void Triangle::showMessage() { cout<<"三角形的三边为: "<<a<<'\t'<<b<<'\t'<<c<<endl; cout<<"该三角形的周长为:"<<perimeter()<<'\t'<<"面积为:"<<area()<<endl; }