int triangle::maxedge()
{
    m=edge1;
    if(m<edge2)m=edge2;
    if(m<edge3)m=edge3;
    return m ;
}

}
int showedges(const triangle tri)
{
    std::cout<<"邊長為 "<<tri.edge1<<','<<tri.edge2<<','<<tri.edge3<<'\n';
    return 0;
}