Создать структуру, определяющую треугольник на плоскости

#include <iostream>
#include <math.h>
 
 
struct tochka{
             int x , y ;
};
 
struct TTriangle{
                 tochka t1 , t2 , t3 ;
};
 
TTriangle operator --(TTriangle q){
 q.t1.x-=10;
 q.t2.x-=10;
 q.t3.x-=10;
 return q;
}
 
TTriangle operator ++(TTriangle q){
 q.t1.x+=10;
 q.t2.x+=10;
 q.t3.x+=10;
 return q;
}
 
operator <(TTriangle q1,TTriangle q2){
 double s1,s2,l1,l2,l3,p;
 l1=sqrt((q1.t2.x-q1.t1.x)*(q1.t2.x-q1.t1.x)+(q1.t2.y-q1.t1.y)*(q1.t2.y-q1.t1.y));
 l2=sqrt((q1.t3.x-q1.t1.x)*(q1.t3.x-q1.t1.x)+(q1.t3.y-q1.t1.y)*(q1.t3.y-q1.t1.y));
 l3=sqrt((q1.t3.x-q1.t2.x)*(q1.t3.x-q1.t2.x)+(q1.t3.y-q1.t2.y)*(q1.t3.y-q1.t2.y));
 p=(l1+l2+l3)/2;
 s1=sqrt(p*(p-l1)*(p-l2)*(p-l3));
 l1=sqrt((q2.t2.x-q2.t1.x)*(q2.t2.x-q2.t1.x)+(q2.t2.y-q2.t1.y)*(q2.t2.y-q2.t1.y));
 l2=sqrt((q2.t3.x-q2.t1.x)*(q2.t3.x-q2.t1.x)+(q2.t3.y-q2.t1.y)*(q2.t3.y-q2.t1.y));
 l3=sqrt((q2.t3.x-q2.t2.x)*(q2.t3.x-q2.t2.x)+(q2.t3.y-q2.t2.y)*(q2.t3.y-q2.t2.y));
 p=(l1+l2+l3)/2;
 s2=sqrt(p*(p-l1)*(p-l2)*(p-l3));
 if(s1>s2)cout<<"S TTrianglea 1 > S TTrianglea 2"<<endl;
 else if(s1==s2)cout<<"S TTrianglea 1 = S TTrianglea 2"<<endl;
  else cout<<"S TTrianglea 1 < S TTrianglea 2"<<endl;
}
 
TTriangle input(){
 TTriangle q;
 cout<<"TTriangle:"<<endl<<"   tochka 1:"<<endl<<"      x:";
 cin>>q.t1.x;
 cout<<"     y:";
 cin>>q.t1.y;
 cout<<"   tochka 2:"<<endl<<"     x:";
 cin>>q.t2.x;
 cout<<"     y:";
 cin>>q.t2.y;
 cout<<"   tochka 3:"<<endl<<"     x:";
 cin>>q.t3.x;
 cout<<"     y:";
 cin>>q.t3.y;
 return q;
}
 
void output(TTriangle q){
 cout<<"TTriangle result:"<<endl<<"   tochka 1:"<<endl<<"      x:"<<q.t1.x<<endl<<"     y:"<<q.t1.y<<endl<<"   tochka 2:"<<endl<<"     x:"<<q.t2.x<<endl<<"     y:"<<q.t2.y<<endl<<"   tochka 3:"<<endl<<"     x:"<<q.t3.x<<endl<<"     y:"<<q.t3.y<<endl;
}
 
int main()
{
TTriangle tr1,tr2;
tr1=input();
tr2=input();
tr1<tr2;
tr1=--tr1;
tr2=++tr2;
output(tr1);
output(tr2);
system("pause");
 
        return 0;
}
//---------------------------------------------------------------------------