обработка ошибок

#include <iostream> 
#include <conio.h> 
#include <math.h> 
using namespace std; 
class Triangle{ 
private:
int side1, side2, side3;
public:
double perimeter, p, square;
Triangle(int t_side1, int t_side2, int t_side3) 
{
    SetSides(t_side1, t_side2, t_side3);
}
void ValidSides(int t_side1, int t_side2, int t_side3)
{
  try
  {
    throw 0;
  }
  catch(int t_side1)
  {
    cout << "Caught exception number:  " << t_side1 << endl;
    return;
  }
  cout << "No exception detected!" << endl;
  return;
}
void SetSides(int t_side1, int t_side2, int t_side3)
{
    side1 = t_side1;
    side2 = t_side2;
    side3 = t_side3;
}
double GetPerimeter(int t_side1, int t_side2, int t_side3)
{ 
perimeter = side1+side2+side3 ; 
p=perimeter/2;
return perimeter; 
} 
double GetArea(int t_side1, int t_side2, int t_side3) 
{ 
square = sqrt(p*(p-side1)*(p-side2)*(p-side3));
return square; 
} 
};
int main() 
{ 
setlocale(0,"");
Triangle t(3,4,5); 
t.ValidSides(3,4,5);
cout << "Периметр треугольника равен: " << t.GetPerimeter(3,4,5); 
cout << endl; 
cout << "Площадь треугольника равна: " << t.GetArea(3,4,5); 
cout << endl;
system("pause");
return 0; 
}

#include <stdexcept>
void SetSides(int t_side1, int t_side2, int t_side3)
{
    if (t_side1 <= 0 || t_side2 <= 0 || t_side3 <= 0)
        throw std::logic_error("Wrong value(s)");
    side1 = t_side1;
    side2 = t_side2;
    side3 = t_side3;
}

int main()
try
{
    bla-bla-bla
}
catch(const std::exception&error)
{
    std::cout<<error.what();
    return 0;
}