Question

Is there any particular problem in converting these kind of code into VS2010(I have to know before I can check it)

Is there any online VS2010 compiler?

What does assert(false); does?

EXAMPLE

    int applyOperator(Operator op,int x,int y)
{
  switch (op) {
    case operator_plus:  return x+y; // jesli operator_plus zwroc x + y itd.
    case operator_minus: return x-y;
    case operator_mul: return x*y;
    case operator_div: return x/y;
    case operator_none:
      break;
  }
  assert(false);
  return 0;
}

---

#include <iostream>

using namespace std;
#include <iostream>
#include <string>
class Student {
public:
    string Name, ID, Gender, BirthDate, Major;
    friend istream& operator >> (istream& in, Student& s); //DEKLARACJA przeciazenia operatora >> tak bay wczytywal dane linia po linii
    friend ostream& operator<< (ostream&,Student const&);  //DEKLARACJA przeciazenia operatora << tak aby wypisywal obiekty typu Student
};


   istream& operator >> (istream& in, Student& s){
    cout << "Name\n";
    getline (cin,s.Name); //wczytanie linii na imię
    cout <<"ID\n";
    getline (cin,s.ID);   //wczytanie linii na ID
    cout <<"Gender\n";    
    getline (cin,s.Gender);
    cout <<"BirthDate\n";
    getline (cin,s.BirthDate);
    cout <<"Major\n";
    getline (cin,s.Major);
    return in;
    };
ostream& operator<< (ostream &wyjscie, Student const& ex)
{
   wyjscie<<""<<"Name:\t"<<ex.Name<<"\n"<<
    ""<<"Student ID:\t"<<ex.ID<<"\n"<<
    ""<<"Gender:\t"<<ex.Gender<<"\n"<<
    "BirthDate:\t"<<ex.BirthDate<<"\n"<<
    "Major:\t"<<ex.Major<<endl;
    return wyjscie;
}



int main(){
        Student s;
        cin>>s;
        cout<<s;
        return 0;
}

Answer 1

What does assert(false); does?

It opens an assert window. It’s a mechanism to let the programmer know when a control path that wasn’t supposed to be reached, is, or a condition that wasn’t supposed to fail, does.

Basically like:

int divide10ByX(int x)
{
   if ( x == 0 )
   {
      assert(!"x can't be 0");
      return 0;
   }
   return 10/x;
}

When x is 0, the program would normally crash. By checking beforehand, you prevent the crash, but can hide some wrong functionality because x isn’t supposed to be 0. So you put an assert there to inform you whenever x is 0.

Alternitively, it could be assert(x), which only triggers if x==0.