DevCpp Help

I'm learning C++ at school on BC++. At home I use Dev C++ which is a little different from BC++. For example I have to add "using namespace std;" to use cout, cin etc.

Code:

---

#include <fstream>
int main()
{
    ifstream Fin("num.in");
    ofstream Fout("num.out");
    int n,x,i;
    i<=1;
    Fin>>n;
    while(i<=n)
    {
              Fin>>x;
              if(x>0) Fout<<x<<" ";
              i=i+1;
              }
              Fin.close();
              Fout.close();
              return 0;
              }

---

This code works on BC++. It's suppose to get the positive numbers from those that we have. What do I have to add to make it work on Dev? I searched on Google, but I didn't find anythingthat could help me, and I don't really know what to search.

> For example I have to add "using namespace std;" to use cout, cin etc.
Does your BC++ compiler not accept this or something? If it doesn't, then consider getting a better compiler which does.

Besides, using namespace std; is poor style as you get EVERYTHING in the standard namespace, not just the things you need (it's a bit like using globals - sure it works, but it ain't pretty).
Use things like
std::cout << "hello world" << std::endl;


> What do I have to add to make it work on Dev?
Depends on what you mean.
Does it compile?
Does it run?
Does it produce the same results?

> i<=1;
Erm, what's this supposed to do?
Compare i (which is uninitialised) with 1, and throw the result of the comparison away.
Try i = 1;
if you want consistency.

> At home I use Dev C++ which is a little different from BC++
Being able to write code which works on any compiler should be the aim of every programmer.

It's a lot harder to do that than just figuring out what your current compiler will let you get away with, but it will serve you well in the long run.

Quote:

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Originally Posted by Sessaru

For example I have to add "using namespace std;" to use cout, cin etc.

---

That would help here as well.
All the standard library functions live in namespace std.
Kurt

I get the following errors:
3: error: expected init-declarator before "using"
3 error: expected `,' or `;' before "using"
4: error: expected unqualified-id before '{' token
4: error: expected `,' or `;' before '{' token

Where did you put your using statement?
like this:

Code:

---

#include <fstream>
using namespace std;
int main()
{
        ifstream Fin("num.in");
        ofstream Fout("num.out");
        int n,x,i;
        i=0;
        Fin>>n;
        while(i<n)
        {
                Fin>>x;
                if(x>0) Fout<<x<<" ";
                i=i+1;
        }
        Fin.close();
        Fout.close();
        return 0;
}

---

?

If you get the code to work, do what Salem suggested and stay away from using namespace std and prefix each object with the std:: qualifier.

try converting 'Fin' with cin... try converting thw whole program into real c++ program...