Endl - Undeclared identifier.

[MipZhaP]

I have this code, where I use endl to go to a newline. Pretty simple, usually I don't get such an error but suddenly my project has begun to give my an error on every line that i use endl.

  cout << "Mathematical Manager:\n";
  cout << "---------------------\n\n";
  cout << "Select problem type: " << endl;
  cout << "1. Rectangular Triangles" << endl;
  cout << "2. Circle Equation" << endl;
  cout << "3. Quadratic Equation" << endl;

Here's the part of my code where I first got the error(title). Then I tried to change the endl, to \n (as you see in the first two lines), that helped.

What could be wrong? I would like to be able to use endl, because that's what I've always used.

Thx in advance.

[ssharish]

have u included the

using namespace:: std

at the top your code

make sure about this

s.s.harish

[Magos]

Even better, don't defile the global namespace at all:

std::cout << "Blah!" << std::endl;

[MipZhaP]

Well I use a middle between you two.
I write using std::endl;
And yes, that was what I'd sadly forgotten.

Remembered all the others though. :S
Thx for reminding me

[InsideTheAsylum]

*wavies*

Hi, new person here.

I was wondering, could someone explain to me the significance of namespaces? I know when to use them and the like, but I don't understand _why_.

Thanks,
Inside

[Magos]

Assume you have two files, a.h and b.h both developed by different programmers who knows nothing about the other's code:
a.h

const int a = 1;
const int b = 2;
const int c = 3;

b.h

const int c = 1;
const int d = 2;
const int e = 3;

If you include both of these in your code you'll get compiler errors, multiple definitions of c.

Now assume the two programmers used namespaces:

a.h

namespace a
{
  const int a = 1;
  const int b = 2;
  const int c = 3;
}

b.h

namespace b
{
  const int c = 1;
  const int d = 2;
  const int e = 3;
}

Everything will be fine, no more name collisions.

[InsideTheAsylum]

Oooooh..
If I wanted to ... I could define my own namespace "inside" where the operators cout, etc, do different things. Right?

[Xipher]

Oooooh..
If I wanted to ... I could define my own namespace "inside" where the operators cout, etc, do different things. Right?

You can't (shouldn't) make changes inside the std namespace. They are they way they are because they are the standard.

[InsideTheAsylum]

I meant.. naming a namespace inside not make a change "inside" the namespace..

Oi, it's confusing :P. I just use "inside" as my online nickname ;P

[Magos]

You can create whatever namespaces you want. Even nest them:

namespace eat
{
  namespace my
  {
    void shorts();
  }
}

eat::my::shorts();