Endl - Undeclared identifier.

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.

Code:

---

  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.

have u included the

Code:

---

using namespace:: std

---

at the top your code

make sure about this

s.s.harish

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

Code:

---

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

---

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 :)

*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

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

Code:

---

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

---

b.h

Code:

---

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

Code:

---

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

---

b.h

Code:

---

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

---

Everything will be fine, no more name collisions.

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

Quote:

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Originally Posted by InsideTheAsylum

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.

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

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

Code:

---

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

eat::my::shorts();

---