Thread: I NEED #define HELP!!!!

Ok. It works perfectly

#include <iostream>
using std::cout;
const int ONE = 1;
const int TWO = 2;

int main()
{

int sum = ONE + TWO;
cout<<"\n\n "<<sum;
cout<<"\n***************************************** *********************";
cout<<"\n ";
return 0;
}

I ran this , but I think here is a lost header
#include <iostream>

#define ONE 1
#define TWO 2
#define THREE 3

int main()
{
int sum = ONE + TWO + THREE;
cout << ONE << endl;
cout << TWO << endl;
cout << THREE << endl;
cout << "Sum: " << sum << endl;
}

make me this errors
:\numbers.cpp(14) : error C2065: 'cout' : undeclared identifier
C:\numbers.cpp(14) : error C2065: 'endl' : undeclared identifier
C:\numbers.cpp(14) : warning C4552: '<<' : operator has no effect; expected operator with side-effect
C:\numbers.cpp(15) : warning C4552: '<<' : operator has no effect; expected operator with side-effect
C:\numbers.cpp(16) : warning C4552: '<<' : operator has no effect; expected operator with side-effect
C:\numbers.cpp(17) : error C2297: '<<' : illegal, right operand has type 'char [6]'
C:\numbers.cpp(18) : warning C4508: 'main' : function should return a value; 'void' return type assumed
Error executing cl.exe.

numbers.obj - 3 error(s), 4 warning(s)

so I put this using std::cout;
C:\numbers.cpp(16) : error C2065: 'endl' : undeclared identifier
C:\numbers.cpp(20) : warning C4508: 'main' : function should return a value; 'void' return type assumed
Error executing cl.exe.

numbers.exe - 1 error(s), 1 warning(s)
so i put return 0;
C:\numbers.cpp(16) : error C2065: 'endl' : undeclared identifier
Error executing cl.exe.
so finally my question is to endl , I dont know the header , would u please explain me???
thx in adv.

If you use the new headers then you must also remember that every standard name is embedded within the std namespace.

Code:

#include <iostream>

using namespace std; // Add this for the easiest fix

#define ONE 1
#define TWO 2
#define THREE 3

int main()
{
  int sum = ONE + TWO + THREE;
  cout << ONE << endl;
  cout << TWO << endl;
  cout << THREE << endl;
  cout << "Sum: " << sum << endl;
}