question about code

Can someone tell me why I am getting the following errors? Any advice would be appreciated. The program I am writing for the header file uses long as a data type for the returned fibonacci number. The cpp file reads in a long number and returns the correspondeng fibonacci number. I am limiting the read numbers 0 to 40.


FIBOPRE3.CPP(20) : error C2065: 'cout' : undeclared identifier
FIBOPRE3.CPP(20) : error C2065: 'endl' : undeclared identifier
FIBOPRE3.CPP(20) : warning C4552: '<<' : operator has no effect; expected operator with side-effect
Error executing cl.exe.

My code is as follows:

#include "fibonacci.h"


long fibonacci( long n )
{
if ( n == 0 || n == 1 ) // base case
return n;
else // recursive case
return fibonacci( n - 1 ) + fibonacci( n - 2 );
}

void main ()
{
cout << fibonacci(40) << endl << endl;
}


Here is the code in my header file:

// Provides function to compute Fibonacci numbers

// Recursive version
long Fibonacci_Rec(int n);

First, you must include iostream. If it is not included in fibonacci you will have to add it. Second, you will have to set your namespace or preface the use of cout/endl with std:: to get the compiler to resolve the name.

I have fixed the errors and it is now compiling. But it is not outputting anything. What have I done wrong?

Can't do that without your code! Be sure to enclose it in "code" or "php" tags!

<code>
#include "fibonacci.h"


long fibonacci( long n )
{
if ( n == 0 || n == 1 ) // base case
return n;
else // recursive case
return fibonacci( n - 1 ) + fibonacci( n - 2 );
}

void main ()
{
cout << fibonacci(40) << endl << endl;
}

</code>

Here is the code in my header file:

<code>
// Provides function to compute Fibonacci numbers

// Recursive version
long Fibonacci_Rec(int n);
</code>

Look at http://forums.devshed.com/misc.php?s=&action=bbcode for explanations on codes.

I will look at what you have, but please post again while I do so.

You need to add "#include <iostream>" to either your cpp file or your header file, then prepend cout and endl with "std::". You could also use namespaces, but I will leave that as an exersize for the student.

Sorry I posted my previous code. I fixed the iostream problem and the namespace problem. I am compiling with no errors but it is not outputting anything.

Code is as follows:



My header file code:

When I run it it appears to go into an infinite loop. Check your code for correctness (I got no idea what you are trying to do).

BTW: You don't need the header file for what you are doing.

I got this to compile and run fine: