[Dev-C++] compiling project fails

[<m.d...@fe...>]

Need help!
When compiling the following dev-c++ project I get some errors:

#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
    int a;
    a = cin.get();
}
class CBruchzahlen
{
      private:
              long lZaehler;
              long lNenner;
              
      public:
             void sayHello(char * message);
             
}
void CBruchzahlen::sayHello(char * message)
{
	cout << "Test";                            
}

Errors:
-) new types may not be defined in a return type
-) two or more data types in declaration of `sayHello'
-) prototype for `CBruchzahlen CBruchzahlen::sayHello(char*)' does not match
any in class `CBruchzahlen'

Can anyone help?

Markus