Классы.

[MAKEDON]

При компиляции кода выдает две ошибки. В чем проблема?

D:\Microsoft Visual C++ 6.0\MSDev98\MyProjects\cpp\classes\ 1.cpp(12) : error C2533: 'DataClass::DataClass' : constructors not allowed a return type
D:\Microsoft Visual C++ 6.0\MSDev98\MyProjects\cpp\classes\ 1.cpp(21) : error C2264: 'DataClass::DataClass' : error in function definition or declaration; function not called
Error executing cl.exe.

classes.exe - 2 error(s), 0 warning(s)

#include <iostream.h>

class DataClass{
private:
	int PrivateDataMember;
public:
	DataClass(int value);
	int PublicDataMember;
	int PublicMethod(void);
}

DataClass::DataClass(int value){
	PrivateDataMember=value;
}

int DataClass::PublicMethod(void){
	return PrivateDataMember;
}

void main(){
	DataClass DataObject(1);
	DataObject.PublicDataMember=2;
	cout <<"PublicDataMember="
		 <<DataObject.PublicDataMember<<"\n";
	cout <<"DataObject.PrivateDataMember="
		 <<DataObject.PublicMethod()<<"\n";
}

[profi]

#include <iostream.h>

class DataClass{
private:
	int PrivateDataMember;
public:
	DataClass(int value);
	int PublicDataMember;
	int PublicMethod(void);
};

DataClass::DataClass(int value){
	PrivateDataMember=value;
}

int DataClass::PublicMethod(void){
	return PrivateDataMember;
}

int main(){
	DataClass DataObject(1);
	DataObject.PublicDataMember=2;
	cout <<"PublicDataMember="
		 <<DataObject.PublicDataMember<<"\n";
	cout <<"DataObject.PrivateDataMember="
		 <<DataObject.PublicMethod()<<"\n";
		 
		 return 0;
}