Problem Linking Headers and Source File

[MoreUmph]

Hello, im new to c++ and am trying to link a header and source file to my main source file.

Its simple and ive looked at videos everywhere and read alot forum posts and tried many different things to no avail.

I defined the class Dialogue in Dialogue.h
Set it to cout "\n" in Dialogue.cpp (Just starts a newline in between text)
print out "Hello" then goes to a newline "person" in the main Source File

// MainSource.cpp

#include "Dialogue.h"
#include <iostream>
#include <string>

using namespace std;



int main()
{
Dialogue Dialogue1;
    cout << "Hello, ";
dialogue1.singlespace();
    cout << "person.";
            
    return 0;
}

Dialogue.cpp Error:
Line 8 Col 1 [Error] prototype for 'int Dialogue::singlespace()' does not match any in class 'Dialogue'
Line 9 Col 1[Error] candidate is: void Dialogue::singlespace()

// Dialogue.cpp

#include "Dialogue.h"
#include <iostream>

using namespace std;



void Dialogue::singlespace()
{
	cout "\n";

return 0;
}

// Dialogue.h

#ifndef DIALOGUE_H
#define DIALOGUE_H
#include <iostream>
#include <string>

class Dialogue
{
public:
  void singlespace();

};

#endif 

[Thomas1965]

On line 10 in your Dialogue.cpp you forgot the return type. Also on line 12 you need a ;

In MainSource.cpp you need to create an object of the class Dialogue before you can call a method of the class.

[MoreUmph]

What do you mean I forgot the return type? The only place to put a return is line 14. Im new to C++ could you reiterate please.

Updated code

[Thomas1965]

In Dialogue.h you have void singlespace();

In Dialogue.cpp it needs to be void Dialogue::singlespace()

In main it should be

Dialogue Dialogue1;
cout << "Hello, ";
Dialogue1.singlespace();
cout << "person.";

[MoreUmph]

The first error is gone, thanks my dude.

Now I'm getting error in main

Line 13 Dialogue1 was not declared in this scope

[Thomas1965]

What does your main() look like now ?

[MoreUmph]

Updated

[Thomas1965]

C++ is case sensitive so it must be Dialogue1.singlespace(); on line 15

[MoreUmph]

Thanks mustve missed that, more errors thought.
Im starting to think im fucking up terribly bad somewhere if it takes me 12 hours to link a file.

In main:

undefined reference to `Dialogue::singlespace()'
[Error] ld returned 1 exit status


In Dialogue.h
In member function 'void Dialogue::singlespace()':
Line 11 Col 7 [Error] expected ';' before string constant
Line 13 Col 8 [Error] return-statement with a value, in function returning 'void' [-fpermissive]

[Enoizat]

am trying to link a header and source file to my main source file

For precision sake, what you want to link are MainSource.cpp and Dialogue.cpp.
Dialogue.h will not be linked, but will be included (=copied into) by this directive:
#include "Dialogue.h"

You can try to compare your code to the following, which compiles:
MainSource.cpp

#include <iostream>
#include <string>
#include "Dialogue.h"

using namespace std;

int main()
{
    Dialogue dialogue1;
    cout << "Hello, ";
    dialogue1.singlespace();
    cout << "person.";
    return 0;
}

Dialogue.cpp

#include <iostream>
#include "Dialogue.h"

using namespace std;

void Dialogue::singlespace()
{
    cout << "\n";
}

Dialogue.h

#ifndef DIALOGUE_H
#define DIALOGUE_H

#include <iostream>
#include <string>

class Dialogue
{
public:
    void singlespace();
};

#endif 

In Dialogue.h
In member function 'void Dialogue::singlespace()':
Line 11 Col 7 [Error] expected ';' before string constant
Line 13 Col 8 [Error] return-statement with a value, in function returning 'void' [-fpermissive]

I’m pretty sure the error referred to Dialogue.cpp, not Dialogue.h.
You need “<<” after “cout”:
cout << "\n";
And you can’t return anything from a “void” function:

void Dialogue::singlespace()
{
    cout << "\n";
    return 0;
}

... if it takes me 12 hours to link a file.

You can safely relax :-)
In 99.99% of courses or tutorial or whatever, C++ is explained in such a conceptual, academic and abstract style that everybody comes across troubles the first time tries to do something by their own. Just press ahead and don’t let these setbacks depress you.

[MoreUmph]

Thank you my dude, Ill go over this when I wake up. Discovered trying to code feeling like a zombie causes many stupid issues. Again thanks everyone for the replies Ill check back tomorrow.

[wildblue]

The function is putting out a newline character - if it really should be a single space, it can change to cout << " "

[MoreUmph]

Enoizat tried your code and it wont compile for me strange error.

Line 18
C:\crossdev\src\mingw-w64-v3-git\mingw-w64-crt\crt\crt0_c.c undefined reference to `WinMain'

returning 1 exit status also. Using DevC++ IDE.



wildblue I know what it does dw about it my man.

[Enoizat]

Line 18
C:\crossdev\src\mingw-w64-v3-git\mingw-w64-crt\crt\crt0_c.c undefined reference to `WinMain'

Line 18? There isn't the 18^th line in any file :-) :-)
What are you compiling?
1) about Dev-C++:
http://www.cplusplus.com/articles/36vU7k9E/

2) We can try to compile directly from a DOS console, if your MinGw version is correctly installed (i.e. it appears in the path).
To discover this, please open a DOS console and type:
g++ --version
followed by ENTER.
If the system answers with a meaningful statement, like (more or less):

g++ (GCC) 7.1.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

we can go on.

You just need to enter the folder where are you files and type:
g++ MainSource.cpp Dialogue.cpp -o dialogue.exe
The program should compile. Then, to execute it, just type:
dialogue.exe
and press ENTER.

[ne555]

> undefined reference to `WinMain'
chose `Console Project'