Linking Code/Objects Using DevC++ IDE

[Sputnik]

Hello everyone,

Ive searched documentation all over the net and yet I cannot seem to find how to link code/object using Bloodshed DevC++ IDE.

A simple example just to demonstrate what I need:

#include <iostream>
using namespace std;

int main(){
int a;
cout<<"enter a number to find its double value: ";
cin>>a;
cout<<"The numbers double is: "<<doublevalue(a);

return (0);
}

That above code compiled alone will give an error saying the function doublevalue() is not defined, but I want to LINK the above function "doublevalue()" to another code that defines it:

int doublevalue(int a){ //This is a function to be linked to the main code
b=2*a;
return (b);
}

What I do know is that I must somehow first seperately compile them and save the code to be linked as an object file or something?

Any help?

[Albatross]

If you're using Dev-C++ (which we disrecommend due to the last release's age), then all you should have to do is write the file and include it in your project along with a header file that contains the function's prototype. Remember to include the header file in both files.

Small print: Actually, you can include C++ files using #include which renders the header file irrelevant but... don't... don't do that. It's quite dangerous.

-Albatross

[Athar]

You cannot use double as an identifier anyway, since it is a reserved keyword.

[Sputnik]

Albatross wrote:

If you're using Dev-C++ (which we disrecommend due to the last release's age), then all you should have to do is write the file and include it in your project along with a header file that contains the function's prototype. Remember to include the header file in both files.

Small print: Actually, you can include C++ files using #include which renders the header file irrelevant but... don't... don't do that. It's quite dangerous.

Um, you mean make a single project and include two source files in it (one the body (first code) and the other the object to be linked to(second code))? Then I also include header files containing the function name? I did those two simple things and compiled to get an error saying:
"doublevalue: No such file or directory"

I included the header:

#include <doublevalue> 

...in both the main code and the object code (the code to be linked to).
Maybe the header I provided above is incorrect but I tried all variations of it including adding (int a) etc etc...

Its not picking up the function to be linked to. I know you dont use Dev, so you wont know the exact step by step, but someone out there, can they be very specific on how to actually do this?

I really need a step by step process to simply link the above code I provided. I know it takes roughly 30 seconds to do and takes roughly two steps but nowhere on the entire internet can I find how to do this. Ive looked for 2 months on the net just how to do this trivial task. Im really surprised no one has asked this.

Athar wrote:

You cannot use double as an identifier anyway, since it is a reserved keyword.

Fixed ;)

[AngelHoof]

Athar wrote:

You cannot use double as an identifier anyway, since it is a reserved keyword.

Don't be silly... doublevalue is not a reserved keywoard, it's perfectly fine.

it's the same as:

int = reserved
int intmyvariable = not reserved

[Sputnik]

AngelHoof, Athar was referring to my pre-edited post where I had used "double" in the original post and then I edited my post to have "doublevalue", so Athar was actually right according to the pre-edited post. But you are also right that now doublevalue wouldnt matter. Mis-understanding thats all :)

[Sputnik]

Is it okay if an administrator or forum manager move this thread in the "General C++ Programming" forum instead of this beginners forum?

I just feel I may get more answers there.

Neither do I want to re post this there because ill come across as an annoying spammer and its sort of against the rules to flood this forum with repeated questions.

[Athar]

This is definitely a basic question, so this forum is the right one.
Don't write <doublevalue>, but "doublevalue". If you enclose the file name in <>, the compiler will search the standard include paths for the file, instead of the project's directory. Give your header an extension (.h or .hpp), or else Dev-C++ might be confused.