Comments on: 1.8 — Programs with multiple files

By: jonathan.mclaren

jonathan.mclaren — Sat, 21 Jan 2012 20:30:08 +0000

I am dealing with the same error.

It resolves when I add the add() below the main(), though the point of this is to rely on add() in a separate file. I would greatly appreciate help with this.

By: ionman101

ionman101 — Sat, 17 Dec 2011 16:04:52 +0000

I found out why it isnt running on codeblocks (atleast on my computer). When you open a new file for the project, it creates the file with just *.c instead of *.cpp. Try saving the new “add” file with .cpp at the end. I did that and it ran with no errors

By: myths

myths — Sat, 05 Nov 2011 04:39:16 +0000

the example for the add.cpp does not show the
#include “stdafx.h”//it is an individual .cpp

#include //it has a return function

it needs to be included…

By: socal93

socal93 — Wed, 02 Nov 2011 04:27:00 +0000

I couldnt get this to run….. When i compile the the two files i get a error saying ” Undefined reference to add(int,int) ”

I have the code set up all the same as yours. Im assuming that the compiler doesnt see add.cpp.

Im using code::blocks.

By: zingmars

zingmars — Sat, 08 Oct 2011 12:15:19 +0000

something’s up with your compiler. Re-install & reconfigure.

By: marki123

marki123 — Sun, 25 Sep 2011 11:27:11 +0000

i have put in the code for both files in to code blocks exactly. \(main and add)
but when it comes to compiling it it seems fine with the code but give the warning message.
“WARNING: Can’t read file’s timestamp: C:\Documents and Settings\Desktop\multi-file programs\Untitled1.c
Linking console executable: bin\Debug\multi-file programs.exe
mingw32-g++.exe: obj\Debug\Untitled1.o: No such file or directory

By: pshetty

pshetty — Fri, 16 Sep 2011 22:51:03 +0000

for those of you who faced linker errors, the reason could be that you did not add the iostream header file in your cpp file where you have defined the function

By: Babysabre

Babysabre — Sun, 07 Aug 2011 04:35:59 +0000

I’m using Code::Blocks and it’s complaining about multiple definitions:

File              Line  Message
obj\debug\extra.o       In function 'Z3addii'
F:\C++\test\ad... 2     multiple definitions of 'add(int, int)'
Obj\Debug\add.... 2     first defined here
                        === Build finished: 2 errors, 0 warnings ===

By: Aditya

Aditya — Thu, 14 Apr 2011 09:20:09 +0000

I use a turbo c++ 3.0 compiler. It has worked perfectly in every code so far.
I have tried the above code word for word but it didn’t work. it doesn’t link it.
do I have to follow some extra steps??

By: bitpoint

bitpoint — Sun, 03 Apr 2011 23:38:36 +0000

It should probably be mentioned here that #include “stdafx.h” should be placed at the top of each file as the program did not compile without it. I had assumed incorrectly that the compiler would simply include whatever was on the main function file for each file. I’m assuming if you want to include anything else it must be placed at the top of each file.