Thread: [Dev-C++] Help Needed

I was trying to compile a small program when the following messages =
popped up in the "Compiler and Linker Output" window:

c:\windows\TEMP\cc16bbgb.o(.text+0x110):gradefv.cpp: undefined reference =
to `read(istream &, Student_info &)'
c:\windows\TEMP\cc16bbgb.o(.text+0x194):gradefv.cpp: undefined reference =
to `compare(Student_info const &, Student_info const &)'

c:\windows\TEMP\cc16bbgb.o(.text+0x2b5):gradefv.cpp: undefined reference =
to `grade(Student_info const &)'

The compilation was said to be successful though. But there was zero =
output.

By the way, I am learning C++ on my own by reading Accelerated C++ =
Practical Programming by Example by A. Koenig and B. Moo. This problem =
occurred when I attempted to compile the example program. I checked the =
authors' source code too and attempted to run theirs. Their program had =
the same problem. What could be the problem? Help will be appreciated.

jyz

Send us the source code.
=20
=20
Ioannis
=20
* Ioannis Vranos
* Programming pages: http://www.noicys.f2s.com
<http://www.noicys.f2s.com/>=20
* Alternative URL: http://run.to/noicys

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of Yimin
Sent: Wednesday, August 29, 2001 9:20 PM
To: Dev...@li...
Subject: [Dev-C++] Help Needed


I was trying to compile a small program when the following messages
popped up in the "Compiler and Linker Output" window:
=20
c:\windows\TEMP\cc16bbgb.o(.text+0x110):gradefv.cpp: undefined reference
to `read(istream &, Student_info &)'

c:\windows\TEMP\cc16bbgb.o(.text+0x194):gradefv.cpp: undefined reference
to `compare(Student_info const &, Student_info const &)'

c:\windows\TEMP\cc16bbgb.o(.text+0x2b5):gradefv.cpp: undefined reference
to `grade(Student_info const &)'

The compilation was said to be successful though. But there was zero
output.

By the way, I am learning C++ on my own by reading Accelerated C++
Practical Programming by Example by A. Koenig and B. Moo. This problem
occurred when I attempted to compile the example program. I checked the
authors' source code too and attempted to run theirs. Their program had
the same problem. What could be the problem? Help will be appreciated.

jyz

[Project]
FileName=D:\temp\s\Grades.dev
Name=Grades
Use_gpp=1
UnitCount=7
ResFiles=D:\temp\s\rsrc.rc
NoConsole=0
IsDll=0
Icon=C:\Usr\Shared\APPLIC~1\DEVC__~1\Bin\Mainicon.ico
[Unit1]
FileName=D:\temp\s\grade.cpp
FileTime=723406292
[Unit2]
FileName=D:\temp\s\grade.h
[Unit3]
FileName=D:\temp\s\gradefv.cpp
[Unit4]
FileName=D:\temp\s\median.cpp
[Unit5]
FileName=D:\temp\s\median.h
[Unit6]
FileName=D:\temp\s\Student_info.cpp
[Unit7]
FileName=D:\temp\s\Student_info.h

Thanks, Johannes, for your help. jyz
  ----- Original Message -----=20
  From: Johannes Pretorius=20
  To: dev...@li...=20
  Sent: Thursday, August 30, 2001 12:50 AM
  Subject: Re: [Dev-C++] Help Needed


  Lo there
  ------------
  There is 2 things wrong with this program. First the projects is not =
correct (there is no project file) make one or Edit=20
  the one I attached to point to your paths.

  Secondly there is no function writen for the grade function declared =
in the header for grade.cpp
  I wrote a dummy like

  //=3D=3D=3D=3D=3D=3D SNIP =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
  double grade(const Student_info& student){
     //Some stuff to get the grade :)..
     return -1;
  }
  //=3D=3D=3D END SNIP =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

  Well I hope this helps. After that it all compiles and works

  PS : The reason the stuff didnt compile first is because the header =
files was not in the Compiler's path to start from=20

  Well C ya
  Johannes



  At 16:37 29/08/2001 -0700, you wrote:

    Thank you, Ioannis, for responding to my inquiry. Here are the =
files. For your information I was trying to compile "gradefv.cpp" with =
all other cpp files and header files. Thanks.
    =20
    jyz=20
      ----- Original Message -----=20
      From: Ioannis Vranos=20
      To: dev...@li...=20
      Sent: Wednesday, August 29, 2001 3:38 PM=20
      Subject: RE: [Dev-C++] Help Needed


      Send us the source code.=20
      =20
      =20
      Ioannis=20
      =20
      * Ioannis Vranos=20
      * Programming pages: http://www.noicys.f2s.com=20
      * Alternative URL: http://run.to/noicys=20
      -----Original Message-----=20
      From: dev...@li... =
[mailto:dev...@li...] On Behalf Of Yimin=20
      Sent: Wednesday, August 29, 2001 9:20 PM=20
      To: Dev...@li...=20
      Subject: [Dev-C++] Help Needed


      I was trying to compile a small program when the following =
messages popped up in the "Compiler and Linker Output" window:=20
      =20
      c:\windows\TEMP\cc16bbgb.o(.text+0x110):gradefv.cpp: undefined =
reference to `read(istream &, Student_info &)'


      c:\windows\TEMP\cc16bbgb.o(.text+0x194):gradefv.cpp: undefined =
reference to `compare(Student_info const &, Student_info const &)'


      c:\windows\TEMP\cc16bbgb.o(.text+0x2b5):gradefv.cpp: undefined =
reference to `grade(Student_info const &)'


      The compilation was said to be successful though. But there was =
zero output.


      By the way, I am learning C++ on my own by reading Accelerated C++ =
Practical Programming by Example by A. Koenig and B. Moo. This problem =
occurred when I attempted to compile the example program. I checked the =
authors' source code too and attempted to run theirs. Their program had =
the same problem. What could be the problem? Help will be appreciated.


      jyz

Hi,

I took a quick look at your source code, there is something that needs to 
be fixed but first here is why you get the 3 "undefined" errors. As the 
word "undefined" says, there is some definition missing: your program is 
made up of 4 source files, this means that to build the executable you need 
to compile the 4 files and link them together.

If you use the Dev-C++ IDE you should create a project, add the 4 source 
files to it and then go ahead with a compilation (which in the case of 
Dev-C++ implies also the linking step).

I think that you just opened the file "gradefv.cpp" in the edit window of 
Dev-C++ and then went on with a compilation: since you did not specify 
where the definitions of the 3 functions "read", "compare" and "grade" are, 
the linker issued the "undefined" error.

As I said before there is something more:
- I looked at the file "grade.cpp" but saw no definition for the function 
"double grade(const  Student_info&)": this means that even if you link 
"grade.cpp", there will still be an "undefined" error about this function.

- To be consistent with your programming style, the file "median.cpp" 
should include the file "median.h"

Just in case you are not using the Dev-C++ IDE, but are familiar with the 
"make" program and the CLI interface of mingw, I attached the files 
"gradefv.mk" and "b.bat" which you could use to build your program.

At 12.20 29/08/01 -0700, you wrote:
>I was trying to compile a small program when the following messages popped 
>up in the "Compiler and Linker Output" window:
>
>c:\windows\TEMP\cc16bbgb.o(.text+0x110):gradefv.cpp: undefined reference 
>to `read(istream &, Student_info &)'
>
>c:\windows\TEMP\cc16bbgb.o(.text+0x194):gradefv.cpp: undefined reference 
>to `compare(Student_info const &, Student_info const &)'
>
>c:\windows\TEMP\cc16bbgb.o(.text+0x2b5):gradefv.cpp: undefined reference 
>to `grade(Student_info const &)'
>
>The compilation was said to be successful though. But there was zero output.
>
>By the way, I am learning C++ on my own by reading Accelerated C++ 
>Practical Programming by Example by A. Koenig and B. Moo. This problem 
>occurred when I attempted to compile the example program. I checked the 
>authors' source code too and attempted to run theirs. Their program had 
>the same problem. What could be the problem? Help will be appreciated.
>
>jyz

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