Re: [Dev-C++] Help Needed

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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