Thread: Advanced C Question: #line and #ifndef stuff

All source code is available at: http://www.cs.ucsb.edu/~cs165a/software.html

I'm trying to compile http://www.cs.ucsb.edu/~cs165a/Softw...c/CNFDemo.html

Files I'm using (all available in the zip file):

CNFDemo.cpp

KnowledgeBase.cpp
KnowledgeBase.h

parser.cpp
parser.h

lex.yy.cpp (commented out #include <unistd.h> because the file is blank anyway)
y.tab.cpp
y.tab.h

I'm having a lot of trouble getting the program to run. So far I've figured out it's because of the #line funny business going on in y.tab.cpp. It runs up to a certain point and then just quits unexpectedly (Visual Studio says "there is no source code for the following line). So I commented out a lot of that stuff and now it runs a bit farther. But it still just stops randomly.

Can anyone get this program to compile?

What moron coded this I would ask? I see gotos.
And it is C++, btw, not C.
But the "no source code" thingy just means that the debugger cannot find the source for that specific part of the code, not that it does not exist or does not run. You should make sure you compile and create symbols for the code and the debugger should work correctly.

Usually "no source code" means that you are inside a DLL or library function that you haven't got source code for. If you have the source for the library, you can recompile with debug settings, but likely is that you do not have the source code for the library or DLL, in which case it's "tough luck". But usually, you can get a call-stack and figure out from that where your problem stems from.

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Mats

Dude, we're telling you - it IS compiled, there is nothing wrong with it. You simply lack debug information about it.
To compile as Debug, you would choose Debug from the drop-down list which typically says Release or Debug.
The call-stack is a window at the bottom of the IDE, which displays the entire call stack so far.

Note however that just because you compile the library YOU are using, doesn't mean that other libraries aren't being used, and you may not have access to the source-code that is failing. Let's say we write some stupid code like this:

Code:

...
FILE *f = (FILE *)12345678;

fprintf(f, "Hello, world\n");

then the crash would happen in fprintf() - you may not have source code for fprintf() [or debug symbols for the C runtime library that has the function in it]. But using the call-stack window to find the call to fprintf, you may be able to figure out what is being done.

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Mats

Originally Posted by Elysia

Dude, we're telling you - it IS compiled, there is nothing wrong with it. You simply lack debug information about it.
To compile as Debug, you would choose Debug from the drop-down list which typically says Release or Debug.
The call-stack is a window at the bottom of the IDE, which displays the entire call stack so far.

I'm not sure I follow? If I hit run, the program quits without getting past the first line of main.

Were you able to get CNFDemo.cpp to run to the end?

Originally Posted by Paul22000

I'm not sure I follow? If I hit run, the program quits without getting past the first line of main.

If the code is not compiled, then you cannot debug it and obviously you were debugging it, so the code is compiled.
If it works correctly, without bugs and so, is another story.

Were you able to get CNFDemo.cpp to run to the end?

Unfortunately not, because this seemed like some "multi-platform" crap (sorry for saying so). They always make it difficult to get the thing compiled or whatever. I'm not up for the task.
I just want a visual studio project to launch up and compile. But there was no such thing, was there (or did I miss it because of the Linux-style readme files?)?

Actually, Bison is a dialect of Yacc, which is a "compiler compiler" - a tool that takes a "human" readable input and produces C code to parse "code". The yy-stuff is not a stupid library, but a result of the Bison (or Yacc - that's why it's "yy") reading it's input file.

Yacc/Bison is often used in conjunction with (f)lex.

Have you actually asked your teacher if this code is supposed to work, as I expect you aren't supposed to work in teh Yacc code, but rather use the source code for AI programming?

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Mats