Hi everyone,
if I include the header,
- #include "Test_Case.h"
and also define it,
#ifndef _TEST_CASE_H
#define _TEST_CASE_H
code ~~
#endif
anyone know why do i still get this :
one or more multiply defined symbols found
Error executing link.exe.
Hi everyone,
if I include the header,
- #include "Test_Case.h"
and also define it,
#ifndef _TEST_CASE_H
#define _TEST_CASE_H
code ~~
#endif
anyone know why do i still get this :
one or more multiply defined symbols found
Error executing link.exe.
We'd have to see more code. Be warned that variables and macros starting with an underscore '_' are reserved to whoever implemented the libraries that come with your compiler. Basically, that means that if you create a variable that starts with an underscore, it might already be used and it will cause an error. This is probably not the case here so we need to see more code. Give us only the pre-compiler code (i.e. lines that start with #) since this is the linking part and as you can tell by the error, the linking has failed (which comes before compiling).
Always thought that linkage is done after compilation...the linking has failed (which comes before compiling).
Check that you don't define global variables in your header.one or more multiply defined symbols found
And you should not put any function bodies there also.
The whole header file text will be usefull
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
If it's a linker error, check that you haven't linked any object file multiple times. If you follow the standard convention of declaration in header files and implementation in source files, the code should compile without problems, as far as I see.
Code:#include <stdio.h> void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){ puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9 /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i] ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][ t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}
> anyone know why do i still get this :
Because include guards only work just the once for each source file you include it in.
Including the same file in several source files will create several definitions, if your header file contains definitions.
The real answer is to make sure your header only contains declarations.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Actually, identifiers starting with an underscore followed by another underscore or an uppercase letter are reserved. That is, these are reserved:Be warned that variables and macros starting with an underscore '_' are reserved to whoever implemented the libraries that come with your compiler. Basically, that means that if you create a variable that starts with an underscore, it might already be used and it will cause an error.
But these aren't:Code:_INCLUSION_GUARD __reserved ___something
[edit] Sort of like this, if you like REs:Code:_variable _256[/edit]Code:if(name =~ /_[A-Z_]/) { reserved(); }
One example of what Salem said is declaring a non-static global variable in a header file. Including this header file multiple times would cause an error much like you posted.
dwk
Seek and ye shall find. quaere et invenies.
"Simplicity does not precede complexity, but follows it." -- Alan Perlis
"Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
"The only real mistake is the one from which we learn nothing." -- John Powell
Other boards: DaniWeb, TPS
Unofficial Wiki FAQ: cpwiki.sf.net
My website: http://dwks.theprogrammingsite.com/
Projects: codeform, xuni, atlantis, nort, etc.
Thanks everyone.
I manage to solve it.
Could u please tell us, how did u manage to solve it??
S_ccess is waiting for u. Go Ahead, put u there.
