why does the complier complain undeclare identifier even though i have included the header file?

[thinktwice]

my project contains tens of files, it compiles well . now i need to add
several class implementation files to the project which are similar
with the classes already exist in
the project, so i add new files and copy the code from the exsited
files(sure need some
modification). but the compiler complains 'classxxx" undeclared
identifier.

[Victor Bazarov]

thinktwice wrote:

my project contains tens of files, it compiles well . now i need to
add several class implementation files to the project which are
similar with the classes already exist in
the project, so i add new files and copy the code from the exsited
files(sure need some
modification). but the compiler complains 'classxxx" undeclared
identifier.

This is covered in the FAQ. See 5.8 and 5.9.

V
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Please remove capital As from my address when replying by mail

[Jim Langston]

"thinktwice" <me*********@gmail.com> wrote in message
news:11**********************@o13g2000cwo.googlegr oups.com...

my project contains tens of files, it compiles well . now i need to add
several class implementation files to the project which are similar
with the classes already exist in
the project, so i add new files and copy the code from the exsited
files(sure need some
modification). but the compiler complains 'classxxx" undeclared
identifier.

Most likely causes are mistyped class names (MyClass instead of myclass for
instance, MyClas for another instance), include files not included where
they should be, improper include guards (did you change the include guards
to match your header and make sure no other header used the same defines?).

[Daniel T.]

In article <11**********************@o13g2000cwo.googlegroups .com>,
"thinktwice" <me*********@gmail.com> wrote:

my project contains tens of files, it compiles well . now i need to add
several class implementation files to the project which are similar
with the classes already exist in
the project, so i add new files and copy the code from the exsited
files(sure need some
modification). but the compiler complains 'classxxx" undeclared
identifier.

It's complaining because you haven't properly declared classxxx in the
context in which it is complaining about. I know that seems pretty
obvious, but there you go.

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on experience; it is open to correction by observation and experiment.