You can cause the compiler to increment line numbers during
compilation from a number specified in a line control directive.
(The resulting line numbers appear in error message references,
but do not alter the line numbers of the actual source code.)
Description |
 |
The #line
preprocessing directive causes the compiler to treat lines following
it in the program as if the name of the source file were filename
and the current line number is digit-sequence.
This is to control the file name and line number that is given in
diagnostic messages, for example. This feature is used primarily
for preprocessor programs that generate C code. It enables them
to force the HP C compiler to produce diagnostic messages with respect
to the source code that is input to the preprocessor rather than
the C source code that is output and subsequently input to the compiler.
HP C defines two macros that you can use for error diagnostics.
The first is __LINE__,
an integer constant equal to the value of the current line number.
The second is __FILE__,
a quoted string literal equal to the name of the input source file.
Note that you can change
__FILE__
and __LINE__
using #include
or #line directives.
