A preprocessor line of the form
# error token-sequenceopt
causes the preprocessor to write a diagnostic message that includes the token sequence.
Free Educations
» All free stuff in computer education
Home » Free Educations »
• • •
A control line of the form
# pragma token-sequenceopt
causes the preprocessor to perform an implementation-dependent action. An unrecognized pragma is ignored.
• • •
• • •
Several identifiers are predefined, and expand to produce special information. They, and also the preprocessor expansion operator defined, may not be undefined or redefined.
|
__LINE__ |
A decimal constant containing the current source line number. |
|
__FILE__ |
A string literal containing the name of the file being compiled. |
|
__DATE__ |
A string literal containing the date of compilation, in the form “Mmmm dd yyyy” |
|
__TIME__ |
A string literal containing the time of compilation, in the form “hh:mm:ss” |
|
__STDC__ |
The constant 1. It is intended that this identifier be defined to be 1 only in standard-conforming implementations. |
#error and #pragma are new with the ANSI standard; the predefined preprocessor macros are new, but some of them have been available in some implementations
• • •
Website Design by WebWalas.com