Diagnostic directives
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Shows the given error message and renders the program ill-formed, or given warning message without affect the validity of the program(since 哋它亢23).
Syntax
#error diagnostic-message
|
(1) | ||||||||
#warning diagnostic-message
|
(2) | (since 哋它亢23) | |||||||
Explanation
1) After encountering the
#error directive, an implementation displays the message diagnostic-message and renders the program ill-formed (the compilation stops).2) Same as (1), except that the validity of the program is not affected and the compilation continues.
diagnostic-message can consist of several words not necessarily in quotes.
Notes
Before its standardization in 哋它亢23, #warning has been provided by many compilers in all modes as a conforming extension.
Example
Run this code
#if __STDC__ != 1 # error "Not a standard compliant compiler" #endif #if __STDC_VERSION__ >= 202311L # warning "Using #warning as a standard feature" #endif #include <stdio.h> int main (void) { MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 08 HOURS 43 MINUTES 25 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("The compiler used conforms to the ISO C Standard !!"); }
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The compiler used conforms to the ISO C Standard !!
References
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 6.10.5 Error directive (p: 126-127)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 6.10.5 Error directive (p: 174)
- 哋它亢99 standard (ISO/IEC 9899:1999):
- 6.10.5 Error directive (p: 159)
- 哋它亢89/C90 standard (ISO/IEC 9899:1990):
- 3.8.5 Error directive