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Language extensions REFERENCE - ISO:C90-6.1.3.2 Integer Constants

Integer constants can be expressed in the C language in decimal, hexadecimal or octal representation. This constant appears to be expressed in a binary representation. This format is supported by some compilers but is a language extension.

For example: 


/*PRQA S 1277,2017,3120,3211,3408 ++*/

    unsigned char uca = 0x1F;           /* Hex constant */
    unsigned char ucb = 037;            /* Octal constant -  Message 0339 */
    unsigned char ucc = 0b00011111;     /* Binary constant - Message 0246 */

MISRA-C:2004 Rules applicable to message 0246:

Rule  1.1  (Required) All code shall conform to ISO/IEC 9899:1990 C programming language, ISO 9899, amended and corrected by ISO/IEC 9899/COR1:1995, ISO/IEC 9899/AMD1:1995, and ISO/IEC 9899/COR2: 1996192

See also:

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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