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isnumber (3)
  • >> isnumber (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    isdigit, isnumber
    
     - decimal-digit character test
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <ctype.h>
    int isdigit (int c);
    int isnumber (int c);
     

    DESCRIPTION

    The isdigit ();
    function tests for a decimal digit character. Regardless of locale, this includes the following characters only:

    "``0'' ``1'' ``2'' ``3'' ``4''"
    "``5'' ``6'' ``7'' ``8'' ``9''"

    The isnumber ();
    function behaves similarly to isdigit (,);
    but may recognize additional characters, depending on the current locale setting.

    The value of the argument must be representable as an Vt unsigned char or the value of EOF  

    RETURN VALUES

    The isdigit ();
    and isnumber ();
    functions return zero if the character tests false and return non-zero if the character tests true.  

    COMPATIBILITY

    The BSD 4.4 extension of accepting arguments outside of the range of the Vt unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. The iswdigit ();
    function should be used instead.  

    SEE ALSO

    ctype(3), iswdigit(3), multibyte(3), ascii(7)  

    STANDARDS

    The isdigit ();
    function conforms to St -isoC .  

    HISTORY

    The isnumber ();
    function appeared in BSD 4.4


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    COMPATIBILITY
    SEE ALSO
    STANDARDS
    HISTORY


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