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ISUPPER(3)               BSD Library Functions Manual               ISUPPER(3)

NAME
     isupper -- upper-case character test

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     isupper(int c);

DESCRIPTION
     The isupper() function tests for any upper-case letter.  For single C chars locales (see multibyte(3)),
     the value of the argument is representable as an unsigned char or the value of EOF.  In the ASCII char-acter character
     acter set, this includes the following characters (preceded by their numeric values, in octal):

     101 ``A''     102 ``B''     103 ``C''     104 ``D''     105 ``E''
     106 ``F''     107 ``G''     110 ``H''     111 ``I''     112 ``J''
     113 ``K''     114 ``L''     115 ``M''     116 ``N''     117 ``O''
     120 ``P''     121 ``Q''     122 ``R''     123 ``S''     124 ``T''
     125 ``U''     126 ``V''     127 ``W''     130 ``X''     131 ``Y''
     132 ``Z''

RETURN VALUES
     The isupper() function returns zero if the character tests false and returns non-zero if the character
     tests true.

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

SEE ALSO
     ctype(3), isalnum_l(3), iswupper(3), multibyte(3), toupper(3), ascii(7)

STANDARDS
     The isupper() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD                             August 21, 2004                            BSD