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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.  The value of the argument must be repre-sentable representable
     sentable as an unsigned char or the value of EOF.

     In the ASCII character 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), toupper(3), ascii(7)

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

BSD                              July 17, 2005                             BSD