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Manual Pages  — ISUPPER

NAME

isupper – upper-case character test

CONTENTS

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 representable as an unsigned char or the value of EOF.

In the ASCII character set, this includes the following characters (with their numeric values shown 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 BSD 4.4 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), iswupper(3), toupper(3), ascii(7)

STANDARDS

The isupper() function conforms to ISO/IEC 9899:1990 ("ISO C90").

ISUPPER (3) July 17, 2005

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