| ISUPPER(3) |
FreeBSD 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 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'' |
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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.
STANDARDS
The
isupper() function conforms to ISO/IEC 9899:1990 (“ISO C90”).