isupper
—
upper-case character test
Standard C Library (libc, -lc)
#include <ctype.h>
int
isupper
(int
c);
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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The isupper
() function returns zero if the character
tests false and returns non-zero if the character tests true.
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.
The isupper
() function conforms to
ISO/IEC 9899:1990 (“ISO C90”).