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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'' RETURN VALUES The isupper() function returns zero if the character tests false and re- turns 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 ob- solete and may not be supported in future releases. The iswupper() func- tion 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"). FreeBSD 13.0 July 17, 2005 FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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