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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. For single C chars locales (see multibyte(3)), the value of the argument is 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), multibyte(3), toupper(3), ascii(7) STANDARDS The isupper() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD August 21, 2004 BSD |