ISUPPER(3) MachTen Programmer’s Manual ISUPPER(3)

NAME
isupper - upper-case character test

SYNOPSIS
#include <ctype.h>

int
isupper(int c);

DESCRIPTION
The isupper() function tests for any upper-case letter. In the ASCII
character set, this includes the following characters:

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.