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isupper |
Portability: | ISO/ANSI C conforming, UNIX compatible |
SYNOPSIS | |
DESCRIPTION | |
RETURN VALUE | |
CAUTION | |
EXAMPLE | |
RELATED FUNCTIONS | |
SEE ALSO |
SYNOPSIS |
#include <ctype.h> int isupper(int c);
DESCRIPTION |
isupper
tests an integer value
c
to determine whether
it is an uppercase alphabetic character.
RETURN VALUE |
isupper
returns 0 if the character is not an uppercase alphabetic character, or a
nonzero value if it is. If the argument is
EOF
, 0 is returned.
CAUTION |
The effect of
isupper
on a noncharacter argument other than
EOF
is undefined. The definition of an uppercase character is locale
dependent. Do not assume that
isupper
returns
either 0 or 1.
EXAMPLE |
#include <ctype.h> #include <stdio.h> #define MAXLEN 40 main() { char id[MAXLEN +1]; char *text; char input[MAXLEN +1]; int i; printf("Enter a string (maximum of %d characters):\n", MAXLEN); text = gets(input); /* Copy uppercase "identifier" from text to id. */ for (i = 0; i < 40 && isupper(text[i]); ++i) id[i] = text[i]; id[i] = '\0'; /* Only initial uppercase characters get copied. */ printf("%s\n", id); }
RELATED FUNCTIONS |
isalpha
,
islower
,
tolower
,
toupper
SEE ALSO |
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