From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/string%2Fbyte%2Fisalpha.html | 121 +++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 devdocs/c/string%2Fbyte%2Fisalpha.html (limited to 'devdocs/c/string%2Fbyte%2Fisalpha.html') diff --git a/devdocs/c/string%2Fbyte%2Fisalpha.html b/devdocs/c/string%2Fbyte%2Fisalpha.html new file mode 100644 index 00000000..3e6a7c4c --- /dev/null +++ b/devdocs/c/string%2Fbyte%2Fisalpha.html @@ -0,0 +1,121 @@ +

isalpha

Defined in header <ctype.h> 
int isalpha( int ch );
+

Checks if the given character is an alphabetic character, i.e. either an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), or a lowercase letter (abcdefghijklmnopqrstuvwxyz).

+

In locales other than "C", an alphabetic character is a character for which isupper() or islower() returns true or any other character considered alphabetic by the locale. In any case, iscntrl(), isdigit(), ispunct() and isspace() will return false for this character.

+

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

+

Parameters

+ +
ch - character to classify

Return value

Non-zero value if the character is an alphabetic character, zero otherwise.

+

Example

+

Demonstrates the use of isalpha with different locales (OS-specific).

+
#include <ctype.h>
+#include <stdio.h>
+#include <locale.h>
+ 
+int main(void)
+{
+    unsigned char c = '\xdf'; // German letter ß in ISO-8859-1
+ 
+    printf("isalpha('\\xdf') in default C locale returned %d\n", !!isalpha(c));
+ 
+    setlocale(LC_CTYPE, "de_DE.iso88591");
+    printf("isalpha('\\xdf') in ISO-8859-1 locale returned %d\n", !!isalpha(c));
+}

Possible output:

+
isalpha('\xdf') in default C locale returned 0
+isalpha('\xdf') in ISO-8859-1 locale returned 1

References

See also

+ +
+
(C95)
 checks if a wide character is alphabetic
(function)
C++ documentation for isalpha
+ + + + + + + + + + + + + + + + + +
ASCII values characters

iscntrl
iswcntrl

+

isprint
iswprint

+

isspace
iswspace

+

isblank
iswblank

+

isgraph
iswgraph

+

ispunct
iswpunct

+

isalnum
iswalnum

+

isalpha
iswalpha

+

isupper
iswupper

+

islower
iswlower

+

isdigit
iswdigit

+

isxdigit
iswxdigit

+
decimal hexadecimal octal
0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) +≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab (\t) +≠0 0 +≠0 +≠0 0 0 0 0 0 0 0 0
10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) +≠0 0 +≠0 0 0 0 0 0 0 0 0 0
14–31 \xE–\x1F \16–\37 control codes +≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 space 0 +≠0 +≠0 +≠0 0 0 0 0 0 0 0 0
33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
48–57 \x30–\x39 \60–\71 0123456789 0 +≠0 0 0 +≠0 0 +≠0 0 0 0 +≠0 +≠0
58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
65–70 \x41–\x46 \101–\106 ABCDEF 0 +≠0 0 0 +≠0 0 +≠0 +≠0 +≠0 0 0 +≠0
71–90 \x47–\x5A \107–\132 GHIJKLMNOP
QRSTUVWXYZ 		0 +≠0 0 0 +≠0 0 +≠0 +≠0 +≠0 0 0 0
91–96 \x5B–\x60 \133–\140 [\]^_` 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
97–102 \x61–\x66 \141–\146 abcdef 0 +≠0 0 0 +≠0 0 +≠0 +≠0 0 +≠0 0 +≠0
103–122 \x67–\x7A \147–\172 ghijklmnop
qrstuvwxyz 		0 +≠0 0 0 +≠0 0 +≠0 +≠0 0 +≠0 0 0
123–126 \x7B–\x7E \172–\176 {|}~ 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
127 \x7F \177 backspace character (DEL) +≠0 0 0 0 0 0 0 0 0 0 0 0
+

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Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/string/byte/isalpha +

+
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