std::isupper
From cppreference.com
Defined in header
<cctype>
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int isupper( int ch );
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Checks if the given character is an uppercase character as classified by the currently installed C locale. In the default "C" locale, isupper
returns true only for the uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ
).
If isupper
returns true, it is guaranteed that iscntrl, isdigit, ispunct, and isspace return false for the same character in the same C locale.
The behavior is undefined if the value of ch
is not representable as unsigned char and is not equal to EOF.
Contents |
[edit] Parameters
ch | - | character to classify |
[edit] Return value
Non-zero value if the character is an uppercase letter, zero otherwise.
[edit] Example
Run this code
#include <iostream> #include <cctype> #include <clocale> int main() { unsigned char c = '\xc6'; // letter Æ in ISO-8859-1 std::cout << "isupper(\'\\xc6\', default C locale) returned " << std::boolalpha << (bool)std::isupper(c) << '\n'; std::setlocale(LC_ALL, "en_GB.iso88591"); std::cout << "isupper(\'\\xc6\', ISO-8859-1 locale) returned " << std::boolalpha << (bool)std::isupper(c) << '\n'; }
Output:
isupper('\xc6', default C locale) returned false isupper('\xc6', ISO-8859-1 locale) returned true
[edit] See also
checks if a character is classified as uppercase by a locale (function template) |
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checks if a wide character is an uppercase character (function) |
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C documentation for isupper
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ASCII values (hex) |
characters |
isupper |
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0 - 8 | 0x00-0x08
|
control codes (NUL , etc.)
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
9 | 0x09
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tab (\t )
|
≠0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
10 - 13 | 0x0A-0x0D
|
whitespaces (\n ,\v ,\f ,\r )
|
≠0
|
0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
14 - 31 | 0x0E-0x1F
|
control codes |
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
32 | 0x20
|
space | 0
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≠0
|
≠0
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≠0
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0
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0
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0
|
0
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0
|
0
|
0
|
0
|
33 - 47 | 0x21-0x2F
|
!"#$%&'()*+,-./
|
0
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≠0
|
0
|
0
|
≠0
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≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
48 - 57 | 0x30-0x39
|
0123456789
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0
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≠0
|
0
|
0
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≠0
|
0
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≠0
|
0
|
0
|
0
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≠0
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≠0
|
58 - 64 | 0x3a-0x40
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:;<=>?@
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0
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≠0
|
0
|
0
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≠0
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≠0
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0
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0
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0
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0
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0
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0
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65 - 70 | 0x41-0x46
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ABCDEF
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0
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≠0
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0
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0
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≠0
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0
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≠0
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≠0
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≠0
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0
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0
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≠0
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71 - 90 | 0x47-0x5A
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GHIJKLMNOPQRSTUVWXYZ
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0
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≠0
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0
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0
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≠0
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0
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≠0
|
≠0
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≠0
|
0
|
0
|
0
|
91 - 96 | 0x5B-0x60
|
[\]^_`
|
0
|
≠0
|
0
|
0
|
≠0
|
≠0
|
0
|
0
|
0
|
0
|
0
|
0
|
97 -102 | 0x61-0x66
|
abcdef
|
0
|
≠0
|
0
|
0
|
≠0
|
0
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≠0
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≠0
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0
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≠0
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0
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≠0
|
103-122 | 0x67-0x7A
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ghijklmnopqrstuvwxyz
|
0
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≠0
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0
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0
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≠0
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0
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≠0
|
≠0
|
0
|
≠0
|
0
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0
|
123-126 | 0x7B-0x7E
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{|}~
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0
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≠0
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0
|
0
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≠0
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≠0
|
0
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0
|
0
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0
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0
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0
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127 | 0x7F
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backspace character (DEL )
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≠0
|
0
|
0
|
0
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0
|
0
|
0
|
0
|
0
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0
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0
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0
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