isupper, iswupper, _ismbcupper
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Header File
ctype.h, wctype.h, mbstring.h
Category
Classification Routines
Prototype
int isupper(int c);
int iswupper(wint_t c);
int _ismbcupper(unsigned int c);
Description
Tests for uppercase character.
isupper is a macro that classifies ASCII-coded integer values by table lookup. The macro is affected by the current locale's LC_CTYPE category. For the default C locale, c is an uppercase letter (A to Z).
You can make this macro available as a function by undefining (#undef) it.
Return Value
isupper returns nonzero if c is an uppercase letter.
Example
#include <stdio.h> #include <ctype.h> int main(void) { char c = 'C'; if (isupper(c)) printf("%c is an uppercase character\n",c); else printf("%c is not an uppercase character\n",c); return 0; }
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
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isupper |
+ |
+ |
+ |
+ |
_ismbcupper |
+ |
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iswupper |
+ |
+ |
+ |