isupper, iswupper, _ismbcupper

Remonter à Ctype.h - Index

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++
isupper	+	+	+	+
_ismbcupper		+
iswupper		+	+	+