The latest version of this topic can be found at _ismbclower, _ismbclower_l, _ismbcupper, _ismbcupper_l.
Checks whether a multibyte character is lowercase or uppercase.
Important
This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.
Syntax
int _ismbclower(  
   unsigned int c   
);  
int _ismbclower_l(  
   unsigned int c,  
   _locale_t locale   
);  
int _ismbcupper(  
   unsigned int c   
);  
int _ismbcupper_l(  
   unsigned int c,  
   _locale_t locale  
);  
Parameters
c
Character to be tested.
locale
Locale to use.
Return Value
Each of these routines returns a nonzero value if the character satisfies the test condition or 0 if it does not. If c<= 255 and there is a corresponding _ismbb routine (for example, _ismbcalnum corresponds to _ismbbalnum), the result is the return value of the corresponding _ismbb routine.
Remarks
Each of these functions tests a given multibyte character for a given condition.
The versions of these functions with the _l suffix are identical except that they use the locale passed in instead of the current locale for their locale-dependent behavior. For more information, see Locale.
| Routine | Test condition | Code page 932 example | 
|---|---|---|
_ismbclower | 
Lowercase alphabetic | Returns nonzero if and only if c is a single-byte representation of an ASCII lowercase English letter: 0x61<=c<=0x7A. | 
_ismbclower_l | 
Lowercase alphabetic | Returns nonzero if and only if c is a single-byte representation of an ASCII lowercase English letter: 0x61<=c<=0x7A. | 
_ismbcupper | 
Uppercase alphabetic | Returns nonzero if and only if c is a single-byte representation of an ASCII uppercase English letter: 0x41<=c<=0x5A. | 
_ismbcupper_l | 
Uppercase alphabetic | Returns nonzero if and only if c is a single-byte representation of an ASCII uppercase English letter: 0x41<=c<=0x5A. | 
Requirements
| Routine | Required header | 
|---|---|
_ismbclower | 
<mbstring.h> | 
_ismbclower_l | 
<mbstring.h> | 
_ismbcupper | 
<mbstring.h> | 
_ismbcupper_l | 
<mbstring.h> | 
For more compatibility information, see Compatibility.
.NET Framework Equivalent
See Also
Character Classification
_ismbc Routines
Locale
Interpretation of Multibyte-Character Sequences
is, isw Routines
_ismbb Routines