Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 2. Compiler reference

See Locale, page 71.

The number of bits in a character is represented by the manifest constant 

CHAR_BIT

. The 

standard include file 

limits.h

 defines 

CHAR_BIT

 as 8.

The mapping of members of the source character set (in character and string literals) to 
members of the execution character set is made in a one-to-one way. In other words, the 
same representation value is used for each member in the character sets except for the 
escape sequences listed in the ISO standard.

The value of an integer character constant that contains a character or escape sequence 
not represented in the basic execution character set or in the extended character set for 
a wide character constant generates a diagnostic message, and will be truncated to fit the 
execution character set.

An integer character constant that contains more than one character will be treated as an 
integer constant. The value will be calculated by treating the leftmost character as the 
most significant character, and the rightmost character as the least significant character, 
in an integer constant. A diagnostic message will be issued if the value cannot be 
represented in an integer constant.

A wide character constant that contains more than one multibyte character generates a 
diagnostic message.

The only locale supported—that is, the only locale supplied with the IAR C/C++ 
Compiler—is the ‘C’ locale. If you use the command line option 

--enable_multibytes

, the IAR DLIB Library will support multibyte characters if 

you add a locale with multibyte support or a multibyte character scanner to the library. 
The IAR CLIB Library does not support multibyte characters.

See Locale, page 71.

A ‘plain’ 

char

 has the same range as an 

unsigned

 

char

.