3.81 isupper

Function

Check if a given character is an upper case letter.

Header

ctype.h

Declaration

int __fastcall__ isupper (int c);

Description

The function returns a non zero value if the given argument is an upper case letter. The return value is zero if the character is anything else.

Limits

• When compiling with -Os the function is actually a macro. The inline sequence generated by the macro will not work correctly for values outside the range 0..255. Note: The constant EOF is not part of this range. The non inline function may be accessed by #undef'ing the macro.
• When compiling without -Os, the function is only available as fastcall function, so it may only be used in presence of a prototype.

Availability

ISO 9899

See also

isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isxdigit

Example

None.