ABL electronic PIC Microcontrollers PIC16 - Manual (Page 292)

mikroC - C Compiler for Microchip PIC microcontrollers
mikroC
making it simple...
284
MikroElektronika: Development tools - Books - Compilers
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Prototype char isxdigit(char character);
Description Function returns 1 if the
character
is a hex digit (0-9, A-F, a-f), otherwise returns
zero.
isxdigit
Prototype
char toupper(int character);
Description If the
character
is a lowercase letter (a-z), function returns an uppercase letter.
Otherwise, function returns an unchanged input parameter.
toupper
Prototype char tolower(int character);
Description If the
character
is an uppercase letter (A-Z), function returns a lowercase letter.
Otherwise, function returns an unchanged input parameter.
tolower
Prototype char isupper(char character);
Description Function returns 1 if the
character
is an uppercase letter (A-Z), otherwise returns 0.
isupper