Zilog Z80380 - Manual (Page 88)

Library Functions Run Time Environment
4–24 UM004001-COR1103
tolower, toupper FUNCTIONS
Header file statement: #include <ctype.h>
Syntax: int tolower ( int c );
int toupper ( int c );
The tolower and toupper routines macros convert a single character, as described below:
Function MacroDescription
tolower tolower Converts c to lowercase if appropriate
toupper toupper Converts c to uppercase if appropriate
The tolower routine converts c to lowercase if c represents an uppercase letter. Otherwise, c
is unchanged.
The toupper routine converts c to uppercase if c represents an lowercase letter. Otherwise,
c is unchanged.
Return Value
The tolower and toupper routines return the converted character c. There is no error returned.
Parameter Description
c Character to be converted