Zilog Z80380 Manual do Utilizador descarregar pdf (Página 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

Character to be converted

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