toascii, tolower, _tolower, toupper,

Convert single characters.

#include <ctype.h>

int toascii (int c);

int tolower (int c);

int _tolower (int c);

int toupper (int c);

int _toupper (int c);

Parameters

c: Character to convert.

Remarks

These functions are implemented both as functions and as macros. To use the function versions, remove the macro definitions through #undef directives, or do not include CTYPE.H.

Function	Description
toascii	Converts `c` to ASCII character. toascii sets all but the low-order 7 bits of `c` to 0, so that the converted value represents an ASCII character. If `c` already represents an ASCII character, `c` is unchanged.
tolower	Converts `c` to lowercase if `c` represents an uppercase letter.
_tolower	Converts `c` to lowercase only when `c` represents an uppercase letter; the result is undefined if `c` is not.
toupper	Converts `c` to uppercase if `c` represents a lowercase letter.
_toupper	Converts `c` to uppercase only when `c` represents a lowercase letter; the result is undefined if `c` is not.

Return Values

The converted character.: Success.
No error return.: Failure.

Requirements

Versions	Defined in	Include	Link to
INtime 3.0	intime/rt/include/ctype.h	ctype.h	clib.lib

Parameters

Remarks

Return Values

Requirements

See Also