Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 481)

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101

UM017105-0511 Standard Functions

Zilog Developer Studio II – ZNEO™

User Manual

453

Synopsis

#include <ctype.h>

int tolower(int c);

Returns

If the argument is an uppercase letter, the tolower function returns the corresponding

lowercase letter, if any; otherwise, the argument is returned unchanged.

Example

char c='A';

int i;

i=tolower(c);

toupper

Converts a lowercase letter to the corresponding uppercase letter.

Synopsis

#include <ctype.h>

int toupper(int c);

Returns

If the argument is a lowercase letter, the toupper function returns the corresponding

uppercase letter, if any; otherwise, the argument is returned unchanged.

Example

char c='a';

int i;

i=toupper(c);

va_arg

Expands to an expression that has the type and value of the next argument in the call. The

parameter

ap is the same as the va_list ap initialized by va_start. Each invocation of

va_arg modifies ap so that successive arguments are returned in turn. The parameter type

is a type name such that the type of a pointer to an object that has the specified type can be

obtained simply by fixing a * to type. If type disagrees with the type of the actual next

argument (as promoted, according to the default argument conversions, into

int, unsigned

int, or double), the behavior is undefined.

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