Zilog ZUSBOPTS Bedienungsanleitung PDF herunterladen (Seite 430)

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101

Standard Header Files UM017105-0511

402

Zilog Developer Studio II – ZNEO™

User Manual

Variable Argument List Access Macros and Function

The va_start and va_arg macros described in this section are implemented as macros, not

as real functions. If

#undef is used to remove a macro definition and obtain access to a

real function, the behavior is undefined.

Functions

Input/Output <stdio.h>

The <stdio.h> header declares input and output functions.

Macro

Functions

Formatted Input/Output

Character Input/Output

void va_start(va_list ap, parmN); Sets pointer to beginning of argument list.

type va_arg (va_list ap, type); Retrieves argument from list.

void va_end(va_list ap); Resets pointer.

EOF Expands to a negative integral constant. Returned by functions to indi-

cate end of file.

int printf(const char *format, ...); Writes formatted data to stdout.

int scanf(const char *format, ...); Reads formatted data from stdin.

int sprintf(char *s, const char *format, ...); Writes formatted data to string.

int sscanf(const char *s, const char *format, ...); Reads formatted data from string.

int vprintf(const char *format, va_list arg); Writes formatted data to a stdout.

int vsprintf(char *s, const char *format, va_list arg); Writes formatted data to a string.

int getchar(void); Reads a character from stdin.

char *gets(char *s); Reads a line from stdin.

int putchar(int c); Writes a character to stdout.

int puts(const char *s); Writes a line to stdout.

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