getc - get byte from stream

Syntax	#include <stdio.h> int getc(FILE *stream);
Description	The getc() function is equivalent to fgetc(), except that if it is implemented as a macro it may evaluate stream more than once, so the argument should never be an expression with side effects. getc() is defined both as a function and as a macro. getc(stdin) is identical to getchar(). The getc_unlocked() function is functionally equivalent to getc() except that it is not implemented as a thread-safe function. For this reason, it can only be safely used in a multithreaded program if the thread that calls it owns the corresponding (FILE *) object. This is the case after successfully calling the flockfile() or ftrylockfile() functions.
Return val.	See fgetc().
Errors	See fgetc().
Notes	See fgetc().
See also	fgetc(),  putc(), putchar_unlocked(), stdio.h.