getc, getchar, fgetc, getw - get character or word from stream
Getc returns the next character from the named input stream.
Getchar() is identical to getc(stdin).
Fgetc behaves like getc, but is
a genuine function, not a macro; it
may be used to save object text.
Getw returns the next int from
the named input stream. It returns
the constant EOF upon end of file or error, but since that is a
good integer value, feof and ferror(3) should be used to check the
success of getw. Getw assumes no special alignment in the file.
clearerr(3), fopen(3), putc(3), gets(3), scanf(3), fread(3),
These functions return the integer constant EOF at end of file,
upon read error, or if an attempt is made to read a file not opened
by fopen. The end-of-file condition is remembered, even on a
terminal, and all subsequent attempts to read will return EOF until
the condition is cleared with clearerr(3).
Because it is implemented as a macro, getc treats a stream argument
with side effects incorrectly. In particular, ‘getc(*f++);’
doesn’t work sensibly.