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Unix Version 7 - man page for putc (v7 section 3S)

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PUTC(3S)										 PUTC(3S)

       putc, putchar, fputc, putw - put character or word on a stream

       #include <stdio.h>

       int putc(c, stream)
       char c;
       FILE *stream;


       fputc(c, stream)
       FILE *stream;

       putw(w, stream)
       FILE *stream;

       Putc  appends  the character c to the named output stream.  It returns the character writ-

       Putchar(c) is defined as putc(c, stdout).

       Fputc behaves like putc, but is a genuine function rather than a macro.	It may be used to
       save on object text.

       Putw  appends word (i.e.  int) w to the output stream.  It returns the word written.  Putw
       neither assumes nor causes special alignment in the file.

       The standard stream stdout is normally buffered if and only if the output does  not  refer
       to a terminal; this default may be changed by setbuf(3).  The standard stream stderr is by
       default unbuffered unconditionally, but use of freopen (see fopen(3))  will  cause  it  to
       become buffered; setbuf, again, will set the state to whatever is desired.  When an output
       stream is unbuffered information appears on the destination file or terminal  as  soon  as
       written;  when it is buffered many characters are saved up and written as a block.  Fflush
       (see fclose(3)) may be used to force the block out early.

       fopen(3), fclose(3), getc(3), puts(3), printf(3), fread(3)

       These functions return the constant EOF upon error.  Since this is a  good  integer,  fer-
       ror(3) should be used to detect putw errors.

       Because	it  is	implemented  as  a macro, putc treats a stream argument with side effects
       improperly.  In particular `putc(c, *f++);' doesn't work sensibly.

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