Scientific Operations



PUTCHAR(III)                 5/10/73                 PUTCHAR(III)



NAME
     putchar, flush - write character

SYNOPSIS
     putchar(ch)

     flush( )

DESCRIPTION
     Putchar  writes  out  its argument and returns it unchanged.
     Only the low-order byte is written, and only if it  is  non-
     null.   Unless  other  arrangements  have been made, putchar
     writes in unbuffered fashion on the standard output file.

     Associated with this routine is an  external  variable  fout
     which  has  the  structure  of a buffer discussed under putc
     (III).  If the file descriptor part of this structure (first
     word) is greater than 2, output via putchar is buffered.  To
     achieve buffered output one may say, for example,

          fout = dup(1);      or
          fout = creat(...);

     In such a case flush must be called before the program  ter-
     minates  in  order  to flush out the buffered output.  Flush
     may be called at any time.

SEE ALSO
     putc(III)

BUGS
     The fout notion is kludgy.

























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