putc, putchar, fputc, putw - put character or word on a stream
int putc(c, 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.