putc, putchar, fputc, putw - put character or word on a stream
int putc(int c, FILE *stream)
int putchar(int c)
int fputc(int c, FILE *stream)
int putw(int w, FILE *stream)
Putc appends the character c to the named output stream. It returns the
Putchar(c) is defined as putc(c, stdout).
Fputc behaves like putc, but is a genuine function rather than a macro.
Putw appends word (that is, int) w to the output stream. It returns the
word written. Putw neither assumes nor causes special alignment in the
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, ferror(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
Errors can occur long after the call to putc.