Putc Putchar Putw put character or word in a file #include <stdio.h> putc char ch FILE *fp putchar char ch putw int n FILE *fp Putc add the character "ch" to the file "fp" at the current writing position and advances the position pointer. Putchar is implemented as a macro (defined in the header file) and is equivalent to "putc(ch,stdout)". Putw adds the (two byte) machine word "n" to the file "fp" in the manner of putc. Output via putc is normally buffered except; (a) when the buffering is disabled by "setbuf()", and (b) the standard error output is always unbuffered. Putc and putchar return the character argument from a successful call, and EOF on end-of-file or error. fopen(), fclose(), fflush(), getc(), puts(), printf(), fread()