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Module: IO
Function: hPutChar
Type: Handle -> Char -> IO ()
Description: hPutChar hdl c writes the character c to the file or channel managed by hdl. Characters may be buffered if buffering is enabled for hdl.
Related: hGetChar, hGetContents, hGetLine, hPrint, hPutStr, hPutStrLn

Example 1
Program source: 

import IO
import Char

main =  do hdl <- openFile  "/tmp/foo.txt" WriteMode
	   hPutChar hdl (chr 66)
	   hPutChar hdl ("ABCD" !! 0)
	   hClose hdl
	   hdl <- openFile  "/tmp/foo.txt" ReadMode
	   x <- hGetContents hdl
	   putStr x

Output: BA