Buffer cont.

• Similar on output.

  • 1 byte at a time from program to buffer.
  • 512 bytes from buffer to disk in one transfer.

• Clearing the output buffer to make room for new output from the progam is called “flushing the buffer”

• Normally flushing of an input buffer happens when you hit “enter”.

• Normally flushing of an output buffer happens when you process “new line” \n

• Can happen at unexpected times.

• Old C : fflush(stdout)

• C++ : osobj.flush( )