5.0. Stream Input and Output And the streams thereof shall be turned into pitch Isaiah 33:21 For every one that asketh receivedth; and he that seeketh findth; and to him that knocketh it shall be opened. Matthew 7:8 This chapter treats the topic of input from and output to streams using the built-in functions. An overview of the other parts of the input/output (I/O) system is also given but not discussed in detail. At the end of the chapter there are sections containing implementation-specific information for this topic.