A program expression ( english listing ) is a printed list of computer instructions, usually in the form of a computer program or computer data. It is printed in a human -readable form (usually numbers and letters series).
In particular, appeared in the 1980s in computer game magazines and books often program listings for typing, mostly in BASIC or Assembler, sometimes for several home computer systems. The first successful such book was 1978 Basic Computer Games ( in German BASIC Computer Games, edited by David H. Ahl (Creative Computing). Books published in Germany in 1982 Sybex publishing.
Formerly a program term was used primarily for error correction. Usual was the expression on continuous paper. Due to the better options for the screen display this kind of use has declined. Today, we used the program prints mainly for training or to a specific situation to publish.