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Input/output in high level programming languages

A system's input/output is its communication with the other systems in its environment. By viewing the relationship as communication between partners, we identify the fundamental requirements in input/output programming, and discuss the responses of various programming languages to these requirements. Traditional programming languages provide either nothing or an expensive incomplete solution. The new languages Modula and Ada now offer major improvements in this area. We describe the style of their solutions, and give corresponding guidance for low‐level input/output programming.