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A-0 (or A0) is a programming language for the UNIVAC I or II, using three-address code instructions for solving mathematical problems. A-0 was the first language for which a compiler was developed. It was produced by Grace Hopper's team at Remington Rand in 1952. Later internal versions were A-1, A-2, A-3, AT-3. A-3 was released as ARITH-MATIC; AT-3 was released as MATH-MATIC.

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The A-2 Compiler System, Rem Rand, 1955.
PROGRAMMING LANGUAGES: History and Fundamentals, Sammet 1969, p. 12

This article (or an earlier version of it) contains material from
FOLDOC, used with permission.

For "A0" the ISO 216 specification for paper, see paper size.