A-0 gilt als der erste Compiler der Computergeschichte. Er wurde 1951 bis 1952 von Grace Hopper für die UNIVAC I entwickelt. A-0 ermöglichte die Übersetzung von mathematischen Zeichen in Maschinensprache. Grace Hopper speicherte alle von ihr geschriebenen Funktionen auf einem Band und teilte dann jeder einzelnen eine Aufrufadresse zu. Es kam zu Weiterentwicklungen, die als A-1 und A-2 bekannt wurden. Dieser erste Compiler ebnete den Weg zu den bekannten Hochsprachen und war der Vorgänger von FLOW-MATIC.

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