CPL, intended primarily as a systems programming language, particularly for writing compilers; it was first implemented in 1967, prior to CPL's first implementation. BCPL then led, via B, to the popular and influential C programming language.

Example

The function MAX as formulated by Peter Norvig:

Max(Items, ValueFunction) = value of§ (Best, BestVal) = (NIL, -?)while Items do §(Item, Val) = (Head(Items), ValueFunction(Head(Items)))if Val > BestVal then (Best, BestVal) := (Item, Val)Items := Rest(Items) ̸§result is Best ̸§

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