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Plankalkül

Plankalkül (ˈplaːn.kal.kyːl, German, "Plan Calculus") is a computer language developed for engineering purposes by Konrad Zuse. It was the first high-level non-von Neumann programming language to be designed for a computer and was designed between 1943 and 1945. Also, notes survive with scribblings about such a plan calculation dating back to 1941. Plankalkül was not published at that time owing to a combination of factors such as conditions in wartime and postwar Germany and his efforts to commercialise the Z3 computer and its successors. By 1946 Zuse had written a book on the subject but this remained unpublished. In 1948 Zuse published a paper about the Plankalkül in the "Archiv der Mathematik" but still did not attract much feedback - for a long time to come programming a computer would only be thought of as programming with machine code. The Plankalkül was eventually more comprehensively published in 1972 and the first compiler for it was implemented in 1998. Another independent implementation followed in the year 2000 by the Free University of Berlin.
The German term "Kalkül" means formal system – the Hilbert-style deduction system is for example originally called "Hilbert-Kalkül", so Plankalkül means "formal system for planning".

Description

Plankalkül drew comparisons to APL and relational algebra. It includes assignment statements, subroutines, conditional statements, iteration, floating point arithmetic, arrays, hierarchical record structures, assertions, exception handling, and other advanced features such as goal-directed execution.

The example below shows a program which computes the maximum of three variables by calling the function max :

`P1 max3 (V0[:8.0],V1[:8.0],V2[:8.0]) => R0[:8.0]`
`max(V0[:8.0],V1[:8.0]) => Z1[:8.0]`
`max(Z1[:8.0],V2[:8.0]) => R0[:8.0]`
`END`
`P2 max (V0[:8.0],V1[:8.0]) => R0[:8.0]`
`V0[:8.0] => Z1[:8.0]`
`(Z1[:8.0] < V1[:8.0]) -> V1[:8.0] => Z1[:8.0]`
`Z1[:8.0] => R0[:8.0]`
`END`

Plankalkül shared an idiosyncratic notation using multiple lines with Frege's Begriffsschrift of 1879 (dealing with mathematical logic).

Quotations

In a lecture in 1957 Zuse mentioned his hope that the Plankalkül "after some time as a Sleeping Beauty, will yet come to life."

Heinz Rutishauser, one of the founders of ALGOL:

"The very first attempt to devise an algorithmic language was undertaken in 1948 by K. Zuse. His notation was quite general, but the proposal never attained the consideration it deserved."