Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. BLooP and FLooP are simple programming languages designed by Douglas Hofstadter to illustrate a point in his book Godel, Escher, Bach. BLooP is a non-Turing-complete programming language whose only control flow structure is a bounded loop. This language can only express primitive recursive functions. FLooP is identical except that it supports unbounded loops; it is a Turing-complete language. These can be regarded as primitive models of computation.The only variables are output (the return value of the procedure) and cell(i) (an infinite array of integers). The only operators are <= (assignment), + (addition), x (multiplication), < (less-than), > (greater-than) and = (equals).

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