Non-structured programming is the historically earliest programming paradigm capable of creating Turing-complete algorithms. It has been followed historically by procedural programming and then object-oriented programming, both of them considered as structured programming.
Unstructured programming has been heavily criticized for producing hardly-readable ("spaghetti") code and is sometimes considered a bad approach for creating major projects, but had been praised for the freedom it offers to programmers and has been compared to how Mozart wrote music.
There are both high- and low-level programming languages that use non-structured programming. These include early versions of BASIC (such as MSX BASIC and GW-BASIC), JOSS, FOCAL, MUMPS, TELCOMP, COBOL, machine-level code, early assembler systems (without procedural metaoperators), assembler debuggers and some scripting languages such as MS-DOS batch file language.
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... Non-structured languages allow only basic data types, such as numbers, strings and arrays (numbered sets of variables of the same type) ... The introduction of arrays into non-structured languages was a notable step forward, making stream data processing possible despite the lack of ...
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