Structured Programming Using Turbo BASIC

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Are you sure you want to delete this list? Remove them from Saved? No Yes. Prior to the s, language development was often constrained by hardware, and memory specifications. The advent of standardized platforms such as the based system, had made languages easier to implement, and spread.

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By the s, structured programming had become the new norm. The largest change was the introduction of OO, or object-oriented programming. Although the ideology had first revealed itself in Simula, way back in , data evolved into objects. Smalltalk 80 was the first major development along the OO path in the s although Smalltalk itself appeared in Ada was named after Ada Lovelace , who is often credited with being the first computer programmer.

Structured programming using Turbo BASIC /

Ada was originally targeted at embedded and real-time systems, and is still commonly used for those purposes. It was targeted at embedded, and real-time systems. Because Ada is a stongly-typed language, it has been used outside the military in commercial aviation projects, where a software bug can mean fatalities.

The fly-by-wire system in the Boeing runs software written in Ada.

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In Larry Wall developed Perl Practical Extraction and Reporting Language , because the text manipulation tools available such as sed and awk were not strong enough. It has very strong text matching functions.


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The s also saw the popularity of some languages increase through the family of Turbo languages produced by Borland. While Pascal had gone mainstream at least for teaching purposes , Niklaus Wirth introduced Modula, its apparent successor in A number of ports to different versions of DOS became available. The most notable feature of Turbo-Basic was its dramatically improved speed; an unmodified Atari BASIC program loaded into Turbo-Basic would normally run three to five times faster, and this would improve as the program size grew.

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A simple improvement was to compare the line number to the line it was found in; if the GOTO line number was larger, the interpreter would only search forward from that spot, if it was smaller, it would search from the start of the program MS BASIC included a pointer to the next instruction, but not previous. For programs that did significant looping, which is often the case in BASIC, this could represent a dramatic performance hit.

Line numbers were sent into a hash function that broke them into line chunks. As the program was entered, the address of the first of each of these chunks was stored in a value table. At runtime, when a line number lookup was needed, it would first pick the nearest-but-lower value in the table, retrieve the address, and then begin scanning for the line from that point.

The improvement was most notable in larger programs where the scanning time was increasingly expensive, which is why Turbo-Basic could hit a 5-times increase on larger programs.

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