When to Make Something a Procedure in Visual Studio .NET

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When to Make Something a Procedure
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The single most important purpose of procedures is to manage complexity in your programs by replacing a sequence of machine instructions with a descriptive name This might hardly seem to the point in the case of the Write procedure, which contains only two instructions apart from the structurally necessary RET instruction True But the Writeln procedure hides two separate calls to Write behind itself: one to display the string, and another to return the cursor to the left margin of the next line The name Writeln is more readable and descriptive of what the underlying sequence of instructions does than the sequence of instructions itself
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Extremely simple procedures such as Write don't themselves hide a great deal of complexity They do give certain actions descriptive names, which is valuable in itself They also provide basic building blocks for the creation of larger and more powerful procedures, as we'll see later on And those larger procedures will hide considerable complexity, as you'll soon see In general, when looking for some action to turn into a procedure, see what actions tend to happen a lot in a program Most programs spend a lot of time displaying things to the screen Such procedures as Write and Writeln become general-purpose tools that may be used all over your programs Furthermore, once you've written and tested them, they may be reused in future programs as well without adding to the burden of code that you must test for bugs Try to look ahead to your future programming tasks and create procedures of general usefulness I show you more of those by way of examples as we continue, and tool building is a very good way to hone your assembly language skills On the other hand, a short sequence (5 to 10 instructions) that is only called once or perhaps twice within a middling program (that is, over hundreds of machine instructions) is a poor candidate for a procedure You may find it useful to define large procedures that are called only once when your program becomes big enough to require breaking it down into functional chunks A thousand-line assembly language program might split well into a sequence of 9 or 10 largish procedures Each is only called once from the main program, but this allows your main program to be very indicative of what the program is doing: Start: call call Input: call call call loop call call call Initialize OpenFile GetRec VerifyRec WriteRec Input CloseFile CleanUp ReturnToDOS
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This is clean and readable and provides a necessary view from a height when you begin to approach a thousand-line assembly language program Remember that the Martians are always hiding somewhere close by, anxious to turn your program into unreadable hieroglyphics There's no weapon against them with half the power of procedures
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Using BIOS Services
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In the last chapter we looked closely at DOS services, which are accessed through the DOS services dispatcher The DOS dispatcher lives at the other end of software interrupt 21H and offers a tremendous list of services at the disposal of your programs There's another provider of services in your machine that lives even deeper than DOS: the ROM BIOS ROM is an acronym for read-only memory, and it indicates memory chips whose contents are burned into their silicon and do not vanish when power is turned off BIOS is an acronym for Basic Input/Output System, and it is just that: a collection of fundamental routines for dealing with your computer's input and output peripherals These include disk drives, displays, printers, and the like DOS uses BIOS services as part of some of the services that it provides Like DOS, BIOS services are accessed through software interrupts Unlike DOS, which channels nearly all requests for its services through the single interrupt 21H, BIOS uses numerous interrupts (about 10) and groups similar categories of services beneath the control of different interrupts For example, video display services are accessed through interrupt 10H, keyboard services come through interrupt 16H, printer services through interrupt 17H, and so on The overall method for using BIOS services, however, is very similar to that of DOS You load a service number and sometimes other initial values into the registers and then execute an INT <n> instruction, where the n depends on the category of services you're requesting Nothing difficult about that at all Let's start building some tools
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