HP HP0-780 : NonStop Structured Query Language (SQL) Exam
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Exam Name : NonStop Structured Query Language (SQL)
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HP Language Dumps
Let’s start correct off with a controversial claim: Forth is the hacker’s programming language. Coding in Forth is a little bit like writing assembly language, interactively, for a strange CPU architecture that doesn’t exist. Forth is a virtual computing device, an interpreted command-line, and a compiler all in one. And all of here is fundamental enough that it’s readily able to operating in a couple of kilobytes of reminiscence. When your Forth code is right, it reads just like a herbal-language sentence however getting there comprises a bit of of mystery fixing.
From thinking FORTH (PDF)
Forth is what you’d get if Python slept with assembly Language: interactive, expressive, and with out syntactical baggage, however nevertheless very near the metallic. Is it a excessive-stage language or a low-level language? yes! Or somewhat, it’s the shortest direction from one to the different. that you may, and need to, peek and poke at once into reminiscence in Forth, however that you would be able to also construct up a physique of greater-stage code quickly satisfactory that you simply won’t intellect. individually, this aggregate of reside coding and proximity to the hardware makes Forth super for exploring new microcontrollers or working them into your initiatives. It’s a fun language to put in writing a hardware abstraction layer in.
however Forth is additionally like a high-wire act; if C offers you satisfactory rope to hang yourself, Forth is a flamethrower crawling with cobras. There is not any type checking, no scope, and no separation of records and code. which you can do horrible things like redefine 2 as a feature so that you can return seven, and invariably after your math won’t work. (however why would you?) you could quite simply start off into bad sections of memory and crash the device. you will develop an outstanding intellectual mannequin of what records is on the stack at any given time, or you will undergo. in case you need a compiler to fret about code protection for you, go see Rust, Ada, or Java. you are going to no longer locate it here. Forth is about simplicity and flexibility.
Being elementary and versatile also skill being extensible. nearly nothing is protected with most Forth techniques via default. if you like object-oriented vogue programming, for example, Gforth comes and not using a fewer than three distinctive object frameworks, and you get to select whichever suits your difficulty or your trend most reliable. which you can adjust the Forth compiler or interpreter itself, so if you desire type checking, that you can add it. Some Forth implementations are written with just twenty or thirty functions in native assembly or C, and the relaxation is bootstrapped in Forth. quicker Forths are implemented utterly in meeting language, with some bring together-time optimizations that make it run about as speedy as anything else, although it’s compiled as you category, on the target microcontroller itself.
Forth is doubtless no longer the language you wish to be trained if you're designing an business banking backend. nevertheless, a string of blinky LEDs operating a physics simulation isn’t an “commercial enterprise” anything else. Forth is a hacker’s language, in both the laudatory and the pejorative senses. I’m no longer bound that it’s going to aid you get “precise work” completed in any respect, and also you engineer forms may need to stroll away now. but if you are looking to tweak on the language itself, or use it to push your hardware round, or just play, Forth is amazing. The hacker in me thinks that’s a lot of fun, and it’s an outstanding match for smaller microcontroller initiatives.
Forth Crash course: concept part
Forth is the simplest language after assembly language. Forth is procedural within the extreme — a Forth program is in reality just a sequence of subroutines, called “phrases” in the Forth jargon. There’s no syntax, and all phrases are separated with the aid of a space and are parsed left to appropriate. With a number of exceptions for compiling, all phrases run at this time so the Forth interpreter doesn’t have to seem forward to the subsequent observe. run this code! is legitimate Forth in case you’ve already defined the phrases run, this, and code! and it calls each of the three phrases in the order that you’d expect.
Simplicity and Reverse Polish Notation
The corollary of this simple setup is that Forth uses the so-known as Reverse Polish Notation (RPN). If the Forth interpreter is going to execute the + observe at the moment, it has to have both numbers that are going to get delivered already on the stack. in any other case, it would ought to wait for the subsequent number to come alongside before it could finish the addition. read that again, and let it sink in. It’s distinct from what you’re used to, and it’s vital.
every other ordering or syntax is unnecessarily complicated. the style that you just consider of as “natural” to put in writing down math is loopy, within the feel that the look-ahead nature of the + operator requires either parentheses or an “order of operations” to be unambiguous. analyze 2 + 3 * 4. there is nothing herbal about getting 14 right here in any respect — it’s the outcomes of a convoluted syntax with implicit guidelines. You ought to study the complete “sentence” first, locate the *, bear in mind that it has precedence over +, evaluate it first, after which go back to the addition to finally end up, besides the fact that + is the 2nd word within the sentence. a computer doesn’t want to learn about “order of operations”, it just wants so as to add two numbers, preferably ones that are already sitting in ALU registers. Don’t believe me? study the machine code.
Forth, and RPN, write this as 2 three four * + or 3 4 * 2 +. either means, the operator works on something numbers are already available. if you don’t feel of this as being “reverse” or “polish” or even a “notation”, you’ll be on the right tune. You’re with ease writing things down within the order by which they should be performed. (How loopy is that!?!)
i like to consider of RPN because the computing equal of mis en location; earlier than you start cooking, you get all your parts lined up. this is the way Forth code works: get.broccoli chop.broccoli get.red meat slice.pork get.oyster-sauce stir.fry Some features are naturally interchangeable — you may get and slice the beef earlier than the broccoli — but the common order is essential to the procedure, and also you definitely don’t are looking to be going lower back to slice the broccoli while the red meat is within the wok. however this is exactly what you’re doing for those who insist on writing 3 + 4 as an alternative of three 4 +.
Compiling and running
New phrases are described and compiled with a : to enter compilation mode and a ; to exit. Compilation, such as it is, takes location automatically. below the hood, the Forth interpreter is asking up every note that you simply use within the definition and easily stringing them collectively. One exception to this rule is the characteristic identify itself, as you’ll see now.
collect your first Forth notice: : seven 3 4 + ;. It’s no longer very positive, nevertheless it creates a note known as seven as a way to put a 3 and a 4 on the stack after which run the addition note. The “outcomes” is that whatever you had on the stack before, you’ll have a 7 on accurate of it now. An optimizing Forth compiler will simply push a 7 onto the stack.
All programming is about breaking complex tasks down into cost effective-sized chunks. What constitutes “low-budget” depends a bit of on the language, a little bit on the programmer’s personal fashion, and a little on the cultural zeitgeist. Executing a notice in Forth requires a lot much less overhead than a function name in C, and following lengthy code logics can get convoluted even for skilled Forthers, so the definition of Forth words are typically extraordinarily brief, customarily one-liners including comments. You’ll be compiling quite frequently.
The coronary heart and soul of Forth is the records stack, henceforth “the stack”. Forth is a stack-based mostly language, and unless you’ve coded in Forth for a while, which you could’t admire what this really capacity and how strategies about the stack come to dominate your coding lifestyles. Forth words don’t take arguments or return values, as a substitute they function on whatever thing facts is on the stack once they’re known as.
The stack is the most suitable and worst part of Forth. When your stack contents line up correct with the phrases that operate on them, the outcome is code of a splendor and effectivity that may’t be beat. after they misalign, you find yourself questioning if the thing-oriented individuals aren’t appropriate, and that coupling records with methods could be a good idea after all.
The gimmick in Forth programming is identifying what’s necessary on the stack by using one observe, and making certain that the observe used simply formerly leaves that on the stack. during this feel, the Forth programmer defines phrases, but needs to believe in phrases, the place the contents of the stack start out empty and end that way once again. this is like the approach that C uses the stack inside a characteristic scope, protecting the local variables most effective unless it’s done with the feature, and then overwriting them.
As a concrete instance of this chaining, think about a word, gpio-set that sets a GPIO pin excessive. it is going to doubtless need each a port and a pin quantity to get the job completed. a particularly Forthy approach to implement here's to outline a observe for each pin on the half that you simply’re going to make use of: : PA3 PORTA 3 ; Then you could gentle the LED on pin A3 with PA3 gpio-set. In C, you’d first define a constitution that contains a port and a pin quantity, then outline gpio-set to take a structure of that classification. In Forth, here's implicit: you be sure that the pin phrases push a port and pin quantity onto the stack, after which that pin-dealing with words are expecting them. It’s now not safe, however’s fundamental.
Swap-swap, the Forth Mascot, from starting FORTH
The fully worst a part of Forth is stack manipulations. people continually start researching Forth by learning in regards to the stack manipulations, and certainly they are crucial, however they’re trivial. words like swap, drop, and dup let you circulate objects around on the stack, but too many “stack juggling” manipulations in a given word is probably a sign of unhealthy Forth code, rather than decent. You’ll use these words for certain, but that’s no longer the place the bodies are buried.
rather, the stack is the place the absolute minimal quantity of information desires to sit down between processing steps. The variety of gadgets needs to be small sufficient to keep away from operating out of finite stack area, of route. however a second cause is that it’s comfortably hard to keep too many stack items straight to your mind. As you get used to Forth, the quantity of stack for you to internalize might go up from three gadgets to five or seven, but you’re going to get at a loss for words if you let the stack develop unpruned for long.
So Forth is a disaster. It’s a language where you must control the stack your self, and the simplest hope of no longer getting caught in a tangled net of infinite stack juggling is to hold issues as simple as viable. Forth proponents would claim that here's additionally its optimal virtue — there’s all the time drive to retain things standard and simple as a result of doing anything else will embed un-figure-outable bugs so deep into your code that you’ll go mad. I don’t be aware of if it’s Stockholm syndrome, no matter if I’m a minimalist at coronary heart, or whether i love the challenge, but this is truly one of the crucial motives that Forth is so neat.
different programming languages will let you juggle tens of variables since the compiler continues music of distinct scopes for you, holding music of how deep each and every (local) variable is on the stack. Forth doesn’t. And that capability that you just deserve to think about the order wherein things run. Forth forces you to internalize just a little of optimization that a great compiler would do for you. this can grow to be in very tight code, or in headaches. It is dependent upon the programmer and the difficulty.
In my experience, fundamental syntax, desktop-friendly ordering, and the ensuing emphasis on transparency and ease make it really incredibly handy to get stuff right in Forth.
The sweet Spot
however enough philosophical crap about Forth. in case you need that, that you could read it in different places in copious quantities. (See the word list under.) There are three motives that Forth more enjoyable to the hardware hacker presently than ever earlier than. the first purpose is that Forth changed into developed for the computer systems of the late Seventies and early Eighties, and this degree of vigor and class is just about what you find in each $3 microcontroller in the marketplace right now. The different two explanations are intertwined, but revolve around one selected Forth implementation.
There are a million Forths, and each one is a unique snowflake. We’ve covered Forth for the AVRs, Forth on hands, and most currently Forth on an ESP8266. The shaggy dog story goes that if you’ve viewed one Forth implementation, you’ve considered one Forth implementation. but I believe that’s too cynical — Forth is as tons a method of pondering concerning the computing device programming difficulty because it is a selected implementation. once you be trained one, you’ll be on first rate footing to gain knowledge of any other.
Anyway, just a few years in the past, a physics graduate pupil [Matthias Koch] wrote a Forth for the MSP430 as a result of he essential a microcontroller to compile analog information for an test. That’s “Mecrisp”. afterward, he crucial more speed and re-wrote it for the ARM Cortex M household of chips, and they obtained “Mecrisp-Stellaris“.
And that’s the place things acquired stunning. [Jean-Claude Wippler], the “J” in JeeLabs, determined that he became going to implement his new gadget of distributed electrical and environmental sensors in Forth, as a minimum under the hood. To do that, he crucial a hardware abstraction layer. The mixture of Mecrisp-Stellaris with the JeeLabs libraries is a big Forth ecosystem for a whole bunch of ARM microcontrollers, and it has all been developed in the closing two years by means of a small core of thoughtful hackers. Combining the two gives a really pleasurable Forth microcontroller hacking adventure, like a peculiar interactive Arduino.
So if you need to comply with along down a extremely ordinary rabbit hole, be trained somewhat concerning the true hacker’s programming language, or simply idiot round, dwell tuned. In a few weeks, I’ll put up a palms-on e book to getting started with Mecrisp-Stellaris on the STM32 family ARM chips.
These are the droids you’re trying to find.
a very good minimum Mecrisp-Stellaris building atmosphere is going to include an inexpensive STM32F103 development board, a ST-link v2 (or greater) programmer for it, and a USB-TTL serial adapter. chances are respectable that you just’ve obtained at the least the latter kicking round already. if so, you can be set up with the relaxation for round $10, €10, or £10 depending on the place you live. “STM32F103” and “ST-link” should still get you installation on eBay.
So order some constituents right now. whilst you’re anticipating beginning, work through this very first rate online tutorial. Run through that, and also you’ll be set for next time.
if you are looking to go extra, which you can download a Forth to your computer computer and start working via any other introductions. Brodie’s “beginning FORTH” is the canonical Forth introduction, but it surely’s slightly dated (and believe free to skip Chapter 3 on disk access). in case you select brevity over humor, check out J.V. Noble’s newbie’s guide or the Gforth tutorial.
All photographs from beginning FORTH used by way of permission from FORTH, Inc. The originals are black and white, in preference to Hackaday dark charcoal and yellow, naturally.