Why is the first program a programmer writes "Hello world!"

《 Trisomy 》 There are a lot of people in the novel “ Tiger body one earthquake ” The concept of , For example, this “ Dimension reduction blow ” The concept of . In the novel , The singer threw a... At the solar system “ Two way foil ”, Then the three-dimensional solar system suddenly became a two-dimensional world ……

This is the plot of the novel , And in real life , We have a lot of similar “ Dimension reduction blow ” What happened .

I said, “ Programmers write code ” Is a “ Dimension reduction blow ” What happened , Or more to say “ Dimension reduction creation ” What happened , Do you believe ？

Have you ever thought about it , Why most of the first programs programmers write are output ：

“Hello, World!”

instead of “Hello, Kitty!”, Neither “Hello, Program!”？

It looks like “ Ancestral tradition ”, But I think it has a special meaning .

We write code , Is creating a world .

Programmers touch the world , The first thing is to the world Say Hello.

Maybe you think I'm blowing water , Even nonsense .

If you are an Embedded Software Engineer , You will know , Basically all the contents in the chip have an address , One dimensional .

Loaded running program , lie in Flash or ROM in , Is a linear space , Each byte has a unique address ; Where the dynamic variable is located RAM It also has an address ; even to the extent that MCU Internal registers , It also has an address .

not only MCU The space inside is one-dimensional , You write programs in one dimension , Every function that runs , Each line of code , Even every one byte All have unique addresses .

Many engineers who do application software development , I don't know the address that can be operated directly , For example, the following code , I can see that they are stunned ：

#define MPU_CTRL 0xE002ED94
*(uint32_t*)MPU_CTRL |= 0x00002000;

What I want to say is , This is a one-dimensional world .

You write code to build this one-dimensional world , It can also be understood that , This is a “ Dimension reduction creation ”.

Think about it like this , Programmers are really an awesome and noble profession .

You hold on , Don't spray yet , I know you've been working as a programmer , There are thousands of grass and mud horses running inside , Every minute I want to delete the database and run away .

other ！“ Delete the library and run away ” Is a “ Dimension reduction blow ” What happened , Now let's talk about “ Dimension reduction creation ”！

Think , What did you do as a programmer for ？ I think , Most of them are probably curious about software , It's a very interesting thing , You can do many amazing things .

therefore , Remain true to our original aspiration , To continue this great cause ！

Come back to , Go on to the one-dimensional world of embedded software .

above-mentioned , All target objects in embedded software , Almost all have addresses , It's like living in a one-dimensional world .

Every step of the program , It's like driving the world around .

Step by step , The world is very stable , Follow your every command .

In limine , You carefully let it go step by step , Feel its magical start ;

later , You try to jump in many steps , Experience the pleasure it brings ;

later , You dare try to make it fly , Very exciting ！

then , You find it's taking too big a step , Easy to pull eggs .

The pointer , Make you happy and worry ！

At this time , You have experienced C The pointer to language , It's a magical thing ,C Language will be eclipsed without pointers , Pointer , And let the world you created be full of countless frustrations ——bug！

Actually , That's not the reason you roast . And those who stink of copper “ Bosses ”, Say this and that to you proudly , From time to time “ The great leap forward ” The idea of the project to sprint the progress of the project , It makes you sick .

therefore , After a long time , The heart begins to breed “ fuck you ”. This is a later story , This article does not discuss this .

Now? , You believe what I say “ Programmers write code ” Is a “ Dimension reduction creation ” It's over , Someone is upset about the boss , Just think about it for a minute “ Delete the library and run away ” Such dimensionality reduction attacks , But the one-dimensional world is innocent .

Some people are upset , He is distorting the one-dimensional world he created , Write a bunch of shitty code .

So many people later , Don't like “ ancestral ” Code for , ha-ha ！

Low dimensional creation of the world , It came too soon , It is very slow to show the rules of creating the world .

even to the extent that , Programmers also create chains of disdain .

Many people often ignore coding rules , I also don't like the design method of those rules .

Self programmer , The world created is usually mediocre , Thought is also stagnant .

Programmers need to keep learning . Stagnant programmers are easily eliminated .

Okay , Maybe you'll ask , Why is the world created by programmers “ A one-dimensional ” Of , It's not two-dimensional , The three-dimensional , Even four-dimensional .

What I'm talking about is , Program operation and basic hardware space , Itself is one-dimensional , But you can abstract out two dimensions , A three-dimensional or even four-dimensional world , For example, flat display , 3D animation, etc , These should be considered by human senses , But from this point of view , No problem .

Think again ！ A lot of people are worried about , Will our human world be occupied or even ruled by artificial intelligence .

Maybe , Once AI has ideas , That's a terrible thing .

The software world we have worked hard to create , Maybe one day we will have a “ Dimension reduction blow ” 了 .

Google's AlphaGo, adopt “ Deep learning ”, I have defeated the go champion .

The other day , Google employees say ,AI Possessed personality .

I'm afraid to think about it .

I always feel that these are far away from us .

But your cell phone , Your computer , Collect your personal behavior all the time , Analyze your preferences , Recommend the products you may like .

On the other hand , You often click open to read , It is usually the content of a certain aspect , Seems to have been trapped in “ information cocoons ” Inside the .

All of this , Good or bad , Are imperceptibly affecting our lives , Changing the world .

Output from us “Hello, World!” rise , Human beings make continuous progress , Keep evolving , It permeates every corner of the human world , Every minute is changing our world .

these , It's a programmer's masterpiece .

Programmers are really changing the world .

Maybe you can't live without your cell phone ;

No computer , It seems that you can't go on with your work ;

modern society , No software seems to be collapsing .

Programmers incorporate many real-world concepts into the programming world . these , When you write code, you will realize , Even this “ Address ” The concept of , Are from the address of the human world . In a little bit more depth , Observer mode 、 The concept of these design patterns, such as factory pattern , It all comes from human life .

And these , A good idea or point of view , Continuous iteration , Make the software world colorful .

If you create MCU Applets are a world , The software program I created is also a small world , The software he wrote is also a small world , So connect these little worlds , As well as exchange of needed goods , This will form a big world , As the saying goes “ All things connected ” And so was born .

Okay , A colorful world , It's the programmer's creation .

Readers looking at my article , If you just finished the college entrance examination , When you fill in your application , Whether to consider such a noble profession ？

Ha ha ha ！