Notes on zero basic C language learning -- first introduction -- 1 notes that mom can understand

The first note ： Simple understanding of a small program “ The cabbage you can't get ”.

Catalog

1.C What is language ？

2. First write a program " The cabbage you can't get "

 2.1 Copy a program " The cabbage you can't get "

2.2 Create a process

3.code The meaning of ？ A jumble of letters and numbers ？

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1.C What is language ？

    C Language is a general computer programming language , Widely used in the underlying development .

    C The goal of language design is to provide a way to make it easy The way to compile 、 Processing low-level memory 、 production Generate a small amount of machine code and a programming language that can run without any running environment support .

    Even though C Language provides many low-level processing functions , But it still has good cross platform characteristics , Written in a standard specification C Language programs can be developed on many computer platforms Line compiler , It even includes some embedded processors （ Single chip computer MCU） And supercomputers . The 1980s , In order to avoid the use of C There are differences in language grammar , By the National Bureau of standards C Language system A complete set of American national standard language Law , be called ANSI C, As C The original standard of language . [1] at present 2011 year 12 month 8 Japan , International Organization for Standardization （ISO） and International Electrotechnical Commission （IEC） released C11 The standard is C The third official standard of language , It's also C The latest standard of language , The standard better supports Chinese function names and Chinese characters identifier , To a certain extent, it has realized Han Word programming .

   C Language is a process oriented computer programming language , And C++,Java Object oriented programming languages such as . 

summary ： After long-term evolution , Modern programming is more convenient , Efficient , A wider range of languages .

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2. First write a program " The cabbage you can't get "

First install one visual studio 2019/2022  This thing is software ,“ On the number ” use !

 2.1 Copy a program " The cabbage you can't get "

#include<stdio.h>
int main()
{
	printf(" The cabbage you can't get 
");
	return 0;
}

2.2 Create a process

First step ; Create a project

  The second step ; Copy the code in , Pay attention to the punctuation of English input method .

The third step   Run code （ Shortcut key Ctrl+F5 ）

then , You get a small black window , It printed out “ The cabbage you can't get ,” It means that the operation is successful .

summary ： I wonder what the letters are ？ What is this ？ Comfort yourself , Normal , Copy slowly ！

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3.code The meaning of ？ A jumble of letters and numbers ？

#include<stdio.h>
int main()
{
	printf(" The cabbage you can't get 
");
	return 0;
}

#include<stdio.h>    This is called a reference header file

　   include It's called a file containing command , The meaning is to put angle brackets "" Or quotation marks <> The files specified in are included in this program , Become part of this program . Included files are usually provided by the system , Its extension is .h 

•  stdio.h Is refers to “standard input&output" This means that the standard I / O header file ! So when using standard I / O functions , You need to call this header file ! That is to say printf standard output , In the future, I will see the cry scanf The standard input .
• int  This thing is called “ integer constants ”   ---------------> Click to learn data type , Constant , Variable
• main It's called the main function
• return 0 The explanation is not clear at present , main function   You have to return one anyway
• /n  This is called “ Line break ”  Belongs to escape character ----------------> Click to learn Escape character + notes + character string
• printf Is the print function （ His function is to make the above “ The cabbage you can't get ” Printed on a black window ）

summary ： To master strange letters and computer language “ Data symbols ”, Learn to imitate first ！！！