USAGE OF VI IN LIMUX

I think there are many kinds of Chinese editing languages, but they are not suitable for people like us to learn, we can learn some simple ones.

Chinese programming languages have been learned by Yi Language, Xinqi Chinese programming tools (Yaqi 880, Yaqi 990, Xinqi Small Potato, Xinqi Small Mushroom, Xinqi Little Pepper), Volcano Android, E4a (Easy Android) and other Chinese programming software. Open cloud Chinese programming technology exchange, is it helpful to you.

They are all programmed in English-based languages.

1. C language.

C language was born very early, when people were still generally used to writing software in assembly language, and there was no unified, universal operating system, basically software was written from 0. The policy of C language is to be more convenient and easy to use than compilation, and not to lose the expressive power of compilation. So C can be thought of as a "high-level assembly" language.

The C source can be easily mapped to the assembly and can be done without the need for a runtime environment. The characteristics of C are simple and easy to compile, and flexible and close to the bottom layer. So until now, some software that needs to deal directly with hardware is still written in C, such as (but not limited to) Linux kernel and some embedded domains.

2. C++ language.

In the early days of C++, it was based on C, and the early compilation method of C++ was to compile C++ into C and then call C's compiler to generate machine code. The approach to C++ is to increase the productivity of programmers, even at the cost of increasing compiler complexity.

The full name of C language: The C programming language, it is a general computer programming language, it is developed on the BCPL language, BCPL is called the basic combined programming language, because the C language is developed on its basis, so many C programmers like to interpret BCPL as (before C progamming language). The C language is widely used.

It is designed to provide a programming language that can be easily compiled, handle low-level memory, generate a small amount of machine code, and run without any runtime support. Therefore, C language has been widely used in hardware programming and system development, and most users now use Windows system and Linux system are developed in C language.

The full name of C++ language: The C++ programming language, which is a general-purpose programming language developed on the basis of C language, is widely used. C++ supports a variety of programming paradigms:

Object-oriented programming, generic programming, and procedural programming. The latest official standard, C++14, was published on August 18, 2014. It is one of the most widely used programming languages in the world, and is one of the most widely used and most powerful programming languages to date

Classes, encapsulation, overloads, and more! C++ is mainly used for large-scale application development, such as game development.

C is a general-purpose computer programming language, which is an improvement on the B language (BCPL). The C language was originally designed for the development of the UNIX operating system, which allowed it to compile in an easy way, handle low-level hardware memory, produce minimal assembly machine code, and run on any system without environmental support. Because of the above characteristics, C language has been widely used in low-level hardware programming and system kernel (low-level) development.

80% of UNIX systems are written in C. Most of the kernel of the Windows system is also developed in C.

The C+ language is an early programming language that has nothing to do with C C++, which is now deprecated and unknown. It has left so little information that no one remembers it for a long time.

C++ is an object-oriented extension of the C language, and a general-purpose computer programming language developed on the basis of the C language. The application is equally wide. The C language is purely procedural-oriented, and the C++ language adds object-oriented programming, generic programming, and procedural programming, support for classes, encapsulation, operator (function) overloading, and so on.

C++ has made a lot of improvements to the C language, making C++ not only have the low-level hardware operation characteristics of the C language, but also have a modern object-oriented new programming method, making it one of the most widely used and powerful programming languages to date. C++ is mainly used for the development of large-scale engineering projects, user interface development. For example, developing various games, etc.

To put it simply, C++ is C plus, plus. That is, it is a superset of the C language. Being a superset means that when a well-written ANSI Standard C program is committed to a C++ compiler, it can be compiled correctly.

Usually, *C files are considered to be C compilation mode, while *CPP is considered to be a C++ compilation model.

If you're an experienced C programmer, don't be intimidated by the C++ features, because the C++ language was created to allow C programmers to gradually transition to object-oriented programming. If you're just a junior C programmer, or you don't have much programming experience, it's a bit more effortless.

C++ features.

First of all, some of the features that distinguish C++ from C have nothing to do with object orientation. (Or rather, these features are just to make C easier to use.) Let's start with these features.

New annotation style.

C++ defines a new style of annotation, where two slashes ( ) represent a line of annotations. Previously, C programs had to use *-- to represent comments. Now you have a better choice. Enjoy this feature!

C is mainly sequential, branching, and looping, as well as procedures and function calls.

C++ is an object-oriented language that focuses on creating classes, inheriting and deriving classes, and building objects.

One is process-oriented and the other is object-oriented.

It's not that hard to learn technology.

du or not difficult, only suitable zhi or not suitable. For example, computer-related professional DAOs include software development, intra-network technology, big data cloud computing, animation and e-sports, UI design, environmental art design, e-commerce, etc. To learn these majors, you must first learn basic courses, such as assembly and maintenance, office software, basic design software, etc., will be basic learning in advance, as long as you lay a good foundation and choose the right and suitable major, then it will not be a problem to learn.

Choosing a major is based on your own logical thinking, hobbies, career tendencies, and so on.

If you have time, you can go to a computer school.

The best to use it yourself and solve the problem best.

It doesn't make much sense to compare programming languages with each other, if they are absolutely good, they will dominate the world as soon as possible, and if they are absolutely bad, they will be eliminated and will not be in your eyes.

There is no best, only better! Only by determining what program to do can we determine what language is best to use! Such as: Android or Windows? Is it the game side, or the database side, etc.?

To put it simply, it is easier to pronounce less than or equal to it.

Generally speaking, it was agreed that way, and everyone followed this.

In addition, the equal sign appears in the front, which needs to be distinguished from the assignment statement when doing syntax interpretation, which increases the difficulty of parsing.

Because the mathematical symbol itself is pronounced "less than or equal to", not "equal to less than".

Therefore, using <= to represent it is a matter of "natural course".

Less than or equal to <= is the most consistent to express it, to = "What for."

After using the "=" symbol, you get a fixed value, this point divides the continuous number into two parts, if you continue to filter on the number line, will it be left or right? After the "<" is identified, the right side of the number axis is left, and the "=" or ">" is continued to be filtered, which has a clear execution range, so that the machine can easily execute.

Imagine about that.

It is not reasonable to run first equal to and then run less than. It is not reasonable to make the data less than the changed data after the data is made.

These are conventions, and that's how they are prescribed.

Because this is the notation of programming languages that are popular nowadays. The original ones have basically been eliminated, and now those left are some of the more widely used techniques. We just need to go with the times.

Speak, because which word is appropriate and which word is inappropriate?

One is the stipulation, and the other is that < = is more comfortable to pronounce as Chinese.

?: means bai

Is it a conditional operator, and the du format used is as follows (conditional)? a:b, if the DAO condition is internal, the value of the expression can be a, otherwise it is b.

The meaning is to take non-operations,! True is false! false results are true.

Writing a program,? : Less used,! It is mainly used in conditional judgment.

Extended answer: 1. C language is a general-purpose computer programming language and is widely used. C is designed to provide a programming language that can compile in a simple way, handle low-level memory, generate a small amount of machine code, and run without any runtime support.

2. Although the C language provides many low-level processing functions, it still maintains a good cross-platform characteristic, and the C language program written with a standard specification can be compiled on many computer platforms, and even includes some embedded processors (single-chip microcomputers or MCUs) and supercomputers and other operating platforms.

3. There are only 32 keywords and 9 control statements in the C language, and the program is written in a free form and is case-sensitive. Combine the basic structure and sentences of a high-level language with the usefulness of a low-level language. Like assembly language, the C language can manipulate bits, bytes, and addresses, which are the most basic units of work of a computer.

c language'with'Applied in programming&&

1 5 step by step reading.

At? What is in front of the number is a question, then this question uses the expression of numbers, and the version is an expression, and this expression is a yes or no judgment.

a>b)

a==b)2/5(a>b)?

Determine whether the expression can pass, if it can pass, then the description can proceed to the subsequent operation, if not, choose the latter result.

3/5(a>b)?y:n

If a is greater than b, then the result of y is chosen, and if a is less than b, then the result of n is chosen.

4/5int x=(a>b)?y:n

if(x==y)

z=10;First of all, it is determined whether x is equal to y, and if it is equal to y, then the result of z is 10.

5/5int x=x+1;

int y=(x>10)?yes:no;

if(y==yes)

printf("%c",ok);

If x is turned into a loop, then x will run automatically, and when the requirements are met, the output will complete the task.