What is the difference between c language and javascript-Front-end Q&A-php.cn

Home

Web Front-end

Front-end Q&A

What is the difference between c language and javascript

青灯夜游

Oct 13, 2021 pm 02:30 PM

c languagejavascript

Difference: 1. C language is mainly compiled into machine language, and JavaScript is mainly interpreted and executed as a script by the interpreter; 2. The memory of C language needs to be manually managed by programmers, while the memory of JS is interpreted by the interpreter. It is managed by the processor; 3. C language is a statically typed language, and JS is a dynamically typed language; 4. There are closures in JS, but not in C language.

What is the difference between c language and javascript

The operating environment of this tutorial: windows7 system, javascript1.8.5&&c99 version, Dell G3 computer.

What is C language?

C language is a process-oriented, abstract, general-purpose programming language that is widely used in low-level development. C language can compile and process low-level memory in a simple way. C language is an efficient programming language that only generates a small amount of machine language and can run without any operating environment support.

What is JavaScript?

JavaScript is a high-level, interpreted, literal scripting language. It is a prototype-based, function-first language. It is a multi-paradigm language. It supports object-oriented programming, command programming, and functional programming.

The similarities between c language and javascript:

Some lexical and syntax are the same. The design of JavaScript's lexical and syntax is based on Java, and the design of Java's lexical and syntax is based on C. The lexical and syntax that I think of for JavaScript, Java, C and C are the same:

1. Use a single equal sign as an assignment operator instead of an equality judgment operator, such as: a=b 1 represents "put The result of variable b 1 is assigned to variable a" instead of "the value of variable a is equal to the value of variable b 1";

2. The assignment operation is an expression and can be used as a value to participate in other operations, such as (a=b 1)>10;

3. The statement ends with a semicolon;

4.It starts with “0x” to represent the hexadecimal number;

5. Use "&", "|", "^", "!", "&&" and "||" as bitwise AND, bitwise OR, bitwise XOR, logical NOT, logical AND, and logical OR operations respectively. operator;

6, ternary operator composed of question mark and colon;

7, multiplication and division operators, addition and subtraction operators, comparison operators, logical and logical or operators, assignment The priority order of operators;

8. The syntax of function call is "function name (parameter 1, parameter 2, ...)";

9. Code blocks are placed within curly brackets;

10. Grammar of if, for, while, do-while, switch-case, break;...

The difference between c language and javascript:

1. C language is mainly compiled into machine language, while JavaScript is mainly interpreted and executed as a script by the interpreter;

2. C language requires programmers to manually manage memory (mainly refers to the application of heap memory and release), while JavaScript memory is managed by the interpreter;

3. C language is a statically typed language, that is, the data type of each variable is determined before the program is run and cannot be changed during runtime. , and JavaScript is a dynamically typed language, and the data type of variables can still change at runtime;

4. There is no concept of closure in C language, and functions in JavaScript are composed of variables that can be accessed when they are defined. Closure;

5. C language does not support object-oriented features such as "class member methods", "class member encapsulation (invisible to the outside)", "class inheritance and polymorphism", and JavaScript can achieve object-oriented inheritance, polymorphism and encapsulation through prototype chains and closures. JavaScript that implements ECMAScript 2015 and above supports the definition of classes at the grammatical level;

6. C language can Calling the system API to implement multi-threading can improve the CPU utilization during blocking operations (mainly IO), while JavaScript is mainly single-threaded, and all possible blocking operations in JavaScript are handled by the asynchronous API provided by the JavaScript runtime. Complete

For more programming-related knowledge, please visit:Introduction to Programming! !

The above is the detailed content of What is the difference between c language and javascript. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

HTML and React's Integration: A Practical GuideApr 21, 2025 am 12:16 AM

HTML and React can be seamlessly integrated through JSX to build an efficient user interface. 1) Embed HTML elements using JSX, 2) Optimize rendering performance using virtual DOM, 3) Manage and render HTML structures through componentization. This integration method is not only intuitive, but also improves application performance.

React and HTML: Rendering Data and Handling EventsApr 20, 2025 am 12:21 AM

React efficiently renders data through state and props, and handles user events through the synthesis event system. 1) Use useState to manage state, such as the counter example. 2) Event processing is implemented by adding functions in JSX, such as button clicks. 3) The key attribute is required to render the list, such as the TodoList component. 4) For form processing, useState and e.preventDefault(), such as Form components.

The Backend Connection: How React Interacts with ServersApr 20, 2025 am 12:19 AM

React interacts with the server through HTTP requests to obtain, send, update and delete data. 1) User operation triggers events, 2) Initiate HTTP requests, 3) Process server responses, 4) Update component status and re-render.

React: Focusing on the User Interface (Frontend)Apr 20, 2025 am 12:18 AM

React is a JavaScript library for building user interfaces that improves efficiency through component development and virtual DOM. 1. Components and JSX: Use JSX syntax to define components to enhance code intuitiveness and quality. 2. Virtual DOM and Rendering: Optimize rendering performance through virtual DOM and diff algorithms. 3. State management and Hooks: Hooks such as useState and useEffect simplify state management and side effects handling. 4. Example of usage: From basic forms to advanced global state management, use the ContextAPI. 5. Common errors and debugging: Avoid improper state management and component update problems, and use ReactDevTools to debug. 6. Performance optimization and optimality

React's Role: Frontend or Backend? Clarifying the DistinctionApr 20, 2025 am 12:15 AM

Reactisafrontendlibrary,focusedonbuildinguserinterfaces.ItmanagesUIstateandupdatesefficientlyusingavirtualDOM,andinteractswithbackendservicesviaAPIsfordatahandling,butdoesnotprocessorstoredataitself.

React in the HTML: Building Interactive User InterfacesApr 20, 2025 am 12:05 AM

React can be embedded in HTML to enhance or completely rewrite traditional HTML pages. 1) The basic steps to using React include adding a root div in HTML and rendering the React component via ReactDOM.render(). 2) More advanced applications include using useState to manage state and implement complex UI interactions such as counters and to-do lists. 3) Optimization and best practices include code segmentation, lazy loading and using React.memo and useMemo to improve performance. Through these methods, developers can leverage the power of React to build dynamic and responsive user interfaces.

React: The Foundation for Modern Frontend DevelopmentApr 19, 2025 am 12:23 AM

React is a JavaScript library for building modern front-end applications. 1. It uses componentized and virtual DOM to optimize performance. 2. Components use JSX to define, state and attributes to manage data. 3. Hooks simplify life cycle management. 4. Use ContextAPI to manage global status. 5. Common errors require debugging status updates and life cycles. 6. Optimization techniques include Memoization, code splitting and virtual scrolling.

The Future of React: Trends and Innovations in Web DevelopmentApr 19, 2025 am 12:22 AM

React's future will focus on the ultimate in component development, performance optimization and deep integration with other technology stacks. 1) React will further simplify the creation and management of components and promote the ultimate in component development. 2) Performance optimization will become the focus, especially in large applications. 3) React will be deeply integrated with technologies such as GraphQL and TypeScript to improve the development experience.

See all articles