search
HomeBackend DevelopmentC++How to calculate the length of string in C language

计算 C 语言中字符串长度的方法是:使用 strlen() 函数手动计算,遍历字符串并计数字符数量

How to calculate the length of string in C language

C 语言中字符串长度的计算

在 C 语言中,字符串是一种数据类型,表示由字符组成的序列。字符串的长度是指其中包含的字符数,不包括终止字符'\0'。

计算字符串长度的方法:

可以通过以下两种方法之一计算字符串的长度:

  • strlen() 函数:

    • 调用 strlen(str) 函数,其中 str 是指向字符串的指针。
    • 该函数返回字符串的长度,即到终止字符'\0'为止的字符数。
  • 手动计算:

    • 遍历字符串,逐个字符进行计数。
    • 循环直到遇到终止字符'\0',并记下遇到的字符数。

示例:

#include <stdio.h>
#include <string.h>

int main() {
  char str[] = "Hello, world!";

  // 使用 strlen() 函数
  int len1 = strlen(str);

  // 手动计算
  int len2 = 0;
  while (str[len2] != '\0') {
    len2++;
  }

  printf("字符串长度 (strlen()): %d\n", len1);
  printf("字符串长度 (手动计算): %d\n", len2);

  return 0;
}

The above is the detailed content of How to calculate the length of string in C language. 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
C   in Specific Domains: Exploring Its StrongholdsC in Specific Domains: Exploring Its StrongholdsMay 06, 2025 am 12:08 AM

C is widely used in the fields of game development, embedded systems, financial transactions and scientific computing, due to its high performance and flexibility. 1) In game development, C is used for efficient graphics rendering and real-time computing. 2) In embedded systems, C's memory management and hardware control capabilities make it the first choice. 3) In the field of financial transactions, C's high performance meets the needs of real-time computing. 4) In scientific computing, C's efficient algorithm implementation and data processing capabilities are fully reflected.

Debunking the Myths: Is C   Really a Dead Language?Debunking the Myths: Is C Really a Dead Language?May 05, 2025 am 12:11 AM

C is not dead, but has flourished in many key areas: 1) game development, 2) system programming, 3) high-performance computing, 4) browsers and network applications, C is still the mainstream choice, showing its strong vitality and application scenarios.

C# vs. C  : A Comparative Analysis of Programming LanguagesC# vs. C : A Comparative Analysis of Programming LanguagesMay 04, 2025 am 12:03 AM

The main differences between C# and C are syntax, memory management and performance: 1) C# syntax is modern, supports lambda and LINQ, and C retains C features and supports templates. 2) C# automatically manages memory, C needs to be managed manually. 3) C performance is better than C#, but C# performance is also being optimized.

Building XML Applications with C  : Practical ExamplesBuilding XML Applications with C : Practical ExamplesMay 03, 2025 am 12:16 AM

You can use the TinyXML, Pugixml, or libxml2 libraries to process XML data in C. 1) Parse XML files: Use DOM or SAX methods, DOM is suitable for small files, and SAX is suitable for large files. 2) Generate XML file: convert the data structure into XML format and write to the file. Through these steps, XML data can be effectively managed and manipulated.

XML in C  : Handling Complex Data StructuresXML in C : Handling Complex Data StructuresMay 02, 2025 am 12:04 AM

Working with XML data structures in C can use the TinyXML or pugixml library. 1) Use the pugixml library to parse and generate XML files. 2) Handle complex nested XML elements, such as book information. 3) Optimize XML processing code, and it is recommended to use efficient libraries and streaming parsing. Through these steps, XML data can be processed efficiently.

C   and Performance: Where It Still DominatesC and Performance: Where It Still DominatesMay 01, 2025 am 12:14 AM

C still dominates performance optimization because its low-level memory management and efficient execution capabilities make it indispensable in game development, financial transaction systems and embedded systems. Specifically, it is manifested as: 1) In game development, C's low-level memory management and efficient execution capabilities make it the preferred language for game engine development; 2) In financial transaction systems, C's performance advantages ensure extremely low latency and high throughput; 3) In embedded systems, C's low-level memory management and efficient execution capabilities make it very popular in resource-constrained environments.

C   XML Frameworks: Choosing the Right One for YouC XML Frameworks: Choosing the Right One for YouApr 30, 2025 am 12:01 AM

The choice of C XML framework should be based on project requirements. 1) TinyXML is suitable for resource-constrained environments, 2) pugixml is suitable for high-performance requirements, 3) Xerces-C supports complex XMLSchema verification, and performance, ease of use and licenses must be considered when choosing.

C# vs. C  : Choosing the Right Language for Your ProjectC# vs. C : Choosing the Right Language for Your ProjectApr 29, 2025 am 12:51 AM

C# is suitable for projects that require development efficiency and type safety, while C is suitable for projects that require high performance and hardware control. 1) C# provides garbage collection and LINQ, suitable for enterprise applications and Windows development. 2)C is known for its high performance and underlying control, and is widely used in gaming and system programming.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.