C Standard Library - Reference Manual | Tutorial

Tutorial -- Learning not just technology, but dreams!

• Home
• HTML
• JavaScript
• CSS
• Vue
• React
• Python3
• Java
• C
• C++
• C#
• AI
• Go
• SQL
• Linux
• VS Code
• Bootstrap
• Git
• Local Bookmarks

• Home
• HTML
• CSS
• JS
• Local Bookmarks
• Search

• Vue3 Tutorial
• Vue2 Tutorial

• Bootstrap3
• Bootstrap4
• Bootstrap5

• Machine Learning
• PyTorch
• TensorFlow
• Sklearn
• NLP
• AI Agent
• Ollama
• Coding Plan

C Tutorial

C Language Tutorial C Introduction C Environment Setup C VScode C Program Structure C Basic Syntax C Data Types C Variables C Constants C Storage Classes C Operators C Decision Making C Loops C Functions C Scope Rules C Arrays C enum (Enumeration) C Pointers C Function Pointers and Callback Functions C Strings C Structures C Unions C Bit Fields C typedef C Input & Output C File I/O C Preprocessors C Header Files C Type Casting C Error Handling C Recursion C Variable Arguments C Memory Management C Undefined Behavior C Command Line Arguments C Safe Functions C Sorting Algorithms C Project Structure C Examples C Classic 100 Examples C Quiz

C Standard Library

C Standard Library - Reference Manual <a href="#" title="C Standard Library - ">C Standard Library - <a href="#" title="C Standard Library - ">C Standard Library - <a href="#" title="C Standard Library - ">C Standard Library - <a href="#" title="C Standard Library - ">C Standard Library - <a href="#" title="C Standard Library - ">C Standard Library - <a href="#" title="C Standard Library - ">C Standard Library - <a href="#" title="C Standard Library -

C Quiz

<a href="#" title="C Standard Library – ">C Standard Library –

Deep Dive

• Web Service
• Programming
• Computer Science
• Scripting Languages
• Development Tools
• Programming Languages
• Scripts
• Web Services
• Software
• Web Design & Development

C Standard Library - Reference Manual

Below is a detailed list of C standard library header files and their functional descriptions:

C is a general-purpose, procedural computer programming language. In 1972, Dennis Ritchie designed and developed the C language at Bell Telephone Laboratories for the purpose of porting and developing the UNIX operating system.

C is a widely used computer language, as popular as the Java programming language, and both are widely used among modern software programmers.

The C Standard Library contains a set of header files that provide many functions and macros for handling common programming tasks such as input/output, string manipulation, mathematical calculations, and memory management.

Who is this tutorial suitable for?

The C Standard Library can serve as a reference manual for C programmers, who can consult this manual when developing projects related to system programming. It helps them at every step of system-related tasks. We explain all C functions in an easy-to-understand manner, and you can directly copy and use these examples in your projects.

Prerequisites for reading this tutorial

A basic understanding of the C language will help you understand the built-in C functions covered in this standard library.

Compiling/Executing C Programs

If you want to learn C programming on a Linux server but don't have the relevant environment configured, you can visit the C Online Compiler. You just need a simple click to experience real programming on a high-end server. This is a completely free online tool.

Standard Library

Header File	Functional Description
<stdio.h>	Standard Input/Output Library, contains functions like printf, scanf, fgets, fputs, etc.
<stdlib.h>	Standard Library Functions, contains memory allocation, program control, conversion functions, etc., such as malloc, free, exit, atoi, rand, etc.
<string.h>	String Manipulation Functions, such as strlen, strcpy, strcat, strcmp, etc.
<math.h>	Mathematical Function Library, contains various mathematical operation functions, such as sin, cos, tan, exp, log, sqrt, etc.
<time.h>	Time and Date Functions, such as time, clock, difftime, strftime, etc.
<ctype.h>	Character Handling Functions, such as isalpha, isdigit, isspace, toupper, tolower, etc.
<limits.h>	Defines limit values for various types, such as INT_MAX, CHAR_MIN, LONG_MAX, etc.
<float.h>	Defines limit values for floating-point types, such as FLT_MAX, DBL_MIN, etc.
<assert.h>	Contains the macro assert, used for assertion checking during debugging.
<errno.h>	Defines the error code variable errno and related macros, used for representing and handling errors.
<stddef.h>	Defines some common types and macros, such as size_t, ptrdiff_t, NULL, etc.
<signal.h>	Defines functions and macros for handling signals, such as signal, raise, etc.
<setjmp.h>	Provides macros and functions for non-local jumps, such as setjmp, longjmp, etc.
<locale.h>	Defines functions and macros related to localization, such as setlocale, localeconv, etc.
<stdarg.h>	Provides macros for handling variable argument functions, such as va_start, va_arg, va_end, etc.
<stdbool.h>	Defines the boolean type and values true and false.
<stdint.h>	Defines exact-width integer types, such as int8_t, uint16_t, etc.
<inttypes.h>	Provides formatted output macros and functions related to integer types.
<complex.h>	Provides functions and macros for complex number operations, such as cabs, carg, etc.
<tgmath.h>	Provides macros for generic math functions to simplify mathematical operations on different data types.
<fenv.h>	Provides control over the floating-point environment, such as rounding modes and exception states.