Prev | Contents | Next

Beej's Guide to C Programming

Library Reference

Brian “Beej Jorgensen” Hall

v0.9.13, Copyright © October 15, 2026

1 Foreword
2 The C Language
3 <assert.h> Runtime and Compile-time Diagnostics
4 <complex.h> Complex Number Functionality
5 <ctype.h> Character Classification and Conversion
6 <errno.h> Error Information
- 6.1 errno
7 <fenv.h> Floating Point Exceptions and Environment
8 <float.h> Floating Point Limits
9 <inttypes.h> More Integer Conversions
10 <iso646.h> Alternative Operator Spellings
11 <limits.h> Numeric Limits
12 <locale.h> locale handling
- 12.1 setlocale()
- 12.2 localeconv()
13 <math.h> Mathematics
14 <setjmp.h> Non-local Goto
- 14.1 setjmp()
- 14.2 longjmp()
15 <signal.h> signal handling
- 15.1 signal()
- 15.2 raise()
16 <stdalign.h> Macros for Alignment
- 16.1 alignas() _Alignas()
- 16.2 alignof() _Alignof()
17 <stdarg.h> Variable Arguments
18 <stdatomic.h> Atomic-Related Functions
19 <stdbit.h> Bit-Related Functions
20 <stdbool.h> Boolean Types
- 20.1 Example
- 20.2 _Bool?
21 <stddef.h> A Few Standard Definitions
22 <stdint.h> More Integer Types
23 <stdio.h> Standard I/O Library
24 <stdlib.h> Standard Library Functions
25 <stdnoreturn.h> Macros for Non-Returning Functions
26 <string.h> String Manipulation
27 <tgmath.h> Type-Generic Math Functions
- 27.1 Example
28 <threads.h> Multithreading Functions
29 <time.h> Date and Time Functions
30 <uchar.h> Unicode utility functions
31 <wchar.h> Wide Character Handling
32 <wctype.h> Wide Character Classification and Transformation

Prev | Contents | Next