C standard library

1 assert.h

1.1 assert

2 ctype.h

2.1 is... Functions
2.2 to... Functions

3 errno.h

3.1 EDOM
3.2 ERANGE
3.3 errno

4 float.h

4.1 Defined Values

5 limits.h

5.1 Defined Values

6 locale.h

6.1 Variables and Definitions
6.2 setlocale
6.3 localeconv

7 math.h

7.1 Error Conditions
7.2 Trigonometric Functions

7.2.1 acos
7.2.2 asin
7.2.3 atan
7.2.4 atan2
7.2.5 cos
7.2.6 cosh
7.2.7 sin
7.2.8 sinh
7.2.9 tan
7.2.10 tanh

7.3 Exponential, Logarithmic, and Power Functions

7.3.1 exp
7.3.2 frexp
7.3.3 ldexp
7.3.4 log
7.3.5 log10
7.3.6 modf
7.3.7 pow
7.3.8 sqrt
7.4 Other Math Functions
7.4.1 ceil
7.4.2 fabs
7.4.3 floor
7.4.4 fmod

8 setjmp.h

8.1 Variables and Definitions
8.2 setjmp
8.3 longjmp

9 signal.h

9.1 Variables and Definitions
9.2 signal
9.3 raise

10 stdarg.h

10.1 Variables and Definitions
10.2 va_start
10.3 va_arg
10.4 va_end

11 stddef.h

11.1 Variables and Definitions

12 stdio.h

12.1 Variables and Definitions
12.2 Streams and Files
12.3 File Functions

12.3.1 clearerr
12.3.2 fclose
12.3.3 feof
12.3.4 ferror
12.3.5 fflush
12.3.6 fgetpos
12.3.7 fopen
12.3.8 fread
12.3.9 freopen
12.3.10 fseek
12.3.11 fsetpos
12.3.12 ftell
12.3.13 fwrite
12.3.14 remove
12.3.15 rename
12.3.16 rewind
12.3.17 setbuf
12.3.18 setvbuf
12.3.19 tmpfile
12.3.20 tmpnam

12.4 Formatted I/O Functions

12.4.1 ...printf Functions
12.4.2 ...scanf Functions

12.5 Character I/O Functions

12.5.1 fgetc
12.5.2 fgets
12.5.3 fputc
12.5.4 fputs
12.5.5 getc
12.5.6 getchar
12.5.7 gets
12.5.8 putc
12.5.9 putchar
12.5.10 puts
12.5.11 ungetc

12.7 Error Functions

12.7.1 perror

13 stdlib.h

13.1 Variables and Definitions
13.2 String Functions

13.2.1 atof
13.2.2 atoi
13.2.3 atol
13.2.4 strtod
13.2.5 strtol
13.2.6 strtoul

13.3 Memory Functions

13.3.1 calloc
13.3.2 free
13.3.3 malloc
13.3.4 realloc

13.4 Environment Functions

13.4.1 abort
13.4.2 atexit
13.4.3 exit
13.4.4 getenv
13.4.5 system

13.5 Searching and Sorting Functions

13.5.1 bsearch
13.5.2 qsort

13.6 Math Functions

13.6.1 abs
13.6.2 div
13.6.3 labs
13.6.4 ldiv
13.6.5 rand
13.6.6 srand
13.7 Multibyte Functions
13.7.1 mblen
13.7.2 mbstowcs
13.7.3 mbtowc
13.7.4 wcstombs
13.7.5 wctomb

14 string.h

14.1 Variables and Definitions
14.2 memchr
14.3 memcmp
14.4 memcpy
14.5 memmove
14.6 memset
14.7 strcat
14.8 strncat
14.9 strchr
14.10 strcmp
14.11 strncmp
14.12 strcoll
14.13 strcpy
14.14 strncpy
14.15 strcspn
14.16 strerror
14.17 strlen
14.18 strpbrk
14.19 strrchr
14.20 strspn
14.21 strstr
14.22 strtok
14.23 strxfrm

15 time.h

15.1 Variables and Definitions
15.2 asctime
15.3 clock
15.4 ctime
15.5 difftime
15.6 gmtime
15.7 localtime
15.8 mktime
15.9 strftime
15.10 time