cstdlib (stdlib.h)

header

cstdlib (stdlib.h)

C Standard General Utilities Library

This header defines several general purpose functions, including dynamic memory management, random number generation, communication with the environment, integer arthmetics, searching, sorting and converting.

Functions

String conversion:

atof

Convert string to double (function)

atoi

Convert string to integer (function)

atol

Convert string to long integer (function)

strtod

Convert string to double (function)

strtol

Convert string to long integer (function )

strtoul

Convert string to unsigned long integer (function )

Pseudo-random sequence generation:

rand

Generate random number (function)

srand

Initialize random number generator (functions)

Dynamic memory management:

calloc

Allocate space for array in memory (function)

free

Deallocate space in memory (function)

malloc

Allocate memory block (function)

realloc

Reallocate memory block (function)

Environment:

abort

Abort current process (function)

atexit

Set function to be executed on exit (function)

exit

Terminate calling process (function)

getenv

Get environment string (function)

system

Execute system command (function )

Searching and sorting:

bsearch

Binary search in array (function )

qsort

Sort elements of array (function)

Integer arithmethics:

abs

Absolute value (function)

div

Integral division (function )

labs

Absolute value (function)

ldiv

Integral division (function )

Multibyte characters:

mblen

Get length of multibyte character (function)

mbtowc

Convert multibyte character to wide character (function)

wctomb

Convert wide character to multibyte character (function)

Multibyte strings:

mbstowcs

Convert multibyte string to wide-character string (function)

wcstombs

Convert wide-character string to multibyte string (function)

 

Macros

EXIT_FAILURE

Failure termination code (macro)

EXIT_SUCCESS

Success termination code (macro)

MB_CUR_MAX

Maximum size of multibyte characters (macro)

NULL

Null pointer (macro)

RAND_MAX

Maximum value returned by rand (macro)

 

Types

div_t

Structure returned by div (type)

ldiv_t

Structure returned by div and ldiv (type)

size_t

Unsigned integral type (type)