Showing content from https://cplusplus.com/reference/cstdlib/ below:
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 arithmetics, searching, sorting and converting.
Functions String conversion
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atof
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Convert string to double (function)
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atoi
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Convert string to integer (function)
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atol
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Convert string to long integer (function)
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atoll
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Convert string to long long integer (function)
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strtod
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Convert string to double (function)
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strtof
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Convert string to float (function)
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strtol
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Convert string to long integer (function)
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strtold
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Convert string to long double (function)
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strtoll
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Convert string to long long integer (function)
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strtoul
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Convert string to unsigned long integer (function)
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strtoull
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Convert string to unsigned long long integer (function)
Pseudo-random sequence generation
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rand
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Generate random number (function)
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srand
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Initialize random number generator (function)
Dynamic memory management
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calloc
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Allocate and zero-initialize array (function)
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free
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Deallocate memory block (function)
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malloc
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Allocate memory block (function)
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realloc
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Reallocate memory block (function)
Environment
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abort
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Abort current process (function)
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atexit
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Set function to be executed on exit (function)
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at_quick_exit
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Set function to be executed on quick exit (function)
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exit
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Terminate calling process (function)
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getenv
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Get environment string (function)
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quick_exit
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Terminate calling process quick (function)
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system
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Execute system command (function)
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_Exit
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Terminate calling process (function)
Searching and sorting
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bsearch
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Binary search in array (function)
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qsort
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Sort elements of array (function)
Integer arithmetics
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abs
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Absolute value (function)
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div
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Integral division (function)
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labs
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Absolute value (function)
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ldiv
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Integral division (function)
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llabs
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Absolute value (function)
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lldiv
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Integral division (function)
Multibyte characters
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mblen
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Get length of multibyte character (function)
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mbtowc
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Convert multibyte sequence to wide character (function)
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wctomb
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Convert wide character to multibyte sequence (function)
Multibyte strings
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mbstowcs
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Convert multibyte string to wide-character string (function)
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wcstombs
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Convert wide-character string to multibyte string (function)
Macro constants
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EXIT_FAILURE
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Failure termination code (macro)
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EXIT_SUCCESS
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Success termination code (macro)
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MB_CUR_MAX
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Maximum size of multibyte characters (macro)
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NULL
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Null pointer (macro)
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RAND_MAX
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Maximum value returned by rand (macro)
Types
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div_t
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Structure returned by div (type)
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ldiv_t
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Structure returned by ldiv (type)
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lldiv_t
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Structure returned by lldiv (type)
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size_t
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Unsigned integral type (type)
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