The C <stdlib.h> header defines several general purpose functions which includes dynamic memory management, random number generation, communication with the environment, integer arithmetics, searching, sorting and converting.
| Functions | Description |
|---|
| atoi() |
Converts a byte string to an integer value. |
| atol() |
Converts a byte string to a long integer value. |
| atoll() |
Converts a byte string to a long long integer value. |
| Functions | Description |
|---|
| calloc() |
Allocate and zero-initialize array. |
| free() |
Deallocates previously allocated memory. |
| malloc() |
Allocates memory. |
| realloc() |
Reallocates previously allocated memory block. |
| Functions | Description |
|---|
| rand() |
Returns a pseudo-random integral value between 0 and RAND_MAX. |
| srand() |
Seeds the pseudo-random number generator used by rand() with the value seed. |
| Functions | Description |
|---|
| abs() |
Returns absolute value of an integral value. |
| div() |
Returns quotient and remainder of integer division. |
| labs() |
Returns absolute value of an integral value. |
| ldiv() |
Returns quotient and remainder of integer division. |
| llabs() |
Returns absolute value of an integral value. |
| lldiv() |
Returns quotient and remainder of integer division. |
| Functions | Description |
|---|
| mblen() |
Returns the number of bytes in the next multibyte character. |
| mbtowc() |
Converts the next multibyte character to wide character. |
| wctomb() |
Converts a wide character to its multibyte representation. |
