- The C Standard Library
Cstdlib Vs Stdlib
Input and Output operations can also be performed in C using the C Standard Input and Output Library (cstdio, known as stdio.h in the C language). This library uses what are called streams to operate with physical devices such as keyboards, printers, terminals or with any other type of files supported by the system.
- C Standard Library Resources
- C Programming Resources
- Selected Reading
The stdlib.h header defines four variable types, several macros, and various functions for performing general functions.
Library Variables
Following are the variable types defined in the header stdlib.h −
Sr.No. | Variable & Description |
---|---|
1 | size_t This is the unsigned integral type and is the result of the sizeof keyword. |
2 | wchar_t This is an integer type of the size of a wide character constant. |
3 | div_t This is the structure returned by the div function. |
4 | ldiv_t This is the structure returned by the ldiv function. |
Library Macros
Following are the macros defined in the header stdlib.h −
Sr.No. | Macro & Description |
---|---|
1 | NULL This macro is the value of a null pointer constant. |
2 | EXIT_FAILURE This is the value for the exit function to return in case of failure. |
3 | EXIT_SUCCESS This is the value for the exit function to return in case of success. |
4 | RAND_MAX This macro is the maximum value returned by the rand function. |
5 | MB_CUR_MAX This macro is the maximum number of bytes in a multi-byte character set which cannot be larger than MB_LEN_MAX. |
Library Functions
C++ Stdlib
Following are the functions defined in the header stlib.h −
Sr.No. | Function & Description |
---|---|
1 | double atof(const char *str) Converts the string pointed to, by the argument str to a floating-point number (type double). |
2 | int atoi(const char *str) Converts the string pointed to, by the argument str to an integer (type int). |
3 | long int atol(const char *str) Converts the string pointed to, by the argument str to a long integer (type long int). |
4 | double strtod(const char *str, char **endptr) Converts the string pointed to, by the argument str to a floating-point number (type double). |
5 | long int strtol(const char *str, char **endptr, int base) Converts the string pointed to, by the argument str to a long integer (type long int). |
6 | unsigned long int strtoul(const char *str, char **endptr, int base) Converts the string pointed to, by the argument str to an unsigned long integer (type unsigned long int). |
7 | void *calloc(size_t nitems, size_t size) Allocates the requested memory and returns a pointer to it. |
8 | void free(void *ptr Deallocates the memory previously allocated by a call to calloc, malloc, or realloc. |
9 | void *malloc(size_t size) Allocates the requested memory and returns a pointer to it. |
10 | void *realloc(void *ptr, size_t size) Attempts to resize the memory block pointed to by ptr that was previously allocated with a call to malloc or calloc. |
11 | void abort(void) Causes an abnormal program termination. |
12 | int atexit(void (*func)(void)) Causes the specified function func to be called when the program terminates normally. |
13 | void exit(int status) Causes the program to terminate normally. |
14 | char *getenv(const char *name) Searches for the environment string pointed to by name and returns the associated value to the string. |
15 | int system(const char *string) The command specified by string is passed to the host environment to be executed by the command processor. |
16 | void *bsearch(const void *key, const void *base, size_t nitems, size_t size, int (*compar)(const void *, const void *)) Performs a binary search. |
17 | void qsort(void *base, size_t nitems, size_t size, int (*compar)(const void *, const void*)) Sorts an array. |
18 | int abs(int x) Returns the absolute value of x. |
19 | div_t div(int numer, int denom) Divides numer (numerator) by denom (denominator). |
20 | long int labs(long int x) Returns the absolute value of x. Vst multipanner free download. This mode allows you to create the channel-based bed mix. Object ModeSets the panner to object mode. TUNE-UP ENGINE COMPONENTSTo maintain the performance and responsiveness of your car, truck, or other vehicle it is essential to tune-up engine components regularly, and in a timely manner. For more information on vehicle tune-ups, engine parts assessed during the, or recommended engine and fuel system services based on your car’s current mileage and age, don’t hesitate to reach out to a Firestone Complete Auto Care tire and auto service professional and setup an appointment. The engine components evaluated during an engine tune-up service will vary depending on your vehicle’s condition, mileage, and manufacture’s recommendations. N tune auto engine tune. |
21 | ldiv_t ldiv(long int numer, long int denom) Divides numer (numerator) by denom (denominator). |
22 | int rand(void) Returns a pseudo-random number in the range of 0 to RAND_MAX. |
23 | void srand(unsigned int seed) This function seeds the random number generator used by the function rand. |
24 | int mblen(const char *str, size_t n) Returns the length of a multibyte character pointed to by the argument str. |
25 | size_t mbstowcs(schar_t *pwcs, const char *str, size_t n) Converts the string of multibyte characters pointed to by the argument str to the array pointed to by pwcs. |
26 | int mbtowc(whcar_t *pwc, const char *str, size_t n) Examines the multibyte character pointed to by the argument str. |
27 | size_t wcstombs(char *str, const wchar_t *pwcs, size_t n) Converts the codes stored in the array pwcs to multibyte characters and stores them in the string str. |
28 | int wctomb(char *str, wchar_t wchar) Examines the code which corresponds to a multibyte character given by the argument wchar. |