Cstdlib Dev C++

Cstdlib Dev C++ Rating: 4,0/5 7577 reviews
  • The C Standard Library
  • C Standard Library Resources
  • C Programming Resources
  • Selected Reading

11 Added in the C11 standard. 14 Added in the C14 standard. 17 Added in the C17 standard. 20 Added in the draft C20 standard. A Deprecated in the C17 standard. B Removed in the draft C20 standard. A project to bring elements of the std namespace from C to PHP 5.3. It will include common C includes (cstdlib,cmath,etc) as well as several classes derived from. This header was originally in the C standard library as. This header provides miscellaneous utilities. Symbols defined here are used by several library components. If you get it 'for free' with, that's a sign that your header requires it, but then you're relying on an implementation detail of your C library. Btw., #include cstdlib is not guaranteed to bring C functions into the global namespace (although it commonly does so in C implementations); it is guaranteed to put them in.

  1. The GNU C Library is distributed in the hope that it will be useful, 10: but WITHOUT ANY WARRANTY; without even the implied warranty of: 11.
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  3. 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.

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

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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

Following are the functions defined in the header stlib.h −

Sr.No.Function & Description
1double atof(const char *str)

Converts the string pointed to, by the argument str to a floating-point number (type double).

2int atoi(const char *str)

Converts the string pointed to, by the argument str to an integer (type int).

3long int atol(const char *str)

Converts the string pointed to, by the argument str to a long integer (type long int).

4double strtod(const char *str, char **endptr)

Converts the string pointed to, by the argument str to a floating-point number (type double).

5long 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).

6unsigned 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).

7void *calloc(size_t nitems, size_t size)

Allocates the requested memory and returns a pointer to it.

8void free(void *ptr

Deallocates the memory previously allocated by a call to calloc, malloc, or realloc.

9void *malloc(size_t size)

Allocates the requested memory and returns a pointer to it.

10void *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.

11void abort(void)

Causes an abnormal program termination.

12int atexit(void (*func)(void))

Causes the specified function func to be called when the program terminates normally.

13void exit(int status)

Causes the program to terminate normally.

14char *getenv(const char *name)

Searches for the environment string pointed to by name and returns the associated value to the string.

15int system(const char *string)

The command specified by string is passed to the host environment to be executed by the command processor.

16void *bsearch(const void *key, const void *base, size_t nitems, size_t size, int (*compar)(const void *, const void *))

Performs a binary search.

17void qsort(void *base, size_t nitems, size_t size, int (*compar)(const void *, const void*))

Sorts an array.

18int abs(int x)

Returns the absolute value of x.

19div_t div(int numer, int denom)

Divides numer (numerator) by denom (denominator).

20long int labs(long int x)

Returns the absolute value of x.

21ldiv_t ldiv(long int numer, long int denom)

Divides numer (numerator) by denom (denominator).

22int rand(void)

Returns a pseudo-random number in the range of 0 to RAND_MAX.

23void srand(unsigned int seed)

This function seeds the random number generator used by the function rand.

24int mblen(const char *str, size_t n)

Returns the length of a multibyte character pointed to by the argument str.

25size_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.

26int mbtowc(whcar_t *pwc, const char *str, size_t n)

Examines the multibyte character pointed to by the argument str.

27size_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.

28int wctomb(char *str, wchar_t wchar)

Examines the code which corresponds to a multibyte character given by the argument wchar.

  • The C Standard Library
  • C Standard Library Resources
  • C Programming Resources

Cstdlib In C++

  • 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.

Cstdlib Vs Stdlib

Library Functions

Following are the functions defined in the header stlib.h −

Cstdlib Dev C 2017

Sr.No.Function & Description
1double atof(const char *str)

Converts the string pointed to, by the argument str to a floating-point number (type double).

2int atoi(const char *str)

Converts the string pointed to, by the argument str to an integer (type int).

3long int atol(const char *str)

Converts the string pointed to, by the argument str to a long integer (type long int).

4double strtod(const char *str, char **endptr)

Converts the string pointed to, by the argument str to a floating-point number (type double).

5long 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).

6unsigned 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).

7void *calloc(size_t nitems, size_t size)

Allocates the requested memory and returns a pointer to it.

8void free(void *ptr

Deallocates the memory previously allocated by a call to calloc, malloc, or realloc.

9void *malloc(size_t size)

Allocates the requested memory and returns a pointer to it.

10void *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.

11void abort(void)

Causes an abnormal program termination.

12int atexit(void (*func)(void))

Causes the specified function func to be called when the program terminates normally.

13void exit(int status)

Causes the program to terminate normally.

14char *getenv(const char *name)

Searches for the environment string pointed to by name and returns the associated value to the string.

15int system(const char *string)

The command specified by string is passed to the host environment to be executed by the command processor.

16void *bsearch(const void *key, const void *base, size_t nitems, size_t size, int (*compar)(const void *, const void *))

Performs a binary search.

17void qsort(void *base, size_t nitems, size_t size, int (*compar)(const void *, const void*))

Sorts an array.

18int abs(int x)

Returns the absolute value of x.

19div_t div(int numer, int denom)

Divides numer (numerator) by denom (denominator).

20long int labs(long int x)

Returns the absolute value of x.

21ldiv_t ldiv(long int numer, long int denom)

Divides numer (numerator) by denom (denominator).

22int rand(void)

Returns a pseudo-random number in the range of 0 to RAND_MAX.

23void srand(unsigned int seed)

This function seeds the random number generator used by the function rand.

24int mblen(const char *str, size_t n)

Returns the length of a multibyte character pointed to by the argument str.

25size_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.

26int mbtowc(whcar_t *pwc, const char *str, size_t n)

Examines the multibyte character pointed to by the argument str.

27size_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.

28int wctomb(char *str, wchar_t wchar)

Examines the code which corresponds to a multibyte character given by the argument wchar.

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