Prepared By : Uday Shah - HOD (IT)
Contact No : 7600044051
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abs()
The C library function int
abs(int x) returns the
absolute value of int x.
Following is the declaration for abs() function.
int abs(int x)
x is the integral
value. This function
returns the absolute value of x.
atof()
The C library function double
atof(const char *str) converts
the string argument str to a floating-point number (type
double). Following is the declaration for atof() function.
double atof(const char *str)
str is the string having the representation of a
floating-point number. This
function returns the converted floating point number as a double value. If no
valid conversion could be performed, it returns zero (0.0).
atol()
The C library function long
int atol(const char *str) converts
the string argument str to a long integer (type long int).
Following is the declaration for atol() function.
long int atol(const char *str)
str is the string containing the representation of an
integral number. This
function returns the converted integral number as a long int. If no valid
conversion could be performed, it returns zero.
exit()
The C library function void
exit(int status) terminates
the calling process immediately. Following is the declaration for exit()
function.
void exit(int status)
status is the status value returned to the parent process. This function does not return any
value.
free()
The C library function void
free(void *ptr) deallocates
the memory previously allocated by a call to calloc, malloc, or realloc.
Following is the declaration for free() function.
void free(void *ptr)
ptr is the pointer to a memory block previously allocated
with malloc, calloc or realloc to be deallocated. If a null pointer is passed
as argument, no action occurs. This function does not return any value.
rand()
The C library function int
rand(void) returns a
pseudo-random number in the range of 0 to RAND_MAX.
RAND_MAX is a constant whose default value may vary between implementations but
it is granted to be at least 32767. Following is the declaration for rand()
function.
int rand(void)
This function returns an integer value between 0 and RAND_MAX.
Strtoul()
The C library function unsigned
long int strtoul(const char *str, char **endptr, int base) function converts the initial part of
the string in str to an unsigned long int value
according to the given base,
which must be between 2 and 36 inclusive, or be the special value 0. Following
is the declaration for strtoul() function.
unsigned long int strtoul(const char *str, char **endptr, int base)
str is the string containing the
representation of an unsigned integral number. endptr is the reference to an object of type
char*, whose value is set by the function to the next character in str after
the numerical value. base
is the base, which must be between 2 and 36 inclusive, or be the special value
0.
This function returns the converted integral number as a long int
value. If no valid conversion could be performed, a zero value is returned.
srand()
The C library function void
srand(unsigned int seed) seeds
the random number generator used by the function rand. Following is the
declaration for srand() function.
void srand(unsigned int seed)
seed is an integer value to be used as seed
by the pseudo-random number generator algorithm. This function does not return
any value.
labs()
The C library function long int labs(long int x) returns the absolute value ofx. Following is the declaration for labs() function.
long int labs(long int x)
x is the integral value. This function returns the absolute value of x.
qsort()
The C library function void qsort(void *base, size_t nitems, size_t size, int (*compar)(const void *, const void*)) sorts an array. Following is the declaration for qsort() function.
void qsort(void *base, size_t nitems, size_t size, int (*compar)(const void *, const void*))
base is the pointer to the first element of the array to be sorted. nitems is the number of elements in the array pointed by base size is the size in bytes of each element in the array. compar is the function that compares two elements. This function does not return any value.
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