Utility Functions:

Utility Functions:

double atof(const char *s)
int atoi(const char *s
long atol(const char *s)
double strrod(const char *s, char **endp)
long strtol(const char *s, char **endp, int base)
unsigned long strtoul(const char *s, char **endp, int base)
int rand(void)
void srand(unsigned int seed)
void *calloc(size_t nobj, size_t size)
void *malloc(size_t size)
void *realloc(void *p, size_t size)
void free(void *p)
void abort(void)
void exit(int status)
int atexit(void (*fcn)(void))
int system(const char *s)
char *getenv(const char *name)
void *bsearch(const void *key, const void *base, size_t n, size_t size, int (*cmp)(const void *keyval, const void *datum))
void qsort(void *base, size_t n, size_t size, int (*cmp)(const void *, const void *))
int abs(int n)
long labs(long n)
div_t div(int num, int denom)
ldiv_t ldiv(long num , long denom)