stdlib.h

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extern void _Exit(int ret);
extern long a64l(const char *val);
extern void abort(void);
extern int abs(int val);
extern int atexit(void (*func)(void));

extern double atof(const char *str);
extern int atoi(const char *nptr);
extern long atol(const char *nptr);
extern long long atoll(const char *nptr);
extern long long atoq(const char *nptr);
extern void *bsearch(const void *key, const void *base, size_t nmemb, size_t size,
                                                int (*compar)(const void *, const void *));
extern void *calloc(size_t nmemb, size_t size);

extern double drand48(void);
extern double erand48(unsigned short xsubi[3]);
extern void exit(int ret);
extern void free(void *buf);
extern char *getenv(const char *name);
extern int getsubopt(char **optionp, char * const *tokens, char **valuep);
extern int grantpt(int fd);
extern char *initstate(unsigned seed, char *state, size_t n);
extern long jrand48(unsigned short xsubi[3]);
extern char *l64a(long value);
extern long labs(long int j);
extern void lcong48(unsigned short param[7]);

extern long long llabs(long long);
extern long lrand48(void);
extern void *malloc(size_t size);

extern int setenv(const char *name, const char *value, int overwrite);
extern char *getenv(const char *name);

extern int posix_memalign(void **memptr, size_t alignment, size_t size);

extern long int strtol(const char *nptr, char **endptr, int base);
extern long long int strtoll(const char *nptr, char **endptr, int base);
extern unsigned long int strtoul(const char *nptr, char **endptr, int base);
extern unsigned long long int strtoull(const char *nptr, char **endptr,
                                                     int base);