extern int strcmp(const char *,const char *);
extern int strncmp(const char *,const char *,size_t);
extern int strnicmp(const char *, const char *, size_t);
extern int strcmp(const char *,const char *);
extern int strncmp(const char *,const char *,size_t);
extern int strnicmp(const char *, const char *, size_t);