int fgetc(FILE *stream);
int fputc(int c, FILE *stream);
char fgets(char *s, int n, FILE *stream);
int fputs(const char *s, FILE *stream);
int fprintf(FILE *stream, const char *format, …);
int fscanf(FILE *stream, const char *format, …);
size_t fread(void *ptr, size_t size, size_t n, FILE *stream);
size_t fwrite(const void *ptr, size_t size, size_t n, FILE *stream);
int fgetops(FILE *stream, fpos_t *pos);
int fsetpos(FILE *stream, const fpos_t *pos);
int fseek(FILE *stream, long offset, int whence);