-/* cliprect.c */
-int cliprect(double *x1, double *y1, double *x2, double *y2, const double rect[4]);
-/* lnearest.c */
-long int lnearest(double x);
-/* mtx_disp.c */
-void mtx_show(const MTX *mtx);
-void mtx_prt(const MTX *mtx, FILE *fp);
-int mtx_prt_elem(const MTX *mtx, FILE *fp, unsigned int x, unsigned int y, unsigned int z);
-/* mtx_elem.c */
-int mtx_get_elem(const MTX *mtx, MTX_ELEM_VAL *me, const int x, const int y, const int z);
-int mtx_put_elem(MTX *mtx, const MTX_ELEM_VAL *me, unsigned int x, unsigned int y, unsigned int z);
-/* mtx_inp.c */
-int mtx_inp_elem(const char *prompt, MTX_ELEM_VAL *mev, const int dtype);
-/* mtx_main.c */
-MTX *mtx_init(const unsigned int order, const unsigned int elem_type, const unsigned int nx, const unsigned int ny, const unsigned int nz);
-MTX *mtx_clr(MTX *mtx);
-int mtx_free(MTX *mtx);
-int mtx_elem_size(const int dt);
-int mtx_check(const MTX *mtx, const char *func_name);