scr_clear 103 usr/sample/tetris/screen.c scr_clear(); scr_clear 35 usr/sample/tetris/screen.h void scr_clear(void); scr_clear 268 usr/sample/tetris/tetris.c scr_clear(); scr_clear 271 usr/sample/tetris/tetris.c scr_clear(); scr_clear 282 usr/sample/tetris/tetris.c scr_clear();