void fade_out(WINDOW *window, int trans, int colors, int invert);
void fade_in(WINDOW *window, int trans, int colors, int invert);
int int_length (int val);
void fade_out(WINDOW *window, int trans, int colors, int invert);
void fade_in(WINDOW *window, int trans, int colors, int invert);
int int_length (int val);