void lcd::set_upper_order_bit(unsigned char data)
{
set_b4(data & 0x01);
set_b5(data & 0x02);
set_b6(data & 0x04);
set_b7(data & 0x08);
}
double rk_main(double alpha,double epsilon,double h_init){
double x=0,y=1,y4,y5,h=h_init;
double a[6][6],b5[6],b4[6],c[6];
set_a(a);
set_b4(b4);
set_b5(b5);
set_c(c);
printf("#\t%s\t%s\t%s\t%s\n","x","y","h","dy/dx");
while(x<10.0){
rk_step(x,y,h,a,b4,c,&y4);
rk_step(x,y,h,a,b5,c,&y5);
if(y4-y5<epsilon){
printf("\t%f\t%f\t%e\t%f\n",x,y,h,f(x));
x+=h;
y=y5;
h=alpha*h*pow(epsilon/fabs(y4-y5),0.2);
}else{
h=h/2;
}
}
return y;
}