class cordicAproximation{
private int precision;
private double theta;
public cordicAproximation(double theta, int precision){
this.theta=theta;
this.precision=precision;
}
public double getK(){
double result=1;
for(int i=0;i<precision;i++){
result=result*Math.sqrt(1+Math.pow(2,(-2*i)));
}
return result;
}
public double getCos(){
double x=1/getK();
double y=0;
double z=theta;
for(int i=0;i<precision;i++){
if(z>=0){
double tmp=x;
x=x-(Math.pow(2,-i)*y);
y=y+(Math.pow(2,-i)*tmp);
z=z-Math.atan(Math.pow(2,-i));
}
else{
double tmp=x;
x=x+(Math.pow(2,-i)*y);
y=y-(Math.pow(2,-i)*tmp);
z=z+Math.atan(Math.pow(2,-i));
}
}
return x;
}
public double libraryCos(){
return Math.cos(theta);
}
public double getError(){
return Math.abs(getCos()-libraryCos());
}
public String toString(){
return "Cordic cos: "+getCos()+"\nLibrary cos: "+libraryCos() +"\nError: "+getError();
}
}
public class Main {
public static void main(String args[]) {
cordicAproximation cordic=new cordicAproximation(Math.PI/6,5);
System.out.println(cordic);
}
}