p7fet2yns/function.java

public static double function(double x,int n){
	if(x==0)
	{
		return 0.0;
	}
	if(n>0)
	{
		return Pow(x,n);
	}
	else
	{
		return 1/Pow(x,-n);
	}
}
public static double Pow(double x,int n){
	if(n==0)
		return 1;
	double tem=Pow(x,n/2);
	if(n%2==0)
	{
		return tem*tem;
	}
	else{
		return tem*tem*x;
	}
}