diff --git a/function.java b/function.java
new file mode 100644
index 0000000..92d62da
--- /dev/null
+++ b/function.java
@@ -0,0 +1,26 @@
+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;
+	}
+}