diff --git a/fengshiji1.java b/fengshiji1.java
index b59c362..b4ef4de 100644
--- a/fengshiji1.java
+++ b/fengshiji1.java
@@ -1,5 +1,16 @@
 package fengshiji;
+import  java.math.*;
+public class fengshiji1 
+{
+	public double duishu(double a,double b)
+	{
+		double res = log(a, b);
+	return res;
+	}
 
-public class fengshiji1 {
+	private double log(double a, double b) {
+		double h=Math.log10(b)/Math.log10(a);
+		return h;
+	}
 
 }