diff --git a/log.java b/log.java
new file mode 100644
index 0000000..c9c613b
--- /dev/null
+++ b/log.java
@@ -0,0 +1,23 @@
+package calculator;
+import java.util.Scanner;
+public class log {
+	
+		public log() {
+			Scanner sc = new Scanner(System.in);
+			System.out.println("请输入底数a");
+			double a = sc.nextDouble();
+			System.out.println("请输入真数x");
+			double x = sc.nextDouble();
+			if(x>0&&a>0&&a!=1)
+			{
+				double result = log(a,x);
+			    System.out.println("结果为:"+result);
+			}
+			else
+			System.out.println("errors ");
+		}
+
+		public static double log(double a, double x){
+			return Math.log(x) / Math.log(a);
+		}
+}