diff --git a/b.java b/b.java
new file mode 100644
index 0000000..fc43d09
--- /dev/null
+++ b/b.java
@@ -0,0 +1,20 @@
+//package log;
+import java.util.Scanner;
+public class b {
+    public static void main(String[] args) {
+    	int a;
+    	int x;
+    	double result;
+    	System.out.println("输入底数a(a>0且a！=1):");
+    	Scanner sc = new Scanner(System.in);
+    	a=sc.nextInt();		
+    	System.out.println("输入真数x:");
+    	x=sc.nextInt();		
+        result = log(x, a);
+        System.out.println(result);
+    }
+ 
+    private static double log(double value, double base) {
+        return Math.log10(value) / Math.log10(base);
+    }
+}