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B.java

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+package logax;
+import java.util.Scanner;
+
+public class B {
+	static public class Logarithm {
+		  static public double log(double a, double x) {
+			   return Math.log(a) / Math.log(x);
+		   }
+	}
+
+	public static void main(String[] args) {
+		
+		
+		         Scanner sc = new Scanner(System.in); 
+		         
+		         System.out.println("a="); 
+		         int a = sc.nextInt(); 
+		         System.out.println("x="); 
+		         int x = sc.nextInt();
+		        
+		         System.out.println("logax="+Logarithm.log(a,x)); 
+		
+
+	}
+
+}