java - find out the log value of a number from input -

i have edittext field users input. user can enter values ten digit number.when clicking on button, need show log [ mathematics log ] value of number in double precision.

that showned below.
if input xxxxxxxxxx [ consider number ]
the output must yy.yy.

package com.example.logvalue; import android.os.bundle; import android.app.activity; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.toast;  public class main extends activity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);       edittext edit = (edittext) findviewbyid(r.id.edittext1);       final int noo = integer.parseint(edit.gettext().tostring());        button b1 = (button) findviewbyid(r.id.button1);         b1.setonclicklistener(new onclicklistener() {             public void onclick(view arg0) {         toast.maketext(main.this, string.format("%.2f", math.log10(noo)) , toast.length_long).show();             }         });        }   } 

use string.format("%.2f", math.log10(number)) syntax. string class has format function these.

i assume want logarithm base of 10.

explanation: string.format java-equavalient of traditional printf c++. % symbol means there fetched argument list, point means want specify number of decimals, , hence put 2 after point. hope helped.