[Q#9962420][A#9962492] How to get the 'place' of a Number in Java (eg. tens, thousands, etc)

https://stackoverflow.com/q/9962420

How can I determine the number places of a number and determine the number of a loop to run? For example, if i have an array int[] a= {123,342,122,333,9909} and int max = a.getMax() we get the value 9909. I want to get the number place value of 9909, which is the thousand-th place. For example… Here is my code, however it fails when it meets a zero between an integer…

Answer

https://stackoverflow.com/a/9962492

You can use logarithms.

APIzation

double[] values = {4, 77, 234, 4563, 13467, 635789};
    for(int i = 0; i < values.length; i++)
    {
        double tenthPower = Math.floor(Math.log10(values[i]));
        double place = Math.pow(10, tenthPower);
        System.out.println(place);
    }

package com.stackoverflow.api;

public class Human9962492 {

  public static void printPlaces(double[] values) {
    for (int i = 0; i < values.length; i++) {
      double tenthPower = Math.floor(Math.log10(values[i]));
      double place = Math.pow(10, tenthPower);
      System.out.println(place);
    }
  }
}

package com.stackoverflow.api;

/**
 * How to get the 'place' of a Number in Java (eg. tens, thousands, etc)
 *
 * @author APIzator
 * @see <a href="https://stackoverflow.com/a/9962492">https://stackoverflow.com/a/9962492</a>
 */
public class APIzator9962492 {

  public static void getPlace(double[] values) throws Exception {
    for (int i = 0; i < values.length; i++) {
      double tenthPower = Math.floor(Math.log10(values[i]));
      double place = Math.pow(10, tenthPower);
      System.out.println(place);
    }
  }
}