get number of digits in an integer java code example

Example 1: how to get length of integer in java

int length = (int) (Math.log10(number) + 1);

Example 2: how to convert int into int array of digits in java

String temp = Integer.toString(guess);
int[] newGuess = new int[temp.length()];
for (int i = 0; i < temp.length(); i++)
{
    newGuess[i] = temp.charAt(i) - '0';
}

Example 3: count the number of digits in an integer in java

import java.util.Scanner;
public class CountingDigitsInInteger {
   public static void main(String args[]){
      Scanner sc = new Scanner(System.in);
      int count = 0;
      System.out.println("Enter a number ::");
      int num = sc.nextInt();
      while(num!=0){
         num = num/10;
         count++;
      }
      System.out.println("Number of digits in the entered integer are :: "+count);
   }
}

Example 4: to get sum of even digits java

//To find the sum of even digits in a given Number

    public static int getEvenDigitSum(int number){
        if(number<0){
            return -1;
        }
        int finalNumber=0;
        while(number>0){
           if((number%10)%2==0){
               finalNumber+=number%10;

           }
           number=number/10; //takes out last digit to test the next digit


        }
        return finalNumber;
    }
//Output: ex:number=12323 -- Ans: 4

Example 5: how to get length of integer in java

int length = 0;
long temp = 1;
while (temp <= number) {
    length++;
    temp *= 10;
}
return length;