Java Program to Count Total Digits in a Number

In the previous article, we have seen Java Program to Calculate nPr

In this article we will see how to count total number of digits in a number using java programming language.

Java Program to Count Total Digits in a Number

As we know from 0 to 9 are called as digits and a number is a combination of multiple digits. So our task is to count total number of digits are used in a given number.

Example:

Number= 9034, Total number of digits= 4
Number= 786, Total number of digits= 3
Number= 89, Total number of digits=2

Let’s see different ways to count total number of digits in a number.

By Using Static Input Value
By Using User Input Value
By Using User Defined Method

Method-1: Java Program to Count Total Digits in a Number By Using Static Input Value

Approach:

Declare an integer variable ‘number‘ and initialize the value.
Declare an integer variable ‘numberOfDigit‘ and initialize it to 0.
Inside while loop divide the number by 10 and increment the value of numberOfDigit by 1.
Continue the loop till ‘number‘ value becomes 0.
Now after the while loop completes the value of ‘numberOfDigit‘ represents total number of digits in the given number.

Program:

public class Main 
{
   public static void main(String args[])
   {
      //initializing integer variable 'numberOfDigit' to 0
      int numberOfDigit = 0;
      
      //a number declared
      int number = 63365;

      //assigning the value of 'number' to an integer variable 'tmp'
      int temp=number;
      
      //countinue the loop till the number becomes 0
      while(number!=0)
      {
          //Dividing the number with 10 
         number = number/10;
         //incrementing the value of 'numberOfDigit'
         numberOfDigit++;
      }
      System.out.println("Total number of digits in " +temp+ " are "+ numberOfDigit);
   }
}

Output:

Total number of digits in 63365 are 5

Method-2: Java Program to Count Total Digits in a Number By Using User Input Value

Approach:

Declare an integer variable ‘number‘ and take the value as user input.
Declare an integer variable ‘numberOfDigit‘ and initialize it to 0.
Inside while loop divide the number by 10 and increment the value of numberOfDigit by 1.
Continue the loop till ‘number‘ value becomes 0.
Now after the while loop completes the value of ‘numberOfDigit‘ represents total number of digits in the given number.

Program:

import java.util.Scanner;

public class Main 
{
   public static void main(String args[])
   {
      //Scanner class object created
      Scanner sc = new Scanner(System.in);
      //initializing integer variable 'numberOfDigit' to 0
      int numberOfDigit = 0;
      
      System.out.println("Enter a number :");
      int number = sc.nextInt();
      
      //assigning the value of 'number' to an integer variable 'tmp'
      int temp=number;
      
      //countinue the loop till the number becomes 0
      while(number!=0)
      {
          //Dividing the number with 10 
         number = number/10;
         //incrementing the value of 'numberOfDigit'
         numberOfDigit++;
      }
      System.out.println("Total number of digits in " +temp+ " are "+ numberOfDigit);
   }
}

Output:

Enter a number :
893450
Total number of digits in 893450 are 6

Method-3: Java Program to Count Total Digits in a Number By Using User Defined Method

Approach:

Declare an integer variable ‘number‘ and take the value as user input.
Declare an integer variable ‘numberOfDigit‘ and initialize it to 0.
Call a user defined method countDigit() by passing the number as parameter.
Inside the method take a while loop and inside loop divide the number by 10 and increment the value of numberOfDigit by 1.
Continue the loop till ‘number‘ value becomes 0.
Now after the while loop completes the value of ‘numberOfDigit‘ represents total number of digits in the given number.

Program:

import java.util.Scanner;

public class Main 
{
   public static void main(String args[])
   {
      //Scanner class object created
      Scanner sc = new Scanner(System.in);
      
      System.out.println("Enter a number :");
      int number = sc.nextInt();
      //callling a user defined method countDigit()
      countDigit(number);
   }
   
   public static void countDigit(int number)
   {
      //initializing integer variable 'numberOfDigit' to 0
      int numberOfDigit = 0;
      
      //assigning the value of 'number' to an integer variable 'tmp'
      int temp=number;
      
      //countinue the loop till the number becomes 0
      while(number!=0)
      {
          //Dividing the number with 10 
         number = number/10;
         //incrementing the value of 'numberOfDigit'
         numberOfDigit++;
      }
      System.out.println("Total number of digits in " +temp+ " are "+ numberOfDigit);
   }
}

Output:

Enter a number :
657
Total number of digits in 657 are 3

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