Count Digits of a Number | Write a program in Java to count the digits in a number. | ISC Computer Science | ICSE Computer Applications

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Count Digits of Number

Algorithm

  1.   Start
  2. n:=0
  3. d:=0
  4. Print "Enter a number"
  5. Read n
  6. d=0
  7. If n>0, go to step 8 or else go to step 10
  8. d++
  9. n=n/10
  10. Go to step 7
  11. Print "The number of digits in the given number is "+d
  12. Stop

Program

Buffered Reader

import java.io.*;
class CountDigits
{
    int n,d;
    
    void accept() throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader (System.in));
        System.out.println("Enter a number");
        n=Integer.parseInt(br.readLine());
    }
    
    void count()
    {
        d=0;
        while (n>0)
        {
            d++;
            n=n/10;
        }
    }
    
    void display()
    {
        System.out.println("The number of digits in the given number is "+d);
    }
    
    void main() throws IOException
    {
        accept();
        count();
        display();
    }
}

Scanner

import java.util.*;
class CountDigits
{
    int n,d;
    
    void accept() 
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a number");
        n=sc.nextInt();
    }
    
    void count()
    {
        d=0;
        while (n>0)
        {
            d++;
            n=n/10;
        }
    }
    
    void display()
    {
        System.out.println("The number of digits in the given number is "+d);
    }
    
    void main() 
    {
        accept();
        count();
        display();
    }
}

Documentation

Variable Description

Data Type Variable NameDescription
 intn To store the number entered by the user 
 intd To store the number of digits in the number 

Method Description

Return Type Method NameDescription
 voidaccept() To accept data from the user  
 voidcount() To count the number of digits in a number 
 voiddisplay() To display the result of the program 
 voidmain() To act as an entry gateway for the compiler  

Output

Output of Digit Count





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