Occurrence of a digit in a given number using Java

October 1, 2022

Occurrence of a X in a number using Java

Occurrence of a digit in a given number using Java

In this page we will discuss the program to find the occurrence of a digit in a given number using java programming language. We are given with a number and a digit and need to count the number of occurrence of that digit in the given number.

Method Discussed :

  • Method 1 : Using loops.
  • Method 2 : Using string.

Method 1 :

  • Declare variable count that will count the required number of occurrences
  • Take a while loop.
  • Declare a variable rem to store every digit of the number to be compared.
  • Compare rem with the digit
    • if rem equals digit increment count.
  • n=n/10
  • Print the value of count.

Method 1 : Code in java

Run 
//Write a program to print the Occurrence of a Digit in a given Number in Java
import java.io.*;
import java.util.*;

class Main{

    public static void main (String[] args) 

    {
 
        int n = 898989, count = 0;

        int d = 9;

        while(n>0){
            int rem = n%10;
            if(rem == d)
                count++;
            n /= 10;
        }
        System.out.println(count);

    }

}

Output:

3

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Method 2 :

  •  Declare a variable count = 0, to count the required occurrence.
  • Take a for loop.
  • Declare a variable i to iterate over every character of string.
  • Compare each character with the digit
    • if  character equals digit increment count.
  • Print the value of count.
  • End

Method 2 : Code in java

Run 
//Write a program to print the Occurrence of a Digit in a given Number in Java
import java.io.*;
import java.util.*;

class Main{

    public static void main (String[] args) 

    {
 
        int x = 898989, c = 0;

        char b = '9';

        String s = Integer.toString(x);

        for(int i=0;i<s.length();i++){

            if(s.charAt(i)==b)
                c=c+1;
        }
        System.out.println(c);

    }

}

Output:

3

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