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Find the frequency of a digit in a number

Last Updated : 13 Mar, 2023
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Given a number N and a digit D. Write a program to find how many times the digit D appears in the number N.

Examples : 

Input: N = 1122322  ,  D = 2
Output: 4

Input: N = 346488  ,  D = 9
Output: 0

The idea to solve this problem is to keep extracting digits from the number N and check the extracted digits with the given digit D. If the extracted digit is equals to the digit D then increment the count. 

Below is the implementation of above approach. 

C++




// C++ program to find the frequency
// of a digit in a number
#include <bits/stdc++.h>
using namespace std;
  
// function to find frequency of digit 
// in a number
int frequencyDigits(int n, int d)
{   
    // Counter variable to store
    // the frequency
    int c = 0;
      
    // iterate till number reduces to zero
    while (n > 0) {
          
        // check for equality
        if (n % 10 == d)
            c++;
        // reduce the number
        n = n / 10;
    }
      
    return c;
}
  
// Driver Code
int main()
{
      
    // input number N
    int N = 1122322;
      
    // input digit D
    int D = 2;
      
    cout<<frequencyDigits(N,D);
  
    return 0;
}


Java




// Java program to find 
// the frequency of a 
// digit in a number
class GFG
{
  
// function to find frequency 
// of digit in a number
static int frequencyDigits(int n, 
                           int d)
    // Counter variable to 
    // store the frequency
    int c = 0;
      
    // iterate till number
    // reduces to zero
    while (n > 0
    {
          
        // check for equality
        if (n % 10 == d)
            c++;
        // reduce the number
        n = n / 10;
    }
    return c;
}
  
// Driver Code
public static void main(String args[])
{
      
    // input number N
    int N = 1122322;
      
    // input digit D
    int D = 2;
      
    System.out.println(frequencyDigits(N, D));
}
}
  
// This code is contributed by Arnab Kundu


Python3




# Python3 program to find the 
# frequency of a digit in a number
  
# function to find frequency
# of digit in a number
def frequencyDigits(n, d):
      
    # Counter variable to 
    # store the frequency
    c = 0;
      
    # iterate till number
    # reduces to zero
    while (n > 0): 
          
        # check for equality
        if (n % 10 == d):
            c += 1;
        # reduce the number
        n = int(n / 10);
  
    return c;
  
# Driver Code
  
# input number N
N = 1122322;
  
# input digit D
D = 2;
  
print(frequencyDigits(N, D));
  
# This code is contributed by mits


C#




// C# program to find the frequency
// of a digit in a number
using System;
  
class GFG
{
  
// function to find frequency 
// of digit in a number
static int frequencyDigits(int n, 
                           int d)
    // Counter variable to 
    // store the frequency
    int c = 0;
      
    // iterate till number
    // reduces to zero
    while (n > 0) 
    {
          
        // check for equality
        if (n % 10 == d)
            c++;
        // reduce the number
        n = n / 10;
    }
    return c;
}
  
// Driver Code
static public void Main(String []args)
{
      
    // input number N
    int N = 1122322;
      
    // input digit D
    int D = 2;
      
    Console.WriteLine(frequencyDigits(N, D));
  
}
}
  
// This code is contributed by Arnab Kundu


PHP




<?php
// PHP program to find the frequency
// of a digit in a number
  
// function to find frequency
// of digit  in a number
function frequencyDigits($n, $d)
    // Counter variable to 
    // store the frequency
    $c = 0;
      
    // iterate till number
    // reduces to zero
    while ($n > 0) 
    {
          
        // check for equality
        if ($n % 10 == $d)
            $c++;
        // reduce the number
        $n = $n / 10;
    }
      
    return $c;
}
  
// Driver Code
  
// input number N
$N = 1122322;
  
// input digit D
$D = 2;
  
echo frequencyDigits($N, $D);
  
// This code is contributed by mits
?>


Javascript




<script>
  
// Javascript program to find 
// the frequency of a 
// digit in a number
  
// Function to find frequency 
// of digit in a number
function frequencyDigits(n, d)
      
    // Counter variable to 
    // store the frequency
    var c = 0;
      
    // Iterate till number
    // reduces to zero
    while (n > 0) 
    {
          
        // Check for equality
        if (n % 10 == d)
            c++;
              
        // Reduce the number
        n = parseInt(n / 10);
    }
    return c;
}
  
// Driver code
  
// input number N
var N = 1122322;
  
// input digit D
var D = 2;
  
document.write(frequencyDigits(N, D));
  
// This code is contributed by Khushboogoyal499
  
</script>


Output : 

4

 

Time Complexity: O(log10N)
Auxiliary Space: O(1)



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