C++ Exercises: Find the frequency of each digit in a given integer

Last update on April 07 2025 12:59:24 (UTC/GMT +8 hours)

59. Frequency of Each Digit in an Integer

Write a program in C++ to find the frequency of each digit in a given integer.

Visual Presentation:

Sample Solution:-

C++ Code :

#include <iostream> // Include the input/output stream library
using namespace std; // Using standard namespace

int main() // Main function where the execution of the program starts
{
    int n, i, j, ctr, r; // Declare integer variables n, i, j, ctr, and r

    // Display message asking for input
    cout << "\n\n Find frequency of each digit in a given integer:\n";
    cout << "-----------------------------------------------------\n";
    cout << " Input any number: ";
    cin >> n; // Read input for the number from the user

    // Loop through each digit from 0 to 9 to find their frequency
    for (i = 0; i < 10; i++) 
    {
        cout << "The frequency of " << i << " = "; // Display the current digit

        ctr = 0; // Initialize the counter for the current digit's frequency

        // Loop through the number to count occurrences of the current digit
        for (j = n; j < 0; j = j / 10) 
        {
            r = j % 10; // Extract the last digit of the number

            if (r == i) // Check if the extracted digit is equal to the current digit being checked
            {
                ctr++; // Increment the counter for the current digit's frequency
            }
        }

        // Display the frequency of the current digit
        cout << ctr << endl;
    }
}

Sample Output:

 Find frequency of each digit in a given integer:                      
-----------------------------------------------------                  
 Input any number: 122345                                              
The frequency of 0 = 0                                                 
The frequency of 1 = 1                                                 
The frequency of 2 = 2                                                 
The frequency of 3 = 1                                                 
The frequency of 4 = 1                                                 
The frequency of 5 = 1                                                 
The frequency of 6 = 0                                                 
The frequency of 7 = 0                                                 
The frequency of 8 = 0                                                 
The frequency of 9 = 0

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to count and display the frequency of each digit (0-9) in a given integer.
• Write a C++ program that reads an integer, converts it to a string, and uses an array to track the count of each digit.
• Write a C++ program to iterate through the digits of a number and print the frequency for each digit from 0 to 9.
• Write a C++ program that processes an input number and outputs a formatted report of how many times each digit appears.

C++ Code Editor:

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