C#: Count the number of digits in a number

Last update on December 20 2024 12:43:12 (UTC/GMT +8 hours)

Write a program in C# Sharp to count the number of digits in a number using recursion.

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Sample Solution:

C# Sharp Code:

using System;

// Class definition named 'RecExercise5'
class RecExercise5
{
    // Main method, the entry point of the program
    static void Main(string[] args)
    {
        // Display a description of the program
        Console.Write("\n\n Recursion : Count the number of digits in a number :\n");
        Console.Write("---------------------------------------------------------\n");
        Console.Write(" Input any number : ");
        int num = Convert.ToInt32(Console.ReadLine()); // Read user input for the number

        // Display the number of digits in the entered number
        Console.Write("\n The number {0} contains number of digits : {1} ", num, getDigits(num, 0));
        Console.ReadLine();
    }

    // Recursive function to count the number of digits in a number
    public static int getDigits(int n1, int nodigits)
    {
        // Base case: if the number becomes zero, return the count of digits
        if (n1 == 0)
            return nodigits;

        // Recursive call: getDigits method is called with the quotient of the number divided by 10 and the incremented count of digits
        return getDigits(n1 / 10, ++nodigits);
    }
}

Sample Output:

 Recursion : Count the number of digits in a number :                                                         
---------------------------------------------------------                                                     
 Input any number : 1000                                                                                      
                                                                                                              
 The number 1000 contains number of digits : 4

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