Question

How to write a recursive function that counts digits of a numbers in C#

Answer 1

using System;
 
class CRecursiveCountDigits
{
    static void Main(string[] args)
    {
        int n = 12345;

        Console.WriteLine(RecursiveCountDigits(n)); // 5

        n = 1234;
        Console.WriteLine(RecursiveCountDigits(n)); // 4

        n = 123;
        Console.WriteLine(RecursiveCountDigits(n)); // 3
 
        n = 1234567;
        Console.WriteLine(RecursiveCountDigits(n)); // 7
    }

    public static int RecursiveCountDigits(int n) {
        if (n == 0) {
            return 0;
        }
        
        return 1 + RecursiveCountDigits(n / 10);
    }
}


 
/*
run:
 
5
4
3
7
 
*/

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