Program to count the digits of a given number using recursion in C++.

Solution :

#include <iostream>

using namespace std;

int CountD(int n) {
  static int count=0;
  if (n > 0)
    {
        count++;
        CountD(n/10);
    }
   return count;
}

int main()
{
    int n, ans;
    cout<<"Enter a Number :- ";
    cin>>n;
    ans=CountD(n);
    cout<<"Total Number of Digits are :- "<<ans;
    return 0;
}

Output :

Enter a Number :- 153
Total Number of Digits are :- 3