Count the Digit

Write a function $count\_digit(d, n)$ that receives a single digit $d$ (non-negative integer less than 10) and a positive integer $n$ and returns the number of occurrences of digit $d$ in $n$ .

Observation

All integers are assumed written in the usual base 10.

Problem information

Author: Jordi Delgado & José Luis Balcázar

Generation: 2026-01-25T15:56:51.601Z