How do I write the code to this?

15 #include 16 #include 17 18 using namespace std; 19 20 /** 21 Requires: (1) num > 0 22 (2) num has no leading zeros 23 (3) 0 133 % 10 = 3 = rightmost digit of 133 is 3 * * * 36 37 38 39 2. 133 / 10 = 13 --> 13 % 10 = 3 = next digit of 133 is 3 3. 133 / 100 = 1 --> 1 % 10 = 1 = next digit of 133 is 1 4. 133 / 1000 = 0 --> no additional digits in 133 **/ int calculateFrequency(int num, int d) { // TODO: implement | // NOTE: return 0 to avoid compile error // remove it after implementing return 0