I actually didn't understood what I had to do until I read this. Thank you.

Yup it's a nice enough task but those instructions could be clearer. Thanks for your post though, I thought I was being a bit slow.

The instructions are bordering on gibberish.

It could be:

"Create a function nbDig(int n, int d) which counts the number of occurences of the digit 'd' in the sequence of square numbers from 1 to n."

Oh, so it was simply a matter of switching the names.

Thank you.

I tried your solution and got this error:

Joe greets Kate
expected: "Hi Kate, my name is Joe"
 but got: "Hi Joe , my name is Kate"