Using online tool CodingBat when solving programming exercises 

The CAWI type has been selected due to poor fit of the remaining categories.
The students were given programming tasks to solve in the self-learning tool CodingBat. There was also the possibility to get help from the tool if necessary.

The CodingBat tasks, which served as an instrument, were as follows:
1.) Given n of 1 or more, return the factorial of n, which is n * (n-1) * (n-2) … 1. Compute the result recursively (without loops).
2.) The fibonacci sequence is a famous bit of mathematics, and it happens to have a recursive definition. The first two values in the sequence are 0 and 1 (essentially 2 base cases). Each subsequent value is the sum of the previous two values, so the whole sequence is: 0, 1, 1, 2, 3, 5, 8, 13, 21 and so on. Define a recursive fibonacci(n) method that returns the nth fibonacci number, with n=0 representing the start of the sequence.

The original tasks are available online:
1) Faculty of n: https://codingbat.com/prob/p154669
2) Fibonacci sequence: https://codingbat.com/prob/p120015