A possible CodeRunner question of the type "Write a function" could be the following.

Write a function calc$($num$)$ which tests if a given positive number num is a prime number or not.

If it is a prime number, the function must return the value $0.$

If it is not a prime number, the function must return $1.$

Your code is automatically checked with several test cases. Two of them are listed here with the expected result.

For example:

Test Result

a $=$ calc$(5)$

print$($a$)$

$0$

a $=$ calc$(8)$

print$($a$)$

$1$

Answer:$($penalty regime: $0\%)$