Picat Using Standard Modules 3

Question 1

What is the correct way to open a file for writing in Picat using the `io` module?

Accepted Answer

open(File, write, Stream)

Answer

`open/3` takes the filename, mode atom (`write`, `read`, or `append`), and binds a stream variable.

Question 2

Which `sets` module predicate computes the union of two sets represented as sorted lists?

Accepted Answer

union/3

Answer

`union/3` in the `sets` module takes two sorted lists and produces their union as a sorted list.

Question 3

In Picat's `math` module, which predicate computes the base-10 logarithm?

Accepted Answer

log10/1

Answer

`log10/1` computes the base-10 (common) logarithm, while `log/1` computes the natural logarithm.

Question 4

Which `string` module function splits a string by a delimiter character?

Accepted Answer

split/2

Answer

`split/2` takes a string and a delimiter string, returning a list of substrings.

Question 5

What does `:- import lists, sets.` accomplish in a Picat file?

Accepted Answer

Imports both the `lists` and `sets` modules

Answer

Multiple modules can be imported in a single `:- import` directive by separating them with commas.

Picat Practice Test