Picat Data Structures and Types 3

Question 1

In Picat, what type does the literal `"hello"` (double-quoted) have?

Accepted Answer

String — its own distinct type

Answer

In Picat, double-quoted literals are of the `string` type, which is distinct from atoms and lists.

Question 2

Which predicate tests if X is a Picat string (double-quoted value)?

Accepted Answer

string(X)

Answer

`string(X)` succeeds when X is a Picat string literal (double-quoted), distinguishing it from atoms.

Question 3

How do you convert integer N to its atom representation in Picat?

Accepted Answer

to_atom(N)

Answer

`to_atom(N)` converts any Picat term including integers to its atom representation.

Question 4

What does `string_codes("ab", Cs)` bind Cs to in Picat?

Accepted Answer

[97, 98]

Answer

`string_codes/2` converts a string to a list of Unicode code points; 97 = 'a' and 98 = 'b'.

Question 5

What does `atom_length(hello, N)` bind N to in Picat?

Accepted Answer

5

Answer

`atom_length/2` counts the characters in the atom's name; 'hello' has 5 characters.

Picat Practice Test