Picat Imperative Programming Constructs Questions and Answers

Question 1

Which of the following Picat operators is used for destructive assignment of a value to a variable within an imperative loop?

Accepted Answer

:=

Answer

=

Answer

==

Answer

=>

Question 2

What is the output of the following Picat code snippet?

main =>
    Counter = 4,
    Result = 1,
    while (Counter > 1)
        Result := Result * Counter,
        Counter := Counter - 1
    end,
    println(Result).

Accepted Answer

24

Answer

1

Answer

10

Answer

0

Question 3

Consider the following Picat code. What value will be printed to the console?

main =>
    S = 0,
    foreach (X in [10, 5, 3])
        S := S + X
    end,
    println(S).

Accepted Answer

18

Answer

15

Answer

0

Answer

3

Question 4

Which of the following imperative constructs in Picat is used to mark the end of a block for loops (`while`, `foreach`) and conditionals (`if-then-else`)?

Accepted Answer

end

Answer

stop

Answer

fi

Answer

done

Question 5

A developer writes the following code, intending to set a variable `Status` based on a `Score`. What is the final value of `Status`?

main =>
    Score = 85,
    Status = '',
    if (Score >= 90) then
        Status := high
    elseif (Score >= 70) then
        Status := medium
    else
        Status := low
    end,
    println(Status).

Accepted Answer

medium

Answer

high

Answer

low

Question 6

Which of the following Picat code snippets will result in an instantiation error?

Accepted Answer

main =>
    while (N > 0)
        N := N - 1
    end,
    println(N).

Answer

main =>
    X = 1,
    Y = X + 5,
    println(Y).

Answer

main =>
    foreach(I in 1..5)
        X = I*I,
        println(X)
    end.

Answer

main =>
    X = 10,
    if (X > 5) then
        println(ok)
    end.