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Practical C#/.Net

Practical C#/.Net

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Please, select the output of the code below:

public class PowersOf2 { static void Main() { foreach (int i in Power(2, 5)) { Console.Write("{0} ", i); } } public static IEnumerable<int> Power(int number, int exponent) { int result = 1; for (int i = 0; i < exponent; i++) { result = result * number; yield return result; } } }

4 8 16 32

2 4 8 16 32

2 32

other

Please, choose the type that can be used as a return type in the declaration of an iterator with yield:

IEnumerable<T>

object

IEnumerator

IEnumerator<T>

IEnumerable

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Please, choose the members of the IEnumerator<T> interface:

Next()

Release()

MoveNext()

MoveBack()

Reset()

Current

Instant

MoveBackwards()

Please, choose what is true about IEnumerable<T> interface:

When you implement IEnumerable<T>, you must also implement IEnumerator<T> or use the yield keyword

✅

Exposes the enumerator, which supports a simple iteration over a collection of a specified type

✅

Contains GetEnumerator() method

✅

IEnumerable<T> inherits from IEnumerable

✅

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Please, choose what will be the result of the execution of the code below:

interface A { void Hello(); } interface B { void Hello(); } class Test : A, B { public void Hello() { Console.WriteLine("Hello to all"); } } static void Main() { Test myTest = new Test(); myTest.Hello(); }

Compilation error: cannot choose interface for method implementation

❌

compilation error: internal class cannot have public members

Hello to all

runtime error

For the code snippet shown below, which of the following statements are valid?

Addition will produce result 1.

❌

Compiler will report an error: Operator '+' is not defined for types T and int.

✅

None of the above.

❌

Program will generate run-time exception.

❌

Result of addition is system-dependent.

❌

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Please, choose what will be the result of the execution of the code below:

interface A { void Hello(); } interface B { void Hello(); } class Test : A, B { void A.Hello() { Console.WriteLine("Hello from A"); } void B.Hello() { Console.WriteLine("Hello from B"); } } static void Main() { Test myTest = new Test(); ((A)myTest).Hello(); }