gs gs108 Reflections, Multithreaded Programming, Collection Classes and Mathematical Functions - Iterators - Quiz No.1
gs gs108 CSharp Quiz
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Question 1: What is an iterator?
a method
an operator
accessor
all of the mentioned
Question 2: What will be the output of the following C# code snippet?
class MyClass { char[] chrs = { 'A', 'B', 'C', 'D' }; public System.Collections.IEnumerator GetEnumerator() { foreach (char ch in chrs) yield return ch; } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (char ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } }
Run time error
Compile time error
Code runs successfully prints nothing
Code runs successfully prints A, B, C, D
Question 3: Choose the correct statements for the following C# code?
public System.Collections.IEnumerator GetEnumerator() { foreach (char ch in chrs) yield return ch; }
Definition of iterator for MyClass
Implements the GetEnumerator() method defined by IEnumerable
The yield return statement returns the next object in the collection, which in this case is the next character in chrs
All of the mentioned
Question 4: What does the yield return statement specify in the following C# code snippet?
public System.Collections.IEnumerator GetEnumerator() { foreach (char ch in chrs) yield return ch; }
A B C D E F G H I J K L M N O P Q R S T U V
Run time error
U T S R Q P O N M L K J I H G F E D C B A
Compile successfully prints nothing
Question 5: What will be the following C# code snippet specify?
class MyClass { char chrs = 'A' ; public IEnumerator GetEnumerator() { for (int i = 20; i >=0; --i) if (i == 10) yield break; yield return (char)((chrs + i)); } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (char ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } }
Code run successfully prints nothing
A B C D E F G H I J K L M N O P Q R S T U V
U T S R Q P O N M L
Compile time error
Question 6: What will be the output of the following C# code snippet?
class MyClass { int[] a = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}; public IEnumerator GetEnumerator() { for (int i = 0; i < 20; i++) { if (a[i] % 2 == 0) yield return (int)(a[i]); } } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach (int i in mc) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
prints nothing code run successfully
run time error
code runs successfully prints even number between 1 to 20
compile time error
Question 7: What will be the output of the following C# code snippet?
class MyClass { char ch = 'A'; public IEnumerable MyItr(int end) { for (int i = 0 ;i < end ;i++) yield return (char)(ch + i); } public IEnumerable MyItr(int begin, int end) { for (int i = begin ;i < end ;i++) yield return (char)(ch + i); } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); Console.WriteLine("Iterate the first 7 letters:"); foreach (char ch in mc.MyItr(7)) Console.Write(ch + " "); Console.WriteLine("n"); Console.WriteLine("Iterate letters from F to L:"); foreach (char ch in mc.MyItr(7, 12)) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } } Iterate the first 7 letters: A B C D E F G Iterate letters from F to L: G H I J K L Iterate the first 7 letters: A B C D E F G Iterate letters from F to L: H I J K L
Run time error
Compile time error
Question 8: What will be the output of the following C# code snippet?
class MyClass { char ch = 'A'; int e = 4; int k = 9; int z = 6; public IEnumerator GetEnumerator() { for (int i = 0; i < 26; i++) { if (i == e*k /z) yield break; yield return (int)(ch + i); } } } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); foreach(int ch in mc) Console.Write(ch + " "); Console.WriteLine(); Console.ReadLine(); } }
Compile time error
Run time error
65 66 67 68 69 70
Code run successfully prints nothing
Question 9: What are the advantages of the named iterator?
They allow to pass arguments to the iterator that control what elements are obtained
This form of iterators can be overloaded
Both They allow to pass arguments to the iterator that control what elements are obtained & This form of iterators can be overloaded
None of the mentioned
