gs gs108 Delegates, Generics and LINQ - Runtime Type - Quiz No.1
gs gs108 CSharp Quiz
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Question 1: Which mechanism among the following helps in identifying a type during the execution of a program?
Reflection
Runtime type ID
Both Reflection & Runtime type ID
None of the mentioned
Question 2: Select the statement which are correct about RTTI(Runtime type identification)?
It allows the type of an object to be determined during program execution
It tells what type of object is being referred to by a base class reference determined by RTTI
Helps in prevention of an invalid cast exception in advance
All of the mentioned
Question 3: Select the Keyword which supports the run time type identification?
is, as
as, typeof
Both is, as & as, typeof
Only is, as
Question 4: What does the following C# code signify?
expr is type
Determines the type of an object
a simple deceleration
Both Determines the type of an object & a simple deceleration
None of the mentioned
Question 5: What will be the output of the following C# code snippet?
class B { } class A : B { } class Program { static void Main(string[] args) { A a = new A(); B b = new B(); if (a is A) Console.WriteLine("a is an A"); if (b is A) Console.WriteLine("b is an A because it is derived from A"); if (a is B) Console.WriteLine("This won’t display -- a not derived from B"); Console.ReadLine(); } } a is an A This won’t display -- a not derived from Ba is an A b is an A because it is derived from Ab is an A because it is derived from A This won’t display -- a not derived from B"Both ""a is an A This won’t display — a not derived from B"" & ""a is an A b is an A because it is derived from A"""
Question 6: Which operator among the following supports the operation of conversion at runtime without generating the exceptions?
is
as
typeof
all of the mentioned
Question 7: Which operator among the following is used to perform the operation of boxing, unboxing, reference and identity conversions?
is
as
typeof
all of the mentioned
Question 8: What will be the output of the following C# code snippet?
class A {} class B : A {} class CheckCast { static void Main() { A a = new A(); B b = new B(); b = a as B; b = null; if(b==null) Console.WriteLine("The cast in b = (B) a is NOT allowed."); else Console.WriteLine("The cast in b = (B) a is allowed"); } }
Run time error
The cast in b = (B) a is NOT allowed
The cast in b = (B) a is allowed
Compile time error
Question 9: Which operator among the following supplies the information about the characteristics of a typeof?
is
as
typeof
none of the mentioned
Question 10: What will be the output of the following C# code snippet?
class UseTypeof { static void Main() { Type t = typeof(StreamReader); Console.WriteLine(t.FullName); if(t.IsClass) Console.WriteLine("Is a class."); if(t.IsAbstract) Console.WriteLine("Is abstract."); else Console.WriteLine("Is concrete."); } } Is a class Is abstract
Is abstract
System.IO.StreamReader Is a class Is concreteBoth Is a class Is abstract & System.IO.StreamReader Is a class Is concrete
