Copy and Edit

C# - Test Drive...!!

Description

A small test drive - to evaluate a few important concepts from C#
Prashant Singh R
Quiz by Prashant Singh R , updated more than 1 year ago
Prashant Singh R
Created by Prashant Singh R over 5 years ago
197
0
0

Resource summary

Question 1

Question
What must be different between two overloads of a method?
Answer
  • EITHER the number of parameters OR the return type of each method overload
  • The names of the method overloads
  • EITHER the number of parameters OR the type of at least one parameter
  • EITHER the number of parameters OR the type of at least one parameter OR the return type of each method overload
  • EITHER the names of the method overloads OR their return types

Question 2

Question
Which operator would you use to attach a handler to an event?
Answer
  • =
  • =+
  • +=
  • =>
  • ->

Question 3

Question
Which of the following is a syntactically correct way to declare and initialize an array of "int"?
Answer
  • var x = new int[]{1, 2, 3};
  • int[] x = int[] {1, 2, 3};
  • int[3] x = new int{1, 2, 3};
  • var x = new {1, 2, 3};

Question 4

Question
Consider this implementation of an enumerator. If this is enumerated, at what point will the message "In finally block!" be written to the console?
Image:
Q4 (binary/octet-stream)
Answer
  • It won't, the yield return bypasses the finally block.
  • Once, after the first item in the enumeration has been returned.
  • Three times, once after returning each item in the enumeration.
  • Once, after the enumeration is complete.

Question 5

Question
Name an advantage of passing a parameter to a method by reference, compared to passing by value
Answer
  • Passing by reference protects the data in the caller from inadvertant changes to the parameter value inside the called method.
  • If the method throws an exception, passing by reference preserves more information in the stack trace.
  • If the parameter is large, passing by reference saves data copying and can therefore be quicker.
  • Passing by reference allows the method to safely execute on multiple threads simultaneously without risk of corrupting the data in the parameter.

Question 6

Question
In the following code, [System.Web.Services.WebMethod] is an example of which C# language feature?
Image:
Q6 (binary/octet-stream)
Answer
  • Functional Property
  • WebMethod
  • Attribute
  • Method-Setting

Question 7

Question
What is the main problem with the following code?
Image:
Q7 (binary/octet-stream)
Answer
  • The variable "ex" has been declared twice in the same context.
  • The variable "ex" is not used in the last catch block.
  • Only one "catch" block can be associated with each "try" block.
  • The last "catch" block is unreachable.

Question 8

Question
Write the following LINQ query using method syntax.
Image:
Q8 (binary/octet-stream)
Answer
  • var shortNames = names.Where(name => name.Length < 4) .OrderBy(name => name);
  • var shortNames = names.Where(name.Length < 4) .OrderBy(x);
  • var shortNames = names.Where(this.Length < 4) .OrderBy(this);
  • var shortNames = names.Where(this.Length < 4) .OrderBy(this) .Select(this);

Question 9

Question
What is the full name of the "type" that is represented by keyword "long"?
Answer
  • System.Int64
  • System.Long64
  • System.Int
  • System.Int32
  • System.Long

Question 10

Question
What does the "params" keyword do when used in a method parameter list?
Answer
  • Guides the compiler in which overload of a method to choose
  • Allows arguments of any type to be passed to a method
  • Allows individual arguments to be omitted, with default values supplied, when calling the method
  • Allows a variable number of arguments to be used when a method is called

Question 11

Question
What happens when the below code is executed? public interface ICar { public int getspeed(); }
Answer
  • Succeed
  • Compile error
  • Warning

Question 12

Question
class Car { public void DescribeCar() { ShowDetails(); } public virtual void ShowDetails() { System.Console.WriteLine("Standard transportation."); } } class ConvertibleCar : Car { public new void ShowDetails() { System.Console.WriteLine("A roof that opens up."); } } class Minivan : Car { public override void ShowDetails() { System.Console.WriteLine("Carries seven people."); } } public static void TestCars1() { Car car1 = new Car(); car1.DescribeCar(); ConvertibleCar car2 = new ConvertibleCar(); car2.DescribeCar(); Minivan car3 = new Minivan(); car3.DescribeCar(); }
Answer
  • Standard transportation Standard transportation Standard transportation
  • Standard transportation A roof that opens up. Carries seven people.
  • Standard transportation Standard transportation Carries seven people.

Question 13

Question
On the whole, which types can you inherit from ?
Answer
  • Any struct or class that is not marked as sealed
  • Any class that is not marked as sealed
  • Any class
  • Any type except for the C# built-in types (int, bool, string, etc.)

Question 14

Question
Which of these shows the correct way to declare an extension method on "string" called "WordCount()" ?
Answer
  • public static int WordCount (string str) : this str { /* ... */ }
  • public static extension int WordCount (string, string str) { /* ... */ }
  • public extension int string.WordCount(this string str) { /* ... */ }
  • public static int WordCount (this string str) { /* ... */ }

Question 15

Question
What is the visibility of the "CurrentSpeed" property in the following code ? public class Automobile { double CurrentSpeed {get; set;} }
Answer
  • Protected internal
  • Protected
  • Internal
  • Public
  • Private

Question 16

Question
Consider the following code. Which of the following is true about the inner "userResponse" declaration?
Image:
Q16 (binary/octet-stream)
Answer
  • It will cause a compiler error because the name conflicts with the first userResponse declaration
  • It will not allocate a new variable, but will instead overwrite the contents of the outer userResponse variable.
  • It will cause a compiler error because you cannot declare local variables inside a foreach loop.
  • It will cause the outer userResponse variable to be hidden within the foreach loop.

Question 17

Question
What does this code illustrate?
Image:
Q17 (binary/octet-stream)
Answer
  • A generic collection
  • A generic method
  • A generic constraint
  • A generic type

Question 18

Question
How can you "modify" the "Manager" constructor declaration so that it passes its parameter to the "Employee" constructor
Image:
Q18 (binary/octet-stream)
Answer
  • public Manager(string name) : base(name) { base.ctor(name) /* ... */ }
  • public Manager(string name) : Employee(name) { /* ... */}
  • public Manager(string name) : base(name) { /* ... */}
  • public Manager(string name) { Employee(name) /* ... */ }

Question 19

Question
What will be the execution result of the following code ?
Image:
Q19 (binary/octet-stream)
Answer
  • "Hello World!" is displayed in the text block on button click
  • "Hello World!" is displayed in the text block on button click, after 1 second.
  • "Hello World!" is never displayed in the text block
  • "Hello World!" is displayed in the text block on button click, after 10 seconds

Question 20

Question
What will be the execution result of this code (in the console) ?
Image:
Q20 (binary/octet-stream)
Answer
  • Prints values from 1 to 10
  • Prints "10" - ten times
  • Throws a compiler error - as del() is not a method
  • Prints "1" - ten times
  • Throws a compiler error - as C# "List" cannot have methods in it
Show full summary Hide full summary

Want to create your own Quizzes for free with GoConqr? Learn more.

Similar

Evaluation of Explanations of Schizophrenia
Charlotte97
Orbital Mechanics
Luke Hansford
Software Processes
Nurul Aiman Abdu
Module 1: Introduction to Engineering Materials
Kyan Clay
Mathematics
rhiannonsian
Power
Luke Hansford
AOCS - Attitude and orbit control systems
Luke Hansford
Ordinary Differential Equations
rhiannonsian
audio electronics
Lillian Mehler
Building Structures
Niat Habtemariam
communication system
Lillian Mehler
Browse Library