15295107
Descrição
Quiz por Prashant Singh R , atualizado more than 1 year ago
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Criado por Prashant Singh R
aproximadamente 6 anos atrás
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Questão 1
Questão
What must be different between two overloads of a method?
Responda
-
EITHER the number of parameters OR the return type of each method overload
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The names of the method overloads
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EITHER the number of parameters OR the type of at least one parameter
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EITHER the number of parameters OR the type of at least one parameter OR the return type of each method overload
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EITHER the names of the method overloads OR their return types
Questão 2
Questão
Which operator would you use to attach a handler to an event?
Responda
-
=
-
=+
-
+=
-
=>
-
->
Questão 3
Questão
Which of the following is a syntactically correct way to declare and initialize an array of "int"?
Responda
-
var x = new int[]{1, 2, 3};
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int[] x = int[] {1, 2, 3};
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int[3] x = new int{1, 2, 3};
-
var x = new {1, 2, 3};
Questão 4
Questão
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)
Responda
-
It won't, the yield return bypasses the finally block.
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Once, after the first item in the enumeration has been returned.
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Three times, once after returning each item in the enumeration.
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Once, after the enumeration is complete.
Questão 5
Questão
Name an advantage of passing a parameter to a method by reference, compared to passing by value
Responda
-
Passing by reference protects the data in the caller from inadvertant changes to the parameter value inside the called method.
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If the method throws an exception, passing by reference preserves more information in the stack trace.
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If the parameter is large, passing by reference saves data copying and can therefore be quicker.
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Passing by reference allows the method to safely execute on multiple threads simultaneously without risk of corrupting the data in the parameter.
Questão 6
Questão
In the following code, [System.Web.Services.WebMethod] is an example of which C# language feature?
Image:
Q6 (binary/octet-stream)
Responda
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Functional Property
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WebMethod
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Attribute
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Method-Setting
Questão 7
Responda
-
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.
Questão 8
Responda
-
var shortNames = names.Where(name => name.Length < 4) .OrderBy(name => name);
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var shortNames = names.Where(name.Length < 4) .OrderBy(x);
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var shortNames = names.Where(this.Length < 4) .OrderBy(this);
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var shortNames = names.Where(this.Length < 4) .OrderBy(this) .Select(this);
Questão 9
Questão
What is the full name of the "type" that is represented by keyword "long"?
Responda
-
System.Int64
-
System.Long64
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System.Int
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System.Int32
-
System.Long
Questão 10
Questão
What does the "params" keyword do when used in a method parameter list?
Responda
-
Guides the compiler in which overload of a method to choose
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Allows arguments of any type to be passed to a method
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Allows individual arguments to be omitted, with default values supplied, when calling the method
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Allows a variable number of arguments to be used when a method is called
Questão 11
Questão
What happens when the below code is executed?
public interface ICar
{ public int getspeed(); }
Responda
-
Succeed
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Compile error
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Warning
Questão 12
Questão
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();
}
Responda
-
Standard transportation Standard transportation Standard transportation
-
Standard transportation A roof that opens up. Carries seven people.
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Standard transportation Standard transportation Carries seven people.
Questão 13
Questão
On the whole, which types can you inherit from ?
Responda
-
Any struct or class that is not marked as sealed
-
Any class that is not marked as sealed
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Any class
-
Any type except for the C# built-in types (int, bool, string, etc.)
Questão 14
Questão
Which of these shows the correct way to declare an extension method on "string" called "WordCount()" ?
Responda
-
public static int WordCount (string str) : this str { /* ... */ }
-
public static extension int WordCount (string, string str) { /* ... */ }
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public extension int string.WordCount(this string str) { /* ... */ }
-
public static int WordCount (this string str) { /* ... */ }
Questão 15
Questão
What is the visibility of the "CurrentSpeed" property in the following code ?
public class Automobile
{ double CurrentSpeed {get; set;} }
Responda
-
Protected internal
-
Protected
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Internal
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Public
-
Private
Questão 16
Questão
Consider the following code.
Which of the following is true about the inner "userResponse" declaration?
Image:
Q16 (binary/octet-stream)
Responda
-
It will cause a compiler error because the name conflicts with the first userResponse declaration
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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.
Questão 17
Responda
-
A generic collection
-
A generic method
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A generic constraint
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A generic type
Questão 18
Questão
How can you "modify" the "Manager" constructor declaration so that it passes its parameter to the "Employee" constructor
Image:
Q18 (binary/octet-stream)
Responda
-
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) /* ... */ }
Questão 19
Responda
-
"Hello World!" is displayed in the text block on button click
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"Hello World!" is displayed in the text block on button click, after 1 second.
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"Hello World!" is never displayed in the text block
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"Hello World!" is displayed in the text block on button click, after 10 seconds
Questão 20
Questão
What will be the execution result of this code (in the console) ?
Image:
Q20 (binary/octet-stream)
Responda
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Prints values from 1 to 10
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Prints "10" - ten times
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Throws a compiler error - as del() is not a method
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Prints "1" - ten times
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Throws a compiler error - as C# "List" cannot have methods in it
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