C# 2 Fundamentals

8/4/2019 C# 2 Fundamentals

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C# 2 fundamental

C# 2.0 Fundmentals

Progress:

Code Sampleusing System;

namespace App{static delegate int Add(ref int a, ref int b);

class Program{static void Main(string[] args){

Add d = delegate(ref int a, ref int b) {Console.WriteLine(a + b);a++;b++;return a + b;};

int x = 1;int y = 1;Console.WriteLine(d(ref x, ref y));}}}

Which one of the following correctly describes the error in the above code sample?Choice 1

Delegates may not be static.


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Choice 2

Delegates may not have a return type.Choice 3

a and b are uninitialized since they are declared with the ref keyword.Choice 4

The ref keyword may not be used with anonymous methods.Choice 5

x and y may not be set before calling the delegate.

C# 2.0 Fundmentals, Question 1 of 40

Number Sample

Which one of the following is the output of the application in the number sample above?Choice 1

1248Choice 2

1

Choice 3

0357


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Choice 4

24Choice 5

24816

Int(2/4)Which one of the following C# class modifiers specifies that the class CANNOT be inherited?Choice 1

noninheritableChoice 2

sealedChoice 3

internalChoice 4

abstractChoice 5

final

Which one of the following keywords causes a compile time error if used in a static method?Choice 1

usingChoice 2


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thisChoice 3

lockChoice 4

fixedChoice 5

continueclass Program{public static readonly int instanceCount;

static void Start( ) {instanceCount = 1;}

}


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C# 2.0 Fundmentals

Progress:

Delegate Sample

Which one of the following is the output of the code in the delegate sample above when new A( ).Run( ) is executed?Choice 1

10

int? x = 5;Console.WriteLine(x.GetType( ));


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1: Int32.Parse("two");

2: Int32.TryParse("two", out i);

Which one of the following is true regarding the two lines in the above Int32 sample?Choice 1

The top line returns only an integer; in the bottom line, "i" can be of any numeric data type.Choice 2

The top line returns an integer by value; the bottom line sends back an integer by reference.Choice 3

The top line does not compile because the compiler will see invalid data; the bottom line compiles as is.Choice 4

The top line does not compile outside of a try/catch block; the bottom can be placed anywhere.Choice 5

The top line throws an exception when Parse fails; the bottom line returns false.

C# 2.0 Fundmentals, Question 16 of 40

The answer to the question below is (5). I have three questions:

1) I don't understand how the boolean gets printed. I can see how the strings are output to the consolebut I don't see how the booleans get there

2) Is the first operator ' | ' considered to be a true/false condition statement?


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3) Is the second operator ' || ' considered to be an 'Or' condition statement?

Thanks!

public static void Main(string[] args)

{System.Console.WriteLine(GetX() | GetY());System.Console.WriteLine(GetX() || GetY());

}public static bool GetX(){

System.Console.WriteLine("GetX");return true;

}

public static bool GetY(){

System.Console.WriteLine("GetY");return false;

}

Given the sample code above, what is the console output?Choice 1.GetXGetYFalseGetXFalse

Choice 2.GetXGetYFalseGetX


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GetYFalse

Choice 3.GetX

GetYTrueGetXGetYTrue

Choice 4.GetXGetYTrueGetXGetYFalse

Choice 5.GetXGetYTrueGetXTrue

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C# 2 Fundamentals