- C# Test 8

Which of the following are valid .NET CLR JIT performance counters?
1. Total memory used for JIT compilation
2. Average memory used for JIT compilation
3. Number of methods that failed to compile with the standard JIT
4. Percentage of processor time spent performing JIT compilation
5. Percentage of memory currently dedicated for JIT compilation

1, 2

3, 4

4, 5

1, 5

Which of the following jobs are done by Common Language Runtime?
1. It provides core services such as memory management, thread management, and remoting.
2. It enforces strict type safety.
3. It provides Code Access Security.
4. It provides Garbage Collection Services.

Only 2, 3 and 4

Only 1 and 2

Only 3, 4

Only 1, 3 and 4

All of the above

What will be the output of the C#.NET code snippet given below?

char ch = Convert.ToChar ('a' | 'b' | 'c'); 
 switch (ch)
 {
 case 'A': 
 case 'a':
 Console.WriteLine ("case A | case a");
 break;
 
 case 'B': 
 case 'b':
 Console.WriteLine ("case B | case b");
 break;
 
 case 'C':
 case 'c':
 case 'D':
 case 'd':
 Console.WriteLine ("case D | case d");
 break;
 }

Compile Error

case D | case d

case A | case a

case B | case b

No output

Suppose n is a variable of the type Byte and we wish, to check whether its fourth bit (from right) is ON or OFF. Which of the following statements will do this correctly?

if ((n ~ 8) == 8)
 Console. WriteLine("Fourth bit is ON");

 if ((n ^ 8) == 8)
 Console.WriteLine("Fourth bit is ON");

if ((n&8) == 8)
 Console.WriteLine("Fourth bit is ON");

if ((n&16) == 16)
 Console.WriteLine("Fourth bit is ON");

if ((n ! 8) == 8)
 Console.WriteLine("Fourth bit is ON");

What will be the output of the C#.NET code snippet given below?

int num = 1, z = 5;
 
 if (!(num <= 0))
 Console.WriteLine( ++num + z++ + " " + ++z ); 
 else
 Console.WriteLine( --num + z-- + " " + --z );

7 7

6 5

5 6

6 6

What will be the output of the C#.NET code snippet given below?

namespace IndiabixConsoleApplication
 {
 class SampleProgram
 {
 static void Main(string[ ] args)
 {
 int i = 10;
 double d = 34.340;
 fun(i);
 fun(d);
 }
 static void fun(double d)
 {
 Console.WriteLine(d + " ");
 }
 }
 }

10 34.34

10 34.340

10.000000 34.340000

10 34

What will be the output of the C#.NET code snippet given below?

namespace IndiabixConsoleApplication
 {
 class SampleProgram
 {
 static void Main(string[ ] args)
 {
 object[] o = new object[] {"1", 4.0, "India", 'B'};
 fun (o);
 }
 static void fun (params object[] obj)
 {
 for (int i = 0; i < obj.Length-1; i++)
 Console.Write(obj[i] + " ");
 }
 }
 }

1 4.0 India

1 4 India

1 4.0 India B

1 India B

What will be the output of the C#.NET code snippet given below?

namespace IndiabixConsoleApplication
 { 
 class Sample
 { 
 static Sample()
 { 
 Console.Write("Sample class ");
 }
 public static void Bix1()
 { 
 Console.Write("Bix1 method ");
 } 
 } 
 class MyProgram
 { 
 static void Main(string[ ] args)
 { 
 Sample.Bix1();
 } 
 } 
 }

Bix1 method Sample class

Bix1 method

Sample class

Sample class Bix1 method

Sample class Sample class

Which one of the following statements is correct?

The default value of numeric array elements is zero.

The length of an Array is the number of dimensions in the Array.

Array elements can be of integer type only.

The rank of an Array is the total number of elements it can contain.

The Array elements are guaranteed to be sorted.

Which of the following are the correct ways to define an array of 2 rows and 3 columns?
1.

 int[ , ] a;
 a = new int[1, 2]{{7, 1, 3}, {2, 9, 6}};

2.

 int[ , ] a = {{7, 1, 3}, {2, 9,6 }};

3.

 int[ , ] a;
 a = new int[2, 3]{};

4.

 int[ , ] a;
 a = new int[2, 3]{{7, 1, 3},{2, 9, 6}};

5.

 int[ , ] a;
 a = new int[1, 2];

2, 4, 5

2, 3

1, 3

1, 2 , 3

4, 5

Which one of the following classes are present System.Collections.Generic namespace?
1. Stack
2. Tree
3. SortedDictionary
4. SortedArray

1 and 2 only

1 and 3 only

2 and 4 only

None of the above

All of the above

For the code snippet shown below, which of the following statements are valid?

public class Generic
 {
 public T Field; 
 public void TestSub()
 {
 T i = Field + 1;
 }
 }
 class MyProgram
 {
 static void Main(string[] args)
 {
 Generic gen = new Generic();
 gen.TestSub();
 }
 }

Program will generate run-time exception.

Compiler will report an error: Operator '+' is not defined for types T and int.

Result of addition is system-dependent.

Addition will produce result 1.

None of the above.

For the code snippet shown below, which of the following statements are valid?

public class TestIndiaBix
 {
 public void TestSub (M arg)
 {
 Console.Write(arg);
 }
 }
 class MyProgram
 {
 static void Main(string[] args)
 {
 TestIndiaBix bix = new TestIndiaBix();
 bix.TestSub("IndiaBIX ");
 bix.TestSub(4.2f);
 }
 }

Program will generate a run-time exception.

Compiler will generate an error.

A non generic class Hello cannot have generic subroutine.

Program will compile and on execution will print: IndiaBIX 4.2

None of the above.

Which of the following CANNOT be used as an underlying datatype for an enum in C#.NET?

int

short

byte

float

Which of the following statements is correct about an enum used in C#.NET?

enum is a reference type.

Whether it a value type or a reference type depends upon size.

Whether it a value type or a reference type depends upon a Project Setting made in Visual Stiiclio.NET.

enum is a value type.

We can programmatically control whether it is a value type or a reference type.

Which of the following statements are correct?
1. The signature of an indexer consists of the number and types of its formal parameters.
2. Indexers are similar to properties except that their accessors take parameters.
3. Accessors of interface indexers use modifiers.
4. The type of an indexer and the type of its parameters must be at least as accessible as the indexer itself.
5. An interface accessor contains a body.

1, 2, 4

1, 3, 5

3, 5

2, 4

Which of the following statements is correct about the C#.NET program given below if a value "6" is input to it?

using System;
 namespace IndiabixConsoleApplication
 {
 class MyProgram
 {
 static void Main (string[] args)
 {
 int index; 
 int val = 66; 
 int[] a = new int[5]; 
 try
 {
 Consote.Write("Enter a number: "); 
 index = Convert.ToInt32(Console.ReadLine()); 
 a[index] = val;
 }
 catch(Exception e)
 {
 Console.Write("Exception occurred ");
 }
 Console.Write("Remaining program ");
 }
 }
 }

It will output: Exception occurred

It will output: Remaining program

It will output: Remaining program Exception occurred

It will output: Exception occurred Remaining program

The value 66 will get assigned to a[6].

Which of the following statements are correct?
1. All operators in C#.NET can be overloaded.
2. We can use the new modifier to modify a nested type if the nested type is hiding another type.
3. In case of operator overloading all parameters must be of the different type than the class or struct that declares the operator.
4. Method overloading is used to create several methods with the same name that performs similar tasks on similar data types.
5. Operator overloading permits the use of symbols to represent computations for a type.

3, 4

1, 3

2, 5

2, 4