C# Interview Questions - 19

1. What will be the output of the code snippet? unsafe static void Main() { int a = 5; int b = 5; int c = 5; int[] ptr = new int [3]; ptr[0] = &a; ptr[1] = &b; ptr[2] = &c; for (a = 0; a < 3; a++) { c += *ptr[a]; Console.WriteLine(c); } Console.ReadLine(); }

A. base

B. this

C. super

D. extract

Correct Answer is : this

2. What will be the output of the code snippet? class UnsafeCode{ unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for (int i = 2; i >= 0; --i) { ptrs[i] = ptrs[i]* 3; ptrs[i] = ptrs[i] + 4; Console.WriteLine(ptrs[i]); } Console.ReadLine(); }}

A. get

B. set

C. access

D. all of the mentioned

Correct Answer is : access

3. Among the given pointers which of following cannot be incremented?

A. A property can be a static member whereas an indexer is always an instance member

B. A get accessor of a property corresponds to a method with no parameters whereas get accessor of an indexer corresponds to a method with the same formal parameters lists as the indexer

C. It is an error for indexer to declare a local variable with the same name as indexer parameters

D. All of the mentioned

Correct Answer is : All of the mentioned

4. A structure pointer points to __________

A. class student

B. class student

C. class student

D. None of the mentioned

Correct Answer is : class student

5. What will be the declaration of the variable ptr as the pointer to array of 6 floats?

A. To use collection of items at a large scale we make use of indexers as they utilize objects of class that represent the collection as an array

B. Indexers are also convenient as they can also make use of different types of indexers like int, string etc

C. An indexer allows an object to be indexed such as an array

D. All of the mentioned

Correct Answer is : All of the mentioned

6. what will be the output of code snippet? class UnsafeCode { unsafe static void Main() { char[] arr = { 'A', 'B', 'C', 'D', 'E' }; fixed (char* P = arr) { int i; for (i = 0 ;i < 5 ;i++) if (P % 2 == 0) ++P; else (*P)++; Console.WriteLine(arr); } Console.ReadLine(); } }

A. No need to use the name of the property while using an indexed property

B. An indexer property should accept at least one argument

C. Indexers can be overloaded

D. All of the mentioned

Correct Answer is : All of the mentioned

7. What will be the output of given code snippet? class UnsafeCode { unsafe static void Main() { int[] nums = new int[10]; Console.WriteLine("Index pointer like array."); fixed (int* p = nums) { for (int i = 0 ;i <10 ;i++) p[i] = i; for (int i = 10 ;i >0 ;i--) Console.WriteLine("p[{0}]: {1} ", i, p[i]); Console.ReadLine(); } } }

A. group[3] = 34;

B. group g = group();

C. Console.WriteLine(group[3]);

D. group g = new group();

Correct Answer is : group g = new group();

8. What will be the output of the given code snippet? class UnsafeCode { unsafe static void Main() { string str = "this is a test"; fixed (char* p = str) { for (int i = str.Length-1 ;p[i] != 0 ;i--) Console.Write(p[i]); } Console.ReadLine(); } }

A. A class

B. An interface

C. A function

D. A property

Correct Answer is : A class

9. What will be the output of given code snippet? class UnsafeCode { unsafe static void Main() { int* p ; int ch = 135; p = &(ch); Console.WriteLine(Convert.ToChar(p)); if (*p == 'A') Console.WriteLine(Convert.ToBoolean(1)); else Console.WriteLine(Convert.ToBoolean(0)); Console.ReadLine(); } }

A. Compile time error

B. Run time error

C. 123, abc, xyz

D. 0

Correct Answer is : Run time error

10. What will be the output of given code snippet? class UnsafeCode{ struct MyStruct { public int a; public int b; public int Sum() { return a * b; } } unsafe static void Main() { MyStruct o = new MyStruct(); MyStruct* p; p = &o; p->a = 10; p->b = 20; Console.WriteLine("Value is " + p->Sum()); Console.ReadLine(); }}

A. op

B. opoverload

C. operator

D. operatoroverload

Correct Answer is : operator

11. What will be the output of given code snippet? class UnsafeCode{ struct MyStruct { public int a; public int b; public int Sum() { return a / b; } } unsafe static void Main() { MyStruct o = new MyStruct(); MyStruct* p; p = &o; p->a = 60; p->b = 15; int c = 30; Console.WriteLine("Value is : " + p->Sum()*c); Console.ReadLine(); }}

A. The conditional logical operators cannot be overloaded

B. The array indexing operator can be overloaded

C. A public or nested public preference type does not overload the equality operator

D. None of the mentioned

Correct Answer is : The conditional logical operators cannot be overloaded

12. What will be the output of given code snippet? class UnsafeCode{ unsafe static void Main() { int[] nums = new int[10]; fixed (int* p = &nums[0], p2 = nums) { if (p == p2) Console.WriteLine("p and p2 point to same address."); Console.ReadLine(); } }}

A. ‘%’ < ‘<<‘ < ‘+’ < ‘-‘ < ‘&’ < ‘/’

B. ‘<<‘ < ‘&’ < ‘%’ < ‘-‘ < ‘/’ < ‘+’

C. ‘&’ < ‘-‘ <‘%’ < ‘<<‘ < ‘/’ < ‘+’

D. ‘/’ < ‘-‘ < ‘%’ < ‘+’ < ‘<<‘ < ‘&’

Correct Answer is : ‘<<‘ < ‘&’ < ‘%’ < ‘-‘ < ‘/’ < ‘+’

13. What will be the output of given code snippet? class UnsafeCode{ static void Main() { int? count = null; int? result = null; int incr = 10; result = count + incr; if (result.HasValue) Console.WriteLine("result has this value: " + result.Value); else Console.WriteLine("result has no value"); Console.ReadLine(); }}

A. ||

B. ‘+=’

C. #ERROR!

D. [].

Correct Answer is : #ERROR!

14. What will be the output of given code snippet? class UnsafeCode{ static void Main() { int count = 100; int? result = null; int incr = 10; result = count + incr; if (result.HasValue) Console.WriteLine("result has this value: " + result.Value); else Console.WriteLine("result has no value"); Console.ReadLine(); }}

A. Mathematical or physical modeling where we use classes to represent objects such as vectors,matrices,complex-numbers etc

B. Graphical programs where coordinate related objects are used to represent positions on the screen

C. Financial programs where a class represents an amount of money

D. All of the mentioned

Correct Answer is : All of the mentioned

15. What does the following code depicts? 1. System.Nullable count; 2. bool? done;

A. public sample operator +(int a, int b)

B. public abstract operator +(int a, int b)

C. public static sample operator +(int a, int b)

D. public abstract sample operator +(int a, int b)

Correct Answer is : public static sample operator +(int a, int b)

16. Which operator is commonly used to find the size of the type of C#?

A. Each property consists of accessor as get and set

B. A property cannot be either read or write only

C. Properties can be used to store and retrieve values to and from the data members of a class

D. Properties are like actual methods which work like data members

Correct Answer is : Each property consists of accessor as get and set

17. What will be the output of given code snippet? unsafe struct FixedBankRecord { public fixed byte Name[80]; public double Balance; public long ID; } class UnsafeCode { unsafe static void Main() { Console.WriteLine("Size of FixedBankRecord is " + sizeof(FixedBankRecord)); Console.ReadLine(); } }

A. Properties have their own access levels like private, public, protected etc. which allows it to have better control about managing read and write properties

B. Properties give us control about what values may be assigned to a member variables of a class they represent

C. Properties consist of set accessor inside which we can validate the value before assigning it to the data variable

D. All of the mentioned

Correct Answer is : All of the mentioned

18. What will be the output of given code snippet? class UnsafeCode{ unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for (int i = 2; i >=0; i--) Console.WriteLine(ptrs[i]); Console.ReadLine(); }}

A. Class

B. Struct

C. Interface

D. All of the mentioned

Correct Answer is : All of the mentioned

19. The capability of an object in Csharp to take number of different forms and hence display behaviour as according is known as:

A. Private

B. Public

C. Protected Internal

D. All of the mentioned

Correct Answer is : All of the mentioned

20. Select the output for the given set of code? public class sample { public static int x = 100; public static int y = 150; } public class newspaper :sample { new public static int x = 1000; static void Main(string[] args) { console.writeline(sample.x + " " + sample.y + " " + x); } }

A. Properties which can only be set

B. Properties once set and hence values cannot be read back in nature

C. Useful for usage in classes which store sensitive information like password of a user

D. All of the mentioned

Correct Answer is : All of the mentioned

C SHARP interview questions part 19

C SHARP interview questions part 19

Take as many assements as you can to improve your validate your skill rating

Total Questions: 20

1. What will be the output of the code snippet? unsafe static void Main() { int a = 5; int b = 5; int c = 5; int[] ptr = new int [3]; ptr[0] = &a; ptr[1] = &b; ptr[2] = &c; for (a = 0; a < 3; a++) { c += *ptr[a]; Console.WriteLine(c); } Console.ReadLine(); }

2. What will be the output of the code snippet? class UnsafeCode{ unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for (int i = 2; i >= 0; --i) { ptrs[i] = ptrs[i]* 3; ptrs[i] = ptrs[i] + 4; Console.WriteLine(ptrs[i]); } Console.ReadLine(); }}

3. Among the given pointers which of following cannot be incremented?

4. A structure pointer points to __________

5. What will be the declaration of the variable ptr as the pointer to array of 6 floats?

6. what will be the output of code snippet? class UnsafeCode { unsafe static void Main() { char[] arr = { 'A', 'B', 'C', 'D', 'E' }; fixed (char* P = arr) { int i; for (i = 0 ;i < 5 ;i++) if (P % 2 == 0) ++P; else (*P)++; Console.WriteLine(arr); } Console.ReadLine(); } }

8. What will be the output of the given code snippet? class UnsafeCode { unsafe static void Main() { string str = "this is a test"; fixed (char* p = str) { for (int i = str.Length-1 ;p[i] != 0 ;i--) Console.Write(p[i]); } Console.ReadLine(); } }

9. What will be the output of given code snippet? class UnsafeCode { unsafe static void Main() { int* p ; int ch = 135; p = &(ch); Console.WriteLine(Convert.ToChar(p)); if (*p == 'A') Console.WriteLine(Convert.ToBoolean(1)); else Console.WriteLine(Convert.ToBoolean(0)); Console.ReadLine(); } }

12. What will be the output of given code snippet? class UnsafeCode{ unsafe static void Main() { int[] nums = new int[10]; fixed (int* p = &nums[0], p2 = nums) { if (p == p2) Console.WriteLine("p and p2 point to same address."); Console.ReadLine(); } }}

15. What does the following code depicts? 1. System.Nullable count; 2. bool? done;

16. Which operator is commonly used to find the size of the type of C#?

17. What will be the output of given code snippet? unsafe struct FixedBankRecord { public fixed byte Name[80]; public double Balance; public long ID; } class UnsafeCode { unsafe static void Main() { Console.WriteLine("Size of FixedBankRecord is " + sizeof(FixedBankRecord)); Console.ReadLine(); } }

18. What will be the output of given code snippet? class UnsafeCode{ unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for (int i = 2; i >=0; i--) Console.WriteLine(ptrs[i]); Console.ReadLine(); }}

19. The capability of an object in Csharp to take number of different forms and hence display behaviour as according is known as:

20. Select the output for the given set of code? public class sample { public static int x = 100; public static int y = 150; } public class newspaper :sample { new public static int x = 1000; static void Main(string[] args) { console.writeline(sample.x + " " + sample.y + " " + x); } }

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C SHARP interview questions part 19

C SHARP interview questions part 19

Take as many assements as you can to improve your validate your skill rating

Total Questions: 20

1. What will be the output of the code snippet? unsafe static void Main() { int a = 5; int b = 5; int c = 5; int*[] ptr = new int* [3]; ptr[0] = &a; ptr[1] = &b; ptr[2] = &c; for (a = 0; a < 3; a++) { c += *ptr[a]; Console.WriteLine(c); } Console.ReadLine(); }

2. What will be the output of the code snippet? class UnsafeCode{ unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for (int i = 2; i >= 0; --i) { ptrs[i] = ptrs[i]* 3; ptrs[i] = ptrs[i] + 4; Console.WriteLine(ptrs[i]); } Console.ReadLine(); }}

3. Among the given pointers which of following cannot be incremented?

4. A structure pointer points to __________

5. What will be the declaration of the variable ptr as the pointer to array of 6 floats?

6. what will be the output of code snippet? class UnsafeCode { unsafe static void Main() { char[] arr = { 'A', 'B', 'C', 'D', 'E' }; fixed (char* P = arr) { int i; for (i = 0 ;i < 5 ;i++) if (*P % 2 == 0) ++*P; else (*P)++; Console.WriteLine(arr); } Console.ReadLine(); } }

8. What will be the output of the given code snippet? class UnsafeCode { unsafe static void Main() { string str = "this is a test"; fixed (char* p = str) { for (int i = str.Length-1 ;p[i] != 0 ;i--) Console.Write(p[i]); } Console.ReadLine(); } }

9. What will be the output of given code snippet? class UnsafeCode { unsafe static void Main() { int* p ; int ch = 13*5; p = &(ch); Console.WriteLine(Convert.ToChar(*p)); if (*p == 'A') Console.WriteLine(Convert.ToBoolean(1)); else Console.WriteLine(Convert.ToBoolean(0)); Console.ReadLine(); } }

12. What will be the output of given code snippet? class UnsafeCode{ unsafe static void Main() { int[] nums = new int[10]; fixed (int* p = &nums[0], p2 = nums) { if (p == p2) Console.WriteLine("p and p2 point to same address."); Console.ReadLine(); } }}

15. What does the following code depicts? 1. System.Nullable count; 2. bool? done;

16. Which operator is commonly used to find the size of the type of C#?

17. What will be the output of given code snippet? unsafe struct FixedBankRecord { public fixed byte Name[80]; public double Balance; public long ID; } class UnsafeCode { unsafe static void Main() { Console.WriteLine("Size of FixedBankRecord is " + sizeof(FixedBankRecord)); Console.ReadLine(); } }

18. What will be the output of given code snippet? class UnsafeCode{ unsafe static void Main() { int* ptrs = stackalloc int[3]; ptrs[0] = 1; ptrs[1] = 2; ptrs[2] = 3; for (int i = 2; i >=0; i--) Console.WriteLine(ptrs[i]); Console.ReadLine(); }}

19. The capability of an object in Csharp to take number of different forms and hence display behaviour as according is known as:

20. Select the output for the given set of code? public class sample { public static int x = 100; public static int y = 150; } public class newspaper :sample { new public static int x = 1000; static void Main(string[] args) { console.writeline(sample.x + " " + sample.y + " " + x); } }

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1. What will be the output of the code snippet? unsafe static void Main() { int a = 5; int b = 5; int c = 5; int[] ptr = new int [3]; ptr[0] = &a; ptr[1] = &b; ptr[2] = &c; for (a = 0; a < 3; a++) { c += *ptr[a]; Console.WriteLine(c); } Console.ReadLine(); }

6. what will be the output of code snippet? class UnsafeCode { unsafe static void Main() { char[] arr = { 'A', 'B', 'C', 'D', 'E' }; fixed (char* P = arr) { int i; for (i = 0 ;i < 5 ;i++) if (P % 2 == 0) ++P; else (*P)++; Console.WriteLine(arr); } Console.ReadLine(); } }

9. What will be the output of given code snippet? class UnsafeCode { unsafe static void Main() { int* p ; int ch = 135; p = &(ch); Console.WriteLine(Convert.ToChar(p)); if (*p == 'A') Console.WriteLine(Convert.ToBoolean(1)); else Console.WriteLine(Convert.ToBoolean(0)); Console.ReadLine(); } }