gs gs108 Miscellaneous Topics - Pointers Operation - Quiz No.2

gs gs108 CSharp Quiz

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Question 1: What will be the output of the following C# 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(); } }

Compile time error

Run time error

200

Question 2: What will be the output of the following C# 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(); } }

Compile time error

120

Run time error

Question 3: What will be the output of the following C# 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(); } } }

Run time error

Compile time error

p and p2 point to the same address

Only p2

Question 4: What will be the output of the following C# 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(); } }

Run time error

Result has no value

Compile time error

Question 5: What will be the output of the following C# 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(); } }

Run time error

110

Result has no value

Compile time error

Question 6: Choose the statement which defines the Nullable type Correctly:

A special version of a value type that is represented by a structure

A nullable type can also store the value null

Nullable types are objects of System.Nullable, where T must be a non nullable value type

All of the mentioned

Question 7: What does the following code depicts?

 i. System.Nullable<int> count; ii. bool? done;

Code i declares the objects of nullable of type Nullable<T> defined in the System namespace

Code ii declares a nullable type in much shorter and in more commonly used way using ‘?’

Both Code i declares the objects of nullable of type Nullable<T> defined in the System namespace & Code ii declares a nullable type in much shorter and in more commonly used way using ‘?’

None of the mentioned

Question 8: Which operator is commonly used to find the size of the type of C#?

size()

sizeof(type)

both size() & sizeof(type)

none of the mentioned

Question 9: What will be the output of the following C# 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(); } }

Run time error

Compile time error

Question 10: What will be the output of the following C# 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(); } }

3 2 1

1 2 3

None of the mentioned

Run time error