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Define Unsafe Keyword

Posted By :Narayanan     Posted Date :January 16, 2013    Points :40   Category :C# 
In C# the value can be directly referenced to a variable, so there is no need of pointer. Use of pointer sometime crashes the application. But C# supports pointer, that means we can use pointer in C#.The use of pointer in C# is defined as a unsafe code. So if we want to use pointer in C# the pointer must be present in the body of unsafe declaration. But pointer does not come under garbage collection.


You can also find related Interview Question to Define Unsafe Keyword  below: 

What is the use of unsafe keyword in C#?

  
In C# the value can be directly referenced to a variable, so there is no need of pointer. Use of pointer sometime crashes the application. But C# supports pointer, that means we can use pointer in C#.

The use of pointer in C# is defined as a unsafe code. So if we want to use pointer in C# the pointer must be present in the body of unsafe declaration. But pointer does not come under garbage collection.

Example:-

unsafe
{
int a, *b;
a = 25;
b = &a;
Console.WriteLine("b= {0}",b);//returns b= 25
} (More...)

To define abstract class in VB which keyword is used?

  
MustInherit keyword is used to create an abstract class in VB. (More...)

To define abstract method which keyword is used in VB?

  
MustOverride keyword is used to define an abstract method in VB. (More...)

Define namespace in C++ ?

  
It is a feature in c++ to minimize name collisions in the global name space. This namespace keyword assigns a distinct name to a library that allows other libraries to use the same identifier names without creating any name collisions. Furthermore, the compiler uses the namespace signature for differentiating the definitions. (More...)

Define precondition and post-condition to a member function.

  
Precondition:
A precondition is a condition that must be true on entry to a member function. A class is used correctly if preconditions are never false. An operation is not responsible for doing anything sensible if its precondition fails to hold.
For example, the interface invariants of stack class say nothing about pushing yet another element on a stack that is already full. We say that isful() is a precondition of the push operation.


Post-condition:
A post-condition is a condition that must be true on exit from a member function if the precondition was valid on entry to that function. A class is implemented correctly if post-conditions are never false.
For example, after pushing an element on the stack, we know that isempty() must necessarily hold. This is a post-condition of the push operation. (More...)

Define the "integrity rules"

  
There are two Integrity rules.
1.Entity Integrity: States that "Primary key cannot have NULL value"

2.Referential Integrity: States that "Foreign Key can be either a NULL value or should be Primary Key value of other relation. (More...)

Yield keyword in C Sharp

  
C Sharp and yield keyword

Hi,



One of the cool and yet most unknown feature of the C# is the yield keyword. The yield keyword is used in an iterator block to provide a value to the enumerator object or to signal the end of the iteration. When used the expression is evaluated and returned as a value to the enumerator object. Note the expression has to be implicitebly convertible to yield type of the iterator. Here is an example



public static IEnumerable GetIntCollectionFromString(string SomeString){ string[] val = SomeString.Split(' '); int intToAdd; foreach (string token in val) { if (int.TryParse(token, out intVal)) { yield return intVal; } else { yield break; } }}

Here since we are using the yield keyword the function will return the collection of intVal instead of the value of intVal. The statement will only return when the iteration of the loop is complete.



There are some limitation with the yield keywords.

Unsafe blocks are not allowed
Parameters to the method, operator, or accessor cannot be ref or out. (More...)

What is the use of param keyword in C#?

  
In C# param parameter allows us to create a method that may be sent to a set of identically typed arguments as a single logical parameter. (More...)

what is the purpose of "base" keyword in c# ?

  
There are two uses
1) used to access a base class constructor
2) used to access a base class member in the derived class. (More...)

What is the use of stackalloc keyword in C#?

  
In an unsafe context it is used to allocate C# array directly on the stack. (More...)

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