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Which keyword use Structure Denoted in c#

Posted By :NATHAN ISRAEL     Posted Date :October 17, 2011    Points :40   Category :C# 
struct

You can also find related Interview Question to Which keyword use Structure Denoted in c#  below: 

What is data structure?

  
A data structure is a way of organizing data that considers not only the items stored, but also their relationship to each other. Advance knowledge about the relationship between data items allows designing of efficient algorithms for the manipulation of data. (More...)

What command is used to create a table by copying the structure of another table?

  
CREATE TABLE .. AS SELECT command

Explanation :

To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the following.
CREATE TABLE NEWTABLE AS SELECT * FROM EXISTINGTABLE WHERE 1=2;
If the WHERE condition is true, then all the rows or rows satisfying the condition will be copied to the new table. (More...)

How is the data structure of System R different from the relational structure?

  
Unlike Relational systems in System R
1.Domains are not supported
2.Enforcement of candidate key uniqueness is optional
3.Enforcement of entity integrity is optional
4.Referential integrity is not enforced (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...)

Which command is used to create a table by copying the structure of another table?

  
CREATE TABLE .. AS SELECT command
Example:-
CREATE TABLE AS SELECT*FROM WHERE 1=2; (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 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...)

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...)

C# delegate keyword is derived form which namespace?

  
C# delegate keyword is derived form System.MulticastDelegate. (More...)

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