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Date
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Monday,
December 02, 2013
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Time
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Description
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10.00 am to 12.00 pm
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Structure,property,indexer
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Learning:
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Structure:-
Structures are used to represent a record.
User defined value types are known as
structures.Structures are stored on stack and contains values directly.
eg:-
struct cycle
{
Int val,
min_speed,max_speed;
};
Static void main(string[] args)
{
Cycle c;
c.val=10;
c.min_speed=30;
c.max_speed=50;
console..writeline(“max speed is {0}”,c.max_speed);
}
Features of c# structures:-
1)Structures
can have methods, fields, indexers, properties, events.
2)Structures
can have defined constructors and not destructors.however you cannot define a
default constructor to the structure.
3)Structure
members cannot be specified as abstract, virtual, protected.
Properties:-
Properties are named members of
classes,structures and interfaces.Member variable or methods in a class or
structure are called fields. Properties are an extension of fields and are
accessed using the same syntax. They use accessor through which the value can
be read and manipulated.
Accessor:- it contains executable
statements that helps in getting and setting the values of the properties.
Program:-
class Student
{
private string code = "N.A";
private string name = "not
known";
private int age = 0;
// Declare a Code property of type
string:
public string Code
{
get
{
return code;
}
set
{
code = value;
}
}
// Declare a Name property of type
string:
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
// Declare a Age property of type int:
public int Age
{
get
{
return age;
}
set
{
age = value;
}
}
public override string ToString()
{
return "Code = " + Code +",
Name = " + Name + ", Age = " + Age;
}
}
class ExampleDemo
{
public static void Main()
{
// Create a new Student object:
Student s = new Student();
// Setting code, name and the age of
the student
s.Code = "001";
s.Name = "Zara";
s.Age = 9;
Console.WriteLine("Student
Info: {0}", s);
//let us increase age
s.Age += 1;
Console.WriteLine("Student
Info: {0}", s);
Console.ReadKey();
}
}
}
Output:-
Student Info: Code = 001, Name = Zara, Age = 9 Student Info: Code = 001, Name = Zara, Age = 10
Indexer:-
An indexer allows an object to be indexed as an
array. When an indexer is defined for a class then class behaves like a
virtual array. The instance of the class can be accessed by array access
operators([ ]).
Program:-
class IndexedNames { private string[] namelist = new string[size]; static public int size = 10; public IndexedNames() { for (int i = 0; i < size; i++) namelist[i] = "N. A."; } public string this[int index] { get { string tmp;
if( index >= 0 && index <= size-1 ) { tmp = namelist[index]; } else { tmp = ""; }
return ( tmp ); } set { if( index >= 0 && index <= size-1 ) { namelist[index] = value; } } }
static void Main(string[] args) { IndexedNames names = new IndexedNames(); names[0] = "Zara"; names[1] = "Riz"; names[2] = "Nuha"; names[3] = "Asif"; names[4] = "Davinder"; names[5] = "Sunil"; names[6] = "Rubic"; for ( int i = 0; i < IndexedNames.size; i++ ) { Console.WriteLine(names[i]); } Console.ReadKey(); } } }
Output :-
Zara Riz Nuha Asif Davinder Sunil Rubic N. A. N. A. N. A. |
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