Q1. Can u call a method
which is exist in two interfaces with same name and inherit both interfaces by
the class?
Ans: No, call would be
ambiguous. It will be difficult to identify that which method is called for the
object.
You can understand by
this code-
using System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Text;
namespace
ConsoleApplication1
{
interface
pankaj11
{
abstract int method();
}
interface
pankaj12
{
abstract int method();
}
class
interfacechecking:pankaj11,pankaj12
{
abstract int method()
{
Console.WriteLine(90);
}
abstract int method()
{
Console.WriteLine(700);
}
static void Main(string[] args)
{
interfacechecking ob = new
interfacechecking();
ob.method();
Console.WriteLine();
}
}
}
2. Difference between Structure and Class
1. Structure is value type and class is reference
type
2. Structure does not support inheritance but a class
supports.
3. To make a structure we use Struct key word while
to make a class we use Class keyword
4. Structs are
always derived from System.ValueType. They can also derive from any number of
interfaces.
5. Classes are
always derived from one other class of your choosing. They can also derive from
any number of interfaces.
6. Class members are stored in heap but structure
members are stored in Stack.
3. Difference between Value Type and Reference type
Data in C# is stored in a variable in one of two ways,
depending on the type of the variable. This type will fall into one of two
categories: reference or value. The difference is as follows:
1. Value types store themselves and their content in one place in
memory.
2. Reference types hold a reference to
somewhere else in memory (called the heap) where content is stored.
3. One key difference between value types
and reference types is that value types always contain a value, whereas
reference types can be null.
4. Constructor:
Constructor is a special kind of a method which has the same name as
the class name and no parameter (making it the default constructor for the
class). A private default constructor, meaning that object instances of this
class cannot be created using this constructor.
class MyClass
{
public MyClass()
{
// Default constructor code.
}
public MyClass(int myInt)
{
// Nondefault constructor code (uses myInt).
}
}
4. What is abstract class?
Abstract
class is class that is never instantiated and must be inherited by other class.
It makes with the help of using abstract keyword.
Example:
abstract
class PanakjAbs
{
int
sum(int a, int b);
}
Class
pankaj2:PanakjAbs
{
int
sum(int s, int h)
{
return
a+b;
}
Static
void main(strings []args)
{
Panakj2
ob=new Panakj2();
int
result=ob.sum(23,33);
Console.writeLine(result);
Console.Readkey();
}
}
5.
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