trouble with constructor

[ankitamca85]

Public class class1
{
public class1(int i)
{
    messagebox.show(“parent class”);
}
}
 
public class class2:class1
{
public void xyz()
{
messagebox.show(“child class”);
}
}
 

why error coming-no overload for method class1 takes 0 arguments

why not implicitly creating default const for base class

Public class class1
{
}
 
public class class2:class1
{
public void xyz()
{
messagebox.show(“child class”);
}
}
 

no error??why?

help me out!!!!!

[Plater]

It tells you exactly what the problem is. You do not have a constructor that takes no arguments.
If you look at the constructors of class1 in your first example, you will see that there is no default constructor for the class, only a constructor that takes an int.
You would need to add the default (no arguments) constructor.

[ankitamca85]

public class class1
{
public class1(int i)
{
messagebox.show("parent class");
}
}

o/p---parent class

here there is no need to explicitly define default constructor...

but in case below why it is need to define default constructor....


1. Public class class1
2. {
3. public class1(int i)
4. {
5. messagebox.show(“parent class”);
6. }
7. }
8.
9. public class class2:class1
10. {
11. public void xyz()
12. {
13. messagebox.show(“child class”);
14. }
15. }

[Plater]

A blank constructor is "assumed" when no other constructors are declared. As soon as you declare a constructor, the default constructor is no longer assumed.
Should not be hard.