Problem in Constructors

Posted by gurramsra1-10894 under C# on 2/5/2012 | Points: 10 | Views : 3648 | Status : [Member] | Replies : 7

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Why the following code shows error like...
Error 1 'ConsoleApplication1.A' does not contain a constructor that takes '0' arguments.
Please help me.... the code is.....

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
public class A
{
int a, b;

public A(int p, int q)
{
a = p;
b = q;
Console.WriteLine( a + b);

}
public int add()
{

return a + b;

}

}
public class B:A
{
int c, d;

public B()
{
c = 2;
d = 1;

}
public B(int x, int y)
{
c = x;
d = y;
}
public int sub()
{
return c - d;
}
}
class Program
{
static void Main(string[] args)
{

B b = new B(15,10);

Console.WriteLine(b.add());
Console.WriteLine(b.sub());
Console.Read();
}
}
}

Sra1

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Posted by: Anand on: 2/5/2012 [Member] Starter | Points: 25

0	same error i got does anyone knows the solution for this :) - gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Anand on: 2/5/2012 [Member] Starter | Points: 25

0	just see whether this is right or not using System; public class A { int a, b; public A(int p, int q) { a = p; b = q; Console.WriteLine(a + b); } public int add() { return a + b; } } public class B : A { int c, d; //public B() //{ // c = 2; // d = 1; //} public B(int x, int y):base( x, y) { c = x; d = y; } public int sub() { return c - d; } } class Program { static void Main(string[] args) { B b = new B(15, 10); Console.WriteLine(b.add()); Console.WriteLine(b.sub()); Console.Read(); } } - gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

just see whether this is right or not
using System;
public class A
{
int a, b;
public A(int p, int q)
{
a = p;
b = q;
Console.WriteLine(a + b);
}
public int add()
{
return a + b;
}
}
public class B : A
{
int c, d;
//public B()
//{
// c = 2;
// d = 1;
//}
public B(int x, int y):base( x, y)

{
c = x;
d = y;
}
public int sub()
{
return c - d;
}
}
class Program
{
static void Main(string[] args)
{

B b = new B(15, 10);

Console.WriteLine(b.add());
Console.WriteLine(b.sub());
Console.Read();
}
}

gurramsra1-10894, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Avdesh on: 2/5/2012 [Member] Starter | Points: 25

0	make a default constructor of class A the program will work fine thanks Regards AVDESH gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Sksingh on: 2/6/2012 [Member] Starter | Points: 25

0	Hi, Either make a default constructor of class A or you have to intialize class A construstor whereever inheritance taking place. Exp: public class B : A { int c, d; public B() :base(2,1) { c = 2; d = 1; } public B(int x, int y) :base(x,y) { c = x; d = y; } public int sub() { return c - d; } } Regards, Sunil gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

Hi,

Either make a default constructor of class A or you have to intialize class A construstor whereever inheritance taking place.
Exp:

public class B : A

    {

        int c, d;



        public B() :base(2,1)

        {

            c = 2;

            d = 1;





        }

        public B(int x, int y) :base(x,y)

        {

            c = x;

            d = y;

        }

        public int sub()

        {

            return c - d;

        }

    }

Regards,
Sunil

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Posted by: Anand on: 2/6/2012 [Member] Starter | Points: 25

0	i am not able to understnd - gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Avdesh on: 2/6/2012 [Member] Starter | Points: 25

0	using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { public class A { int a, b; public A////THIS IS DEFAULT CONSTRUCTOR OF CLASS A. I ADD THIS TO YOUR CODE ONLY { } public A(int p, int q) { a = p; b = q; Console.WriteLine( a + b); } public int add() { return a + b; } } public class B:A { int c, d; public B() { c = 2; d = 1; } public B(int x, int y) { c = x; d = y; } public int sub() { return c - d; } } class Program { static void Main(string[] args) { B b = new B(15,10); Console.WriteLine(b.add()); Console.WriteLine(b.sub()); Console.Read(); } } } run this code this code will work fine. THANKS REGARDS AVDESH gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
public class A
{
int a, b;
public A////THIS IS DEFAULT CONSTRUCTOR OF CLASS A. I ADD THIS TO YOUR CODE ONLY
{
}

public A(int p, int q)
{
a = p;
b = q;
Console.WriteLine( a + b);

}
public int add()
{

return a + b;

}

}
public class B:A
{
int c, d;

public B()
{
c = 2;
d = 1;

}
public B(int x, int y)
{
c = x;
d = y;
}
public int sub()
{
return c - d;
}
}
class Program
{
static void Main(string[] args)
{

B b = new B(15,10);

Console.WriteLine(b.add());
Console.WriteLine(b.sub());
Console.Read();
}
}
}

run this code this code will work fine.

THANKS REGARDS
AVDESH

gurramsra1-10894, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Anand on: 2/6/2012 [Member] Starter | Points: 25

0	thank u that worked out - gurramsra1-10894, if this helps please login to Mark As Answer. \| Alert Moderator

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