Constructor in C++

[Allerdyce.John]

Hi,

I have 2 classes:

class A {
public:
A();
A(int i);
};

class B: public A {
pubilc:
B(int i);
};

If I don't have constructor B(), does it call A() automatically?

Can I do this:
B b; // B does not have default constructor but A has.

[Alf P. Steinbach]

* Al************@gmail.com:

Hi,

I have 2 classes:

class A {
public:
A();
A(int i);
};

class B: public A {
pubilc:
See <url: http://www.google.com/search?q=pubilc>.

B(int i);
};

If I don't have constructor B(), does it call A() automatically?
If you don't have a constructor B() it doesn't exist; C++ only generates
one for you if you don't declare any constructors at all.

Can I do this:
B b; // B does not have default constructor but A has.

Nope.
--
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Q: Why is it such a bad thing?
A: Top-posting.
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[Allerdyce.John]

If I have
class A {
public
A(int i);
}

public B{
public:
virtual void abstractFunciton = 0;
}

public C{
public:
C(int i);
};

how can I call A' constructor A(int i) from C(int i).

I try
C::C(int i): A(i) {
}
it does not compile.

[Alf P. Steinbach]

* Al************@gmail.com:

If I have
class A {
public
A(int i);
}

public B{
public:
virtual void abstractFunciton = 0;
}

public C{
public:
C(int i);
};

how can I call A' constructor A(int i) from C(int i).

I try
C::C(int i): A(i) {
}
it does not compile.

C does not derive from A.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

[Victor Bazarov]

Al************@gmail.com wrote:

If I have
class A {
public
A(int i);
} ;
public B{
public:
virtual void abstractFunciton = 0;
virtual void pureFunction() = 0;
} ;
public C{
public:
C(int i);
};

how can I call A' constructor A(int i) from C(int i).

I try
C::C(int i): A(i) {
}
it does not compile.

You need to derive 'C' from 'A' first to do that.

V
--
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