Thread: improve this cpp code?

I need to improve this code.
any suggestions?

Code:

class Foo
{
public:
virtual void func() const = 0;
};
class Bar: public Foo
{
public:
Bar(): data (new int[10]) ()
~Bar() {}
void func() const{
data++;
}
int get()
{
return data;
}
private:
int *data;
};
Foo *foo = makeBar();
foo->func():
return 0;
}

Indentation is a good start

Can someone help me as I am new to C++ and still learning it. I see the below compile errors. how to fix it? any suggestions please.

main.cpp: In member function ‘virtual void Bar::func() const’:
main.cpp:23:5: error: increment of member ‘Bar::data’ in read-only object
data++;
^~
main.cpp: In member function ‘int Bar::get()’:
main.cpp:27:8: error: invalid conversion from ‘int*’ to ‘int’ [-fpermissive]
return data;
^~~~
main.cpp: At global scope:
main.cpp:32:20: error: ‘makeBar’ was not declared in this scope
Foo *foo = makeBar();
^
main.cpp:33:1: error: ‘foo’ does not name a type
foo->func():

this is full code...

Code:

#include <iostream>

using namespace std;
class Foo
{
public:
virtual void func() const = 0;
};
class Bar: public Foo
{
public:
Bar(): data (new int[10]) ()
~Bar() {}
void func() const{
data++;
}
int get()
{
return data;
}
private:
int *data;
};
Foo *foo = makeBar();
foo->func():
return 0;
}
int main()
{
    cout<<"Hello World";

    return 0;
}

I need to improve the code as it gives some compile errors...Need to fix them.

Need to improve the below code.

Code:

class Foo
{
public:
virtual void func() const = 0;
};
class Bar: public Foo
{
public:
Bar(): data (new int[10]) ()
~Bar() {}
void func() const{
data++;
}
int get()
{
return data;
}
private:
int *data;
};
Foo *foo = makeBar();
foo->func():
return 0;
}

Any suggestions here?

If you have an abstract function in the base class you need a virtual constructor.
c++ - When to use virtual destructors? - Stack Overflow

I also would replace the dynamic array with a std::vector.
std::array - Dynamic Memory, no Thanks - ModernesCpp.com