Constructor doesn't work

[krutuk]

Hi everybody! I have a little program, but Derived constructor doesn't work. Please, can somebody help me?

#include <iostream>

class Base
{
public:
    Base(int temp) {variable = temp;}
protected:
    int variable;
};

class Derived: public Base
{
public:
    Derived(int temp) {variable = temp;}
};

int main()
{
    Derived d(25);

    return 0;
}

[vlad from moscow]

class Derived: public Base
{
public:
    Derived(int temp) : Base( temp ) {}
};

[vlad from moscow]

The other way is to define the derived class as

class Derived: public Base
{
public:
    using Base::Base;   
    Derived() = delete;
};

[krutuk]

Thanks for a help