[Solved] Problem converting one user-defined class to another user-defined class [closed]

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When Float(const Integer&); is declared, the Integer class has been not declared yet.

This should work for what you want:

#include <iostream>
using namespace std;

class Integer;

class Float
{
    float x, y;
public:
    Float() : x(0),y(0) {}
    Float(float a, float b) : x(a),y(b) {}
    Float(const Integer&);
    float getX() const { return this->x; }
    float getY() const { return this->y; }
    float summa()
    {
        return this->x + this->y;
    }
};

class Integer
{
    int v, w;
public:
    Integer() : v(0),w(0) {}
    Integer(int a, int b) : v(a),w(b) {}
    Integer(const Float&);
    int getV() const { return this->v; }
    int getW() const { return this->w; }
    int summa()
    {
        return this->v + this->w;
    }
};

int main()
{
    Integer i(5, 2);
    Float f = i;
    Float F(3.23, 5.78);
    Integer I = F;
    cout << f.summa();
    cout << I.summa();
    return 0;
}

Float::Float(const Integer& i)
{
    this->x = (float)(i.getV());
    this->y = (float)(i.getW());
}

Integer::Integer(const Float& f)
{
    this->v = (int)(f.getX());
    this->w = (int)(f.getY());
}

solved Problem converting one user-defined class to another user-defined class [closed]