Help with creating a derived c++ class

Hello everyone! I am need of assistance with creating a derived class. I have the following abstract base class:

Code:

class Field{
    public:
    virtual void display() = 0;
    virtual int edit() = 0;
    virtual bool editable() const = 0;
    virtual void *data() = 0;
    virtual Field *clone() const = 0;
};

I need to make a derived class with the following specification:

This is how I have my derived class in my header file:

Code:

class LField : public Field{
    int row_loc, col_loc, width_tot, index;
    char *initval;
    bool edib;
    
    public:
        LField(int row, int col, int width);
        LField(int row, int col, int width, char *s);
        LField(int row, int col, int width, char *s, bool editable);
        void initialize(int r, int c, int w, bool e);
        ~LField();
        void display();
        int edit();
        bool editable() const;
        void *data();
        Field *clone() const;
        LField& operator = (const LField & rhs);
        LField(const LField & source );
}

This is what I have done so far:

Code:

LField::LField(int row, int col, int width){
    //Checks for valid coords
    if(row < 0){
        row = 0;
    }
    if(row > dtioRows()){
        row = dtioRows() - 1;
    }
    if(col < 0){
        col = 0;
    }
    if(col > dtioColumns()){
        col = dtioColumns() - 1;
    }
    //Checks for width and location
    if((col + width) > dtioColumns()){
        width = width - ((col + width) - dtioColumns());
    }
    
    initialize(row, col, width, true);
    initval = NULL;
}
LField::LField(int row, int col, int width, char *s){
    //Checks for valid coords
    if(row < 0){
        row = 0;
    }
    if(row > dtioRows()){
        row = dtioRows() - 1;
    }
    if(col < 0){
        col = 0;
    }
    if(col > dtioColumns()){
        col = dtioColumns() - 1;
    }
    //Checks for width and location
    if((col + width) > dtioColumns()){
        width = width - ((col + width) - dtioColumns());
    }
    initialize(row, col, width, true);
    if(strlen(s) > width){
        initval = new char[width];
        for(int i = 0; i < width; i++){
            initval[i] = s[i];
        }
    }
    else{
        initval = new char[strlen(s) + 1];
        strcpy(initval, s);
    }
    
}
LField::LField(int row, int col, int width, char *s, bool editable){
    //Checks for valid coords
    if(row < 0){
        row = 0;
    }
    if(row > dtioRows()){
        row = dtioRows() - 1;
    }
    if(col < 0){
        col = 0;
    }
    if(col > dtioColumns()){
        col = dtioColumns() - 1;
    }
    //Checks for width and location
    if((col + width) > dtioColumns()){
        width = width - ((col + width) - dtioColumns());
    }
    initialize(row, col, width, editable);
    if(strlen(s) > width){
        initval = new char[width];
        for(int i = 0; i < width; i++){
            initval[i] = s[i];
        }
    }
    else{
        initval = new char[strlen(s) + 1];
        strcpy(initval, s);
    }
}
//Function that initializes LField
void LField::initialize(int r, int c, int w, bool e){
    row_loc = r;
    col_loc = c;
    width_tot = w;
    edib = e;
    index = 0;
}

I am unsure if what I am doing is correct and would like some input. If there is something that has to be changed or corrected please tell me. Any input is greatly appreciated!

 

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