Dictionary, C++ (gcc)

Dictionary

//g++  5.4.0

#include <iostream>
#include <string>

class Entry
{
    private:
    int _key;
    std::string _str;
    
    public:
    Entry() {}
    ~Entry() {}
    Entry(int key, std::string str){
        this->_key = key;
        if (str.length() <= 30){
            this->_str = str;
        }
        else {
            std::cout << "String is too large.\n";
        }
    }
    
    int getKey() const { return _key; }
    std::string getString() const { return _str; }
};

class Dictionary
{
    public:
    Dictionary()
    {
        for (int i = 0; i < 5; i++){
            arr[i] = nullptr;
        }
    }
    ~Dictionary() {}
    
    void add(int key, std::string s)
    {
        Entry e(key, s);
        Entry *p = &e;
        for (int i = 0; i < 5; i++)
        {
            if (arr[i] == nullptr) {
                arr[i] = p;
            }
        }
    }
    
    void remove(int key)
    {
        for (int i = 0; i < 5; i++){
            if (arr[i]->getKey() == key){
                if (i == 5){
                    delete arr[i];
                    break;
                }
                else{
                    for (int j = i; j < 5; j++){
                        arr[j] = arr[j+1];
                    }
                    break;
                }
            }
        }
    }
    
    Entry* getEntry(int key){
        for (int i = 0; i < 5; i++){
            if (arr[i]->getKey() == key){
                return arr[i];
            }
        }
        std::cout << "Entry does not exist.\n";
        return nullptr;
    }
    
    Entry* getEntryByIndex(int index){
        return arr[index];
    }
            
    Entry* searchFor(int key);
    
    private:
    Entry *arr[5];
};

int main()
{
    Dictionary d;
    d.add(1, "Hello");
    d.add(2, "World");
    d.add(3, "Good");
    d.add(4, "Morning");
    
    Entry *test = d.getEntryByIndex(2);
    
}


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