Lab_3

Лабораторная №3:
Array.cpp:

#include <iostream>
#include <string>
#include <cstdio>
#include "Array.h"

//Methods for class "Array:

//Creating Array.
void Array::createArray(){
    cout << "\n\tStarting creating of array. Enter size (should be >= 0):" << endl << "-> ";
    cin >> size;
    if(size < 0){ //Checking size.
        cout << "\n\n\t\aError #I1: Size of array shouldn't be less, than 0! And you entered: " << size << "." << endl;
        exit(11);
    }
    //Creating array.
    element = new Element[size];
    for(int i = 0; i < size; i++){
        element[i].setValue("0");
    }
}

//Entering Array.
void Array::enterArray(){
    cout << "\nStarted entering of array.\n" << endl;
    cout << "Array size is: " << size << ".\n";
    cout << "Now enter values for each element of array: " << endl;
    string tmp = "";
    for(int i = 0; i < size; i++){ //Cycle for entering array of elements.

        retry1: //***LABEL RETRY1***This label is using if the user entered an empty string.

        element[i].setValue(""); //Just to make right retry.
        cout << "Element [" << i+1 << "] = "; //Beautiful printing.
        cin >> tmp;
        element[i].setValue(tmp);//Entering values.
        if(element[i].getValue() == ""){ //If entered value is null .

            retry2: //***LABEL RETRY2***This label is using if the user entered something other than Y or N.

            tmp = ""; //Just to have right checking.
            cout << "\nAre You shure, that this element is empty? (Y/N): ";
            cin >> tmp;
            if(tmp == "Y") continue; //If Y: Continuing to next iteration.
            else if(tmp == "N") goto retry1; //If N: Allow the user to enter the value again by going to label "retry1".
            else {
                cout << "Error #I2: You should answer with Y or N. (Your answer is: " << tmp << "). Try again." << endl; //If not Y or N:
                goto retry2;                                                            //Moving user to label "retry2".
            }
        }
    }
    cout << "\nNice. Array was successfully created." << endl;
}

//Printing array.
void Array::showArray() const {
    cout << "Size: " << size << endl;
    cout << "Array:\n{\n" << endl;
    for(int i = 0; i < size; i++){
        cout << "\tElement [" << i+1 << "] = " << element[i].getValue() << ";\n";
    }
    cout << "}" << endl;
}

//Add element to array.
void Array::addElement(){
    cout << "\nStarted adding element." << endl;
    Element *temp = new Element[size + 1]; //Creating temporary array to add element.
    for(int i = 0; i < size; i++){
        temp[i].setValue(element[i].getValue()); //Copying all elements from Array.
    }
    string v;
    size++; //Increasing size.
    delete[] element; //Deleting pointer.
    element = temp; //Now element is pointer for bigger array.
    temp = 0;
    retry1: //***LABEL RETRY1***This label is using if the user entered an empty string.
    cout << "\nNow enter value of element, which you want to add:" << endl << "-> ";
    cin >> v;
    element[size-1].setValue(v);
    if(element[size-1].getValue() == ""){ //If entered value is null .

        retry2: //***LABEL RETRY2***This label is using if the user entered something other than Y or N.
        string tmp = ""; //Just to have right checking.
        cout << "\nAre You shure, that this element is empty? (Y/N): ";
        cin >> tmp;
        if(tmp == "N") goto retry1; //If N: Allow the user to enter the value again by going to label "retry1".
        else if(tmp != "Y"){
            cout << "Error #I2: You should answer with Y or N. (Your answer is: " << tmp << "). Try again." << endl; //If not Y or N:
            goto retry2;                                                            //Moving user to label "retry2".
        }
    }
    cout << "\nAdding new element ended successfully.\n";
}

//Checking occurence of element in array.
bool Array::checkOccurenceOfElement(string tmp) const {
    for(int i = 0; i < size; i++){
        if(tmp == element[i].getValue()) return true;
    }
    return false;
}

//Removing element.
void Array::removeElement(){
    cout << "\nStarted removing of element." << endl;
    this->showArray();
    cout << "If you want to delete element by index, enter 1. \nIf you want to remove element by value, enter 2." << endl;
    cout << "Your answer -> ";
    int check = 0;
    Element *temp;
    cin >> check;
    switch(check){
        case 1: //If user decided to delete element by index in array.
        {
            int index = 0;
            cout << "\nDeleting element by index." << endl;
            cout << "Now enter index of element, you want to delete: ";
            cin >> index;
            if(index <= 0 || index > size) { //Checking index to be right.
                cout << "\nError #I3: Index should be less, than " << size << ", and bigger, than 0." << endl;
                exit(13);
            }
            for(int i = index - 1; i < size-1; i++) //If checked successfull, deleting:
                element[i].setValue(element[i+1].getValue()); //In result: last element will be not needed.
            Element *temp = new Element[size-1]; //creating temporary object to decreese size of array
            for(int i = 0; i < size-1; i++)
                temp[i].setValue(element[i].getValue()); //Copying to temp
            delete[] element; //Clearing original
            element = temp; //Pointing original to temp
            size--; //Minus size;
            temp = 0; //"Destroying temp"
            cout << "\nSuccessfully removed.\n";
            break;
        }
        case 2:
        {
            cout << "\Deleting element by value." << endl;
            cout << "Enter value of element, which you need to remove: ";
            string inStr; //Creating buffer string
            cin >> inStr;
            if(!this->checkOccurenceOfElement(inStr)) { //checking for occurence
                cout << "\nElement not found." << endl;
                break;
            }
            int tInd; //if element found getting
            for(int i = 0; i < size; i++){
                if(element[i].getValue() == inStr) //if element equals to needed
                    tInd = i;                      //remember it's index
            }
            for(int i = tInd; i < size-1; i++)
                element[i].setValue(element[i+1].getValue()); //moving elements for 1 to left (with destroying needed element)
            Element *temp = new Element[size-1]; //same as with indexes
            for(int i = 0; i < size-1; i++)
                temp[i].setValue(element[i].getValue());
            delete[] element;
            size--;
            element = temp;
            temp = 0;

            cout << "\nSuccessfully removed.\n";
            break;
        }
        default: { //If user's answer != 1 or 2
            cout << "\nError #I4: Your answer should be 1 or 2.\n";
            exit(14);
            break;
        }
    }
}

Array operator+(const Array& a1, const Array& a2){ //reloading operator + (adding two arrays)
    Array a3; //resulting
    Array temp; //temporary
    temp.size = a1.size + a2.size; //Getting bigger size to be shure
    temp.element = new Element[temp.size];
    //Getting only all elements together into one array, but if a1[i] == a2[i], it will be getted only once
    int j = 0;
    for(int i = 0; i < a1.size; i++){
        if(!a2.checkOccurenceOfElement(a1.element[i].getValue())){
            temp.element[j].setValue(a1.element[i].getValue());
            j++;
        }
    }
    a3.size = j + a2.size;
    a3.element = new Element[a3.size];
    for(int i = 0; i < j; i++){
        a3.element[i].setValue(temp.element[i].getValue());
    }
    for(int i = 0; i < a2.size; i++){
        a3.element[j].setValue(a2.element[i].getValue());
        j++;
    }
    return a3;
}

Array& Array::operator =(const Array& a){ //Assignment operator.
    this->size = a.size;
    this->element = new Element[this->size];
    for(int i = 0; i < this->size; i++)
        this->element[i].setValue(a.element[i].getValue());
    return *this;
}

Array operator *(const Array& a1, const Array& a2){ //Intersection of two arrays
    Array a3;
    Array temp;
    temp.size = a1.size + a2.size;
    temp.element = new Element[temp.size];

    int j = 0;
    for(int i = 0; i < a1.size; i++){
        if(a2.checkOccurenceOfElement(a1.element[i].getValue())){
            temp.element[j].setValue(a1.element[i].getValue());
            j++;
        }
    }
    a3.size = j;
    a3.element = new Element[a3.size];
    for(int i = 0; i < j; i++){
        a3.element[i].setValue(temp.element[i].getValue());
    }
    return a3;
}

Array operator -(const Array& a1, const Array& a2){ //Difference of two arrays
    Array a3;
    Array temp;
    temp.size = a1.size + a2.size;
    temp.element = new Element[temp.size];

    int j = 0;
    for(int i = 0; i < a1.size; i++){
        if(!a2.checkOccurenceOfElement(a1.element[i].getValue())){
            temp.element[j].setValue(a1.element[i].getValue());
            j++;
        }
    }
    for(int i = 0; i < a2.size; i++){
        if(!a1.checkOccurenceOfElement(a2.element[i].getValue())){
            temp.element[j].setValue(a2.element[i].getValue());
            j++;
        }
    }
    a3.size = j;
    a3.element = new Element[a3.size];
    for(int i = 0; i < j; i++){
        a3.element[i].setValue(temp.element[i].getValue());
    }
    return a3;
}

Array.h:
#pragma once
#include <iostream>
#include <string>
#include <cstdio>

using namespace std;

class Element
{
private:
    string value; //Value of element;
public:
    Element() { value = ""; } //Default constructor;
    Element(string inValue) { value = inValue; } //Condstructor with parameter;
    Element(const Element& el) { value = el.value; } //Copy constructor;
    string getValue() const {
        return value;
    }
    void setValue(string val){
        value = val;
    }
    ~Element() {   //Destructor
        value = "";//Just making this empty
    }
};


class Array
{
private:
    long int size; //Size of array
    Element *element; //pointer to create array of objects || example of agregation.
public:
    Array() { size = 1; }
    Array(long int inSize){//Constuctor with params;
        if(inSize < 0){ //Checking size.
            cout << "\n\n\tError #I1: Size of array shouldn't be less, than 0! And you entered: " << inSize << "." << endl;
            exit(11);
        }
        size = inSize;
    }
    Array(const Array& a){ //Copy constructor;
        size = a.size;
        element = a.element;
    }
    void createArray(); //Create array of Elements;
    void enterArray(); //Entering array of Elements;
    void showArray() const; //Printing all data about array;
    void addElement(); //Add one element to array;
    void removeElement(); //Remove one element from array;
    bool checkOccurenceOfElement(string) const; //Check if element is in array;
    Array& operator=(const Array&);
    friend Array operator +(const Array&, const Array&);
    friend Array operator *(const Array&, const Array&);
    friend Array operator -(const Array&, const Array&);
    ~Array(){ //destructor
        delete[] element;
        cout << "\n\n\t\tSYSINFO: Object deleted.\n\n";
    }

};

main.cpp:
#include <iostream>
#include <string>
#include <cstdio>
#include "Array.h"

int main()
{
    Array a1;
    a1.createArray();
    a1.enterArray();
    a1.showArray();

    /*
    Array a2;
    a2.createArray();
    cout << "***BEFORE OPERAION***" << endl;
    a2.showArray();
    a2 = a1;
    cout << "***AFTER OPERAION***" << endl;
    a2.showArray();
    */

    Array a3;
    a3.createArray();
    a3.enterArray();
    a3.showArray();

    Array a4;

    /*
    a4 = (a3 + a1);
    cout << "Doing +: " << endl;
    a4.showArray();
    */

    /*
    a4 = (a3*a1);
    cout << "Doing *: " << endl;
    a4.showArray();
    */

    a4 = (a3-a1);
    cout << "Doing -: " << endl;
    a4.showArray();

    return 0;
}