lab2_5

#include <fstream>
#include <string>
#include <iostream>

using namespace std;

void chooseInput(int& inputType)
{
    bool incorrect;
    string line;
    do
    {
        incorrect = false;
        cout << "Do you want to input from file? (y/n)" << endl;
        cin >> line;
        if (line != "Y" && line != "y" && line != "N" && line != "n")
        {
            incorrect = true;
            cout << "Enter valid answer" << endl;
        }
    } while (incorrect);
    if (line == "N" || line == "n")
        inputType = 1;
    else
        inputType = 0;
}

string inputFileLocation()
{
    bool incorrect = false;
    string location = "";
    cout << "Enter file location:" << endl;
    cin >> location;
    ifstream file(location);
    if (file.is_open())
    {
        cout << "File opened successfully\n";
        return location;
    }
    else
    {
        cout << "File with this location is not found" << endl;
    }
    file.close();
}

int getSizeFromFile()
{
    int size = 0;
    string line;
    ifstream file(inputFileLocation());
    file.clear();
    file.seekg(0, ios::beg);
    file >> size;
    getline(file, line, '\n');
    file.close();
    return size;
}

void outputToFile(int** triangle, int size)
{
    ofstream file(inputFileLocation());
    for (int i = 0; i < size; i++)
    {
        for (int j = 0; j < i; j++)
        {
            file << triangle[i][j] << endl;
        }
        cout << endl;
    }
}

void createTriangle(int size, int** triangle) {
    for (int n = 0; n <= size; n++) {
        triangle[n][0] = triangle[n][n] = 1;
        for (int k = 1; k < n; k++) {
            triangle[n][k] = triangle[n - 1][k - 1] + triangle[n - 1][k];
        }
    }
}

int getSizeFromConsole()
{
    const int MAX_VALUE = 30;
    const int MIN_VALUE = 1;
    int size = 0;
    bool isIncorrect;
    do
    {
        cin >> size;
        isIncorrect = false;
        if (size < MIN_VALUE || size > MAX_VALUE)
        {
            isIncorrect = true;
            cout << "Please enter a natural value less than six\n";
        }
    } while (isIncorrect);
    return size;
}

void printTriangle(int** triangle, int size)
{
    for (int i = 0; i < size + 1; i++)
    {
        for (int j = 0; j < i; j++)
            cout << triangle[i][j] << " ";
        cout << endl;
    }
}

int main()
{
    setlocale(LC_ALL, "RUSSIAN");
    cout << "Данная программа строит треугольник Паскаля заданного размера.\n";
    int chosenInput;
    int size = 0;
    chooseInput(chosenInput);
    cout << "Enter the size of Pascal`s triangle\n";
    if (chosenInput == 0)
    {
        size = getSizeFromFile();
    }
    else
    {
        size = getSizeFromConsole();
    }
    cout << endl;
    int** triangle = new int* [size + 1];
    for (int i = 0; i < size + 1; i++)
        triangle[i] = new int [size + 1];
    cout << "Triangle:" << endl;
    createTriangle(size, triangle);
    cout << endl << "Pascal`s triangle" << endl;
    printTriangle(triangle, size);
    outputToFile(triangle, size);
}