c++ lab2_1

#include <iostream>

int main()
{
    int i;
    int j;
    int k;
    int lengthArr;
    int buffer;
    double nearestNum;
    double setValue;
    bool isIncorrect;
    k = 0;
    lengthArr = 0;
    nearestNum = 0;
    setValue = 0;
    std::cout << "The program finds the number of the nearest member of the sequence to a given number.\n";
    std::cout << "Enter length of subsequence: ";
    do
    {
        isIncorrect = false;
        std::cin >> lengthArr;
        if (std::cin.fail())
        {
            std::cin.clear();
            while (std::cin.get() != '\n');
            isIncorrect = true;
            std::cerr << "Incorrect value. Enter the number: ";
        }
        if (!isIncorrect && std::cin.get() != '\n')
        {
            std::cin.clear();
            while (std::cin.get() != '\n');
            std::cerr << "Incorrect value. Enter the number: ";
            isIncorrect = true;
        }
        if (!isIncorrect && lengthArr < 2) {
            std::cerr << "Incorrect value (size must be > 1). Enter a valid value: ";
            isIncorrect = true;
        }
    } while (isIncorrect);
    int* arr = new int[lengthArr];

    std::cout << "Enter elements of subsequence: ";
    for (i = 0; i < lengthArr; i++) {
        do {
            isIncorrect = false;
            std::cin >> arr[i];
            if ((std::cin.fail()))
            {
                std::cin.clear();
                while (std::cin.get() != '\n');
                isIncorrect = true;
                std::cerr << "Incorrect value. Enter the number: ";
            }
            if (!isIncorrect && std::cin.get() != '\n')
            {
                std::cin.clear();
                while (std::cin.get() != '\n');
                std::cerr << "Incorrect value. Enter the number: " << std::endl;
                isIncorrect = true;
            }
        } while (isIncorrect);
    }

    for (i = 0; i < lengthArr - 1; i++)
    {
        for (j = i + 1; j < lengthArr; j++)
        {
            if (arr[i] > arr[j])
            {
                buffer = arr[i];
                arr[i] = arr[j];
                arr[j] = buffer;
            }
        }
    }

    for (i = 0; i < lengthArr; i++)
    {
        std::cout << arr[i] << " ";
    }

    std::cout << "\nEnter real value: ";
    do
    {
        isIncorrect = false;
        std::cin >> setValue;
        if (std::cin.fail())
        {
            std::cin.clear();
            while (std::cin.get() != '\n');
            isIncorrect = true;
            std::cerr << "Incorrect value. Enter the number: ";
        }
        if (!isIncorrect && std::cin.get() != '\n')
        {
            std::cin.clear();
            while (std::cin.get() != '\n');
            std::cerr << "Incorrect value. Enter the number: ";
            isIncorrect = true;
        }
        if (!isIncorrect && (setValue < -2000000000 || setValue > 2000000000))
        {
            std::cerr << "Incorrect value. Enter a valid value: ";
            isIncorrect = true;
        }
    } while (isIncorrect);

    if (setValue < arr[0])
    {
        std::cout << "The entered value is less than the smallest term of the sequence.";
    }
    else
    {
        nearestNum = arr[0];
        i = 0;
        while (setValue > arr[i])
        {
            k = i;
            i++;
        }
        nearestNum = arr[k];
    }

    do
    {
        isIncorrect = false;
        if (nearestNum < arr[k + 1])
            std::cout << "The nearest element of the sequence numbered " << k + 1;
        else
        {
            isIncorrect = true;
            k++;
        }
    } while (isIncorrect);

    delete[] arr;
    return 0;
}