java lab2_1

import java.util.Scanner;
public class Main {
    public static void main(String[]args) {
        int i;
        int j;
        int k;
        int lengthArr;
        int[] arr;
        double nearestNum;
        double setValue;
        int buffer;
        boolean isInCorrect;
        k = 0;
        lengthArr = 0;
        nearestNum = 0;
        setValue = 0;
        Scanner scan = new Scanner(System.in);
        System.out.print("The program finds the number of the nearest member of the sequence to a given number.\n");
        System.out.print("Enter length of subsequence: ");
        do {
            isInCorrect = false;
            try {
                lengthArr = Integer.parseInt(scan.next());
            }
            catch (NumberFormatException e) {
                System.err.print("Symbols have been entered or exceeding permissible limits. Enter a valid value: ");
                isInCorrect = true;
            }
            if ((!isInCorrect) && (lengthArr < 2)) {
                System.err.print("A number less than two was entered. Enter a valid value: ");
                isInCorrect = true;
            }
        } while (isInCorrect);
        arr = new int[lengthArr];
        System.out.print("Enter elements of subsequence: ");
        for (i = 0; i < arr.length; i++) {
            do
            {
                isInCorrect = false;
                try {
                    arr[i] = Integer.parseInt(scan.next());
                }
                catch (NumberFormatException e) {
                    System.err.print("Symbols have been entered. Enter the number: ");
                    isInCorrect = true;
                }
                if ((!isInCorrect) && (arr[i] < -2000000000) && (arr[i] > 2000000000)) {
                    System.err.print("Exceeding permissible limits. Enter a valid value: ");
                    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 < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }

        System.out.print("\nEnter real value: ");
        do
        {
            isInCorrect = false;
            try {
                setValue = Double.parseDouble(scan.next());
            }
            catch (NumberFormatException e) {
                System.err.print("Symbols have been entered. Enter the number: ");
                isInCorrect = true;
            }
            if ((!isInCorrect) && ((setValue < -2000000000) || (setValue > 2000000000))) {
                System.err.print("Exceeding permissible limits. Enter a valid value: ");
                isInCorrect = true;
            }
        } while (isInCorrect);
        scan.close();

        if (setValue < arr[0]) {
            System.out.print("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]) {
                k++;
                System.out.print("The nearest element of the sequence numbered " + k);
            }
            else {
                isInCorrect = true;
                k++;
            }
        } while (isInCorrect);

    }
}