lab1.2 java

import java.util.Scanner;
public class Main
{
    public static void main(String[]args)
    {
        int a = 1, b = 1, n = 0;
        Scanner in = new Scanner(System.in);
        boolean IsCorrect;
        System.out.print("The program will calculate the n-th term of the Fibonacci series.\n");
        System.out.print("Enter the Fibonacci series member number: ");
        do
        {
            IsCorrect = false;
            try {
                n = Integer.parseInt(in.next());
            }
            catch (NumberFormatException e) {
                System.out.print("Incorrect value. Enter the number: ");
                IsCorrect = true;
            }
            if ((!IsCorrect) && (n == 0) || (n < 0))
            {
                System.out.print("Incorrect value. Enter the number: ");
                IsCorrect = true;
            }
        } while (IsCorrect);
        in.close();
        for (int i = 2; i < n; i++)
        {
            b = a + b;
            a = b - a;
        }
        System.out.print(b);

    }
}