lab2.2 java

import java.util.Scanner;

public class Main {

    public static int readNumPositive()
    {
        int num;
        num = -1;
        boolean isIncorrect;
        Scanner scan = new Scanner(System.in);
        do {
            isIncorrect = false;
            try
            {
                num = 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) && (num < 0))
            {
                System.err.print("A number less than two was entered. Enter a valid
                                  value: ");
                isIncorrect = true;
            }
        } while (isIncorrect);
        return num;
    }

    public static int countRoot(int num) {
        return (int)Math.round(Math.cbrt((double)num));

    }

    public static int showCombinations(int MAX, int num) {
        int x;
        int y;
        int z;
        int k;
        k = 0;
        MAX++;
        for (x = 0; x < MAX; x++) {
            for (y = 0; y < MAX; y++) {
                for (z = 0; z < MAX; z++) {
                    if ((x * x * x) + (y * y * y) + (z * z * z) == num) {
                        System.out.println(x + " " + y + " " + z);
                        k++;
                    }
                }
            }
        }
        return k;
    }

    static void showResult(int k) {
        if (k != 0) {
            System.out.print("Finite number of combinations: " + k);
        }
        else {
            System.out.print("There are no combinations.");
        }
    }

    static void whatDoesTheProgramDo() {
        System.out.println("The program indicates all triples of numbers X, Y, Z,
                            that satisfy the condition: X^3 + Y^3 + Z^3 = Num.");
    }


    public static void main(String[]args) {
        int num;
        int x;
        int y;
        int z;
        int k;
        int MAX;
        whatDoesTheProgramDo();
        k = 0;
        System.out.print("Enter the number: ");
        Scanner scan = new Scanner(System.in);
        num = readNumPositive();
        scan.close();
        MAX = countRoot(num);
        k = showCombinations(MAX, num);
        showResult(k);
    }
}