OOP_IO-2x_2023-mirror/lab2

import java.util.Scanner;
import java.util.Random;

public class Lab2 {
    public static void main(String[] args) {
        int C5, C11, C7;
        int idbook = 2430;

        C5 = idbook % 5;
        C7 = idbook % 7;
        C11 = idbook % 11;

        System.out.println("C5 = " + C5 + " - Action between matrix is: C=a×B, a - const");
        System.out.println("C7 = " + C7 + " - The matrix elements type is: byte");
        System.out.println("C11 = " + C11 + " - The action with matrix C is: Find the matrix elements' average value");

        Scanner sc = new Scanner(System.in);
        System.out.print("\n Enter the number of rows: ");
        int rows = sc.nextInt();
        System.out.print(" Enter the number of columns: ");
        int cols = sc.nextInt();
        int min = 0;
        int max = 0;
        boolean valid = false;
        while (!valid) {
            System.out.print("\n Enter the minimum value of the matrix numbers (-128 to 127): ");
            min = sc.nextInt();
            System.out.print(" Enter the maximum value of the matrix numbers (-128 to 127): ");
            max = sc.nextInt();
            if (min >= -128 && max <= 127 && min < max) {
                valid = true;
            } else {
                System.out.println("\nInvalid input. Please enter the values again.");
            }
        }
        byte[][] matrix = new byte[rows][cols];
        Random rand = new Random();
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                matrix[i][j] = (byte) (rand.nextInt(max - min + 1) + min);
            }
        }
        System.out.println("\nThe matrix is:");
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                System.out.printf(" %-5d", matrix[i][j]);
            }
            System.out.println();
        }

        System.out.print("\nEnter the constant to multiply the matrix by: ");
        int constant = sc.nextInt();
        byte[][] multipliedMatrix = new byte[rows][cols];
        System.out.println(" The matrix multiplied by " + constant + " is:");
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                multipliedMatrix[i][j] = (byte) (matrix[i][j] * constant);
                System.out.printf(" %-5d", multipliedMatrix[i][j]);
            }
            System.out.println();
        }

        System.out.println("\n Press 'enter' to search for the average value of the matrix.");
        sc.nextLine();
        sc.nextLine();
        int sum = 0;
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                sum += multipliedMatrix[i][j];
            }
        }
        double average = (double) sum / (rows * cols);
        System.out.println("The average value of the multiplied matrix is: " + average);
    }
}