110 lines
2.8 KiB
Java
110 lines
2.8 KiB
Java
package OOP.Java.lab_2;
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import org.jetbrains.annotations.Contract;
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import org.jetbrains.annotations.NotNull;
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import java.util.Scanner;
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public class lab_2 {
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public static short protectedInput(String inputPrompt, String errorMessage, Scanner input) {
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short read_variable;
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do {
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try {
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System.out.println();
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System.out.print(inputPrompt);
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read_variable = input.nextShort();
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break;
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} catch (Exception e) {
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System.out.println(errorMessage);
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input.nextLine();
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}
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} while (true);
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return read_variable;
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}
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@NotNull
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public static String format(int number) {
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int width = String.valueOf(number).length() + 1;
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return "|%" + width + "d ";
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}
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@Contract(pure = true)
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public static double average(@NotNull short[] row) {
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short sum = 0;
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for (short element : row) {
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sum += element;
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}
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return (double) sum / row.length;
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}
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public static void main(String[] args) {
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short rows, columns;
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Scanner input = new Scanner(System.in);
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final short a = protectedInput("Input a constant to multiply a matrix by: ",
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"A constant must be a short-data type integer, try again.", input);
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System.out.println();
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System.out.println("Input size of the matrix.");
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do {
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rows = protectedInput("Rows: ",
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"A number of rows must be a short-data type integer, try again.", input);
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} while (rows <= 0);
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do {
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columns = protectedInput("Columns: ",
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"A number of columns must be a short-data type integer, try again.", input);
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} while (columns <= 0);
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input.close();
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short[][] matrix_B = new short[rows][columns];
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System.out.println();
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System.out.println("Matrix B:");
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String format = format(rows * columns);
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for (short i = 0; i < rows; i++) {
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for (short j = 0; j < columns; j++) {
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matrix_B[i][j] = (short) ((i + 1) * (j + 1));
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System.out.printf(format, matrix_B[i][j]);
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}
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System.out.println("|");
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}
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System.out.println();
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System.out.println("Matrix a×B:");
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format = format(rows * columns * a);
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for (short i = 0; i < matrix_B.length; i++) {
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for (short j = 0; j < matrix_B[i].length; j++) {
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matrix_B[i][j] *= (a);
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System.out.printf(format, matrix_B[i][j]);
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}
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System.out.println("|");
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}
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System.out.println();
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System.out.println("Averages of each row:");
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for (short[] row : matrix_B) {
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System.out.println(average(row));
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}
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}
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}
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