import java.util.Scanner;
public class Exercise08_14 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the length of a square matrix: ");
int n = input.nextInt();
int[][] board = new int[n][n];
boolean isSameOnARow = false, isSameOnAColumn java编程基础应用课后题 = false,
isSameOnADiagonal = false, isSameOnASubdiagonal = false;
for (int i = 0; i < board.length; i++) {
for (int j = 0; j < board[0].length; j++) {
board[i][j] = (int) (Math.random() * 2);
System.out.print(board[i][j]);
}
System.out.println();
}
// Check rows
for (int i = 0; i < board.length; i++) {
boolean same = true;
for (int j = 1; j < board[0].length; j++) {
if (board[i][0] != board[i][j]) {
same = false;
break;
}
}
if (same) {
System.out.println("All " + board[i][0] + "'s on row " + i);
isSameOnARow = true;
}
}
// Check columns
for (int j = 0; j < board[0].length; j++) {
boolean same = true;
for (int i = 1; i < board.length; i++) {
if (board[0][j] != board[i][j]) {
same = false;
break;
}
}
if (same) {
System.out.println("All " + board[0][j] + "'s on column " + j);
isSameOnAColumn = true;
}
}
// Check major diagonal
boolean same = true;
for (int i = 1; i < board.length; i++) {
if (board[0][0] != board[i][i]) {
same = false;
break;
}
}
if (same) {
System.out.println("All " + board[0][0] + "'s on major diagonal");
isSameOnADiagonal = true;
}
// Check subdiagonal
same = true;
for (int i = 1; i < board.length; i++) {
if (board[0][board.length - 1] != board[i][board.length - 1 - i]) {
same = false;
break;
}
}
if (same) {
System.out.println("All " + board[0][board.length - 1] + "'s on sub-diagonal");
isSameOnASubdiagonal = true;
}
if (!isSameOnARow)
System.out.println("No same numbers on a row");
if (!isSameOnAColumn)
System.out.println("No same numbers on a column");
if (!isSameOnADiagonal)
System.out.println("No same numbers on the major diagonal");
if (!isSameOnASubdiagonal)
System.out.println("No same numbers on the sub-diagonal");
}
}
// An alternative version without using break
//import java.util.Scanner;
//
//public class Exercise08_14 {
// public static void main(String[] args) {
// Scanner input = new Scanner(System.in);
// System.out.print("Enter the length of a square matrix: ");
// int n = input.nextInt();
//
// int[][] board = new int[n][n];
// boolean isSameOnARow = false, isSameOnAColumn = false,
// isSameOnADiagonal = false, isSameOnASubdiagonal = false;
//
// for (int i = 0; i < board.length; i++) {
// for (int j = 0; j < board[0].length; j++) {
// board[i][j] = (int) (Math.random() * 2);
// System.out.print(board[i][j]);
// }
//
// System.out.println();
// }
//
// // Check rows
// for (int i = 0; i < board.length; i++) {
// boolean same = true;
// for (int j = 1; j < board[0].length && same; j++) {
// if (board[i][0] != board[i][j]) {
// same = false;
// }
// }
// if (same) {
// System.out.println("All " + board[i][0] + "'s on row " + i);
// isSameOnARow = true;
// }
// }
//
// // Check columns
// for (int j = 0; j < board[0].length; j++) {
// boolean same = true;
// for (int i = 1; i < board.length && same; i++) {
// if (board[0][j] != board[i][j]) {
// same = false;
// }
//
// }
// if (same) {
// System.out.println("All " + board[0][j] + "'s on column " + j);
// isSameOnAColumn = true;
// }
// }
//
// // Check major diagonal
// boolean same = true;
// for (int i = 1; i < board.length && same; i++) {
// if (board[0][0] != board[i][i]) {
// same = false;
// }
// }
// if (same) {
// System.out.println("All " + board[0][0] + "'s on major diagonal");
// isSameOnADiagonal = true;
// }
//
// // Check subdiagonal
// same = true;
// for (int i = 1; i < board.length && same; i++) {
// if (board[0][board.length - 1] != board[i][board.length - 1 - i]) {
// same = false;
// }
// }
// if (same) {
// System.out.println("All " + board[0][board.length - 1] + "'s on sub-diagonal");
// isSameOnASubdiagonal = true;
// }
//
// if (!isSameOnARow)
// System.out.println("No same numbers on a row");
//
// if (!isSameOnAColumn)
// System.out.println("No same numbers on a column");
//
// if (!isSameOnADiagonal)
// System.out.println("No same numbers on the major diagonal");
//
// if (!isSameOnASubdiagonal)
// System.out.println("No same numbers on the sub-diagonal");
// }
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