我的任务是在MagicSquare上，我有一些小错误，我相信我无法弄明白。它是一个3x3 magicsquare，随机数为1-9。
请不要更改我们需要使用的方法。
到目前为止我注意到了：
在第76行，我调用方法magicSquare.magicSquare();，因为它要重置，但是当我运行程序时它最终会崩溃。我相信还有更多错误。任何帮助将不胜感激。
//Scanner part two
Scanner input = new Scanner(System.in);
//declare needed variables here
String userIn = "";
//this is the start menu
while(!userIn.equals("start")) {
System.out.println("Enter 'start' to begin the game.");
userIn = input.next().toLowerCase();
if (userIn.equals("start")) {
magicSquare.magicSquare();//ultimately starts the magic square method
}
}
}
//method
public static void magicSquare() {
//initializes the magic square matrix array
int [][] square = new int[3][3];
square = resetMatrix(square);//this uses the resetMatrix method to set matrix to all 0
square = fillMatrix(square);//this uses the fillMatrix method to set the matrix to unique numbers 1-9
magicSquare.displayMagicSquare(square); //this prints the matrix for user to see
System.out.println("Rows sum: " +sumRows(square)); //this displays rows sum
System.out.println("Columns sum: " +sumColumns(square)); //this displays columns sum
System.out.println("Diagonals sum: " +sumDiagonals(square)); //this displays diagonl sums
//decides if square is magic using isMagicSquare method
if (isMagicSquare(square) == true) {
System.out.println("Matrix is a Magic Square!");
}
else if (isMagicSquare(square) == false) {
System.out.println("Matrix is not a Magic Square. \n");
resetMatrix(square);// this resets matrix and restarts to find a magic square
magicSquare.magicSquare();
}
}
//this method to fill matrix with numbers
public static int[][] fillMatrix(int [][] array) {
//this loops through each element and uses isUnique method to set random and unique values.
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
int num = 0;
while (isUnique(array, num) == false) {
num = (int)(9.0 * Math.random()) + 1;
}
array[i][j] = num;
}
}
return array;
}
//this used to reset the matrix by setting each array element to 0
public static int[][] resetMatrix(int [][] array) {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
array[i][j] = 0; //this loops through each element in the array and sets them to 0
}
}
return array;
}
public static void displayMagicSquare(int[][] array) {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
System.out.print(array[i][j] +" ");//Prints each row for the array
}
System.out.println(" ");// this goes to next row (blank)
}
}
/*
* LOOK HERE
* EDIT: SumRows () and SumColumns is wrong
*/
//this is used to calculate the sums of the rows
public static int sumRows(int [][]array) {// sum of rows and sum of columns is wrong
int sum = 0;
int r1=0,r2=0,r3=0;
for (int i = 0; i < 3; i++) {
for (int j =0; j< 3; j++) {
sum += array[i][j];
}
if (i==0)
r1=sum;//assigns 1st row sum to r1
if (i==1)
r2=sum;//assigns 2nd row sum to r2
if (i==2)
r3=sum;//assigns 3rd row sum to r3
}
if (r1==r2&&r2==r3) {//if all rows are equal
return r1;//return the number (it should be 15)
}
else {
return -1;//returns -1 if row sums are not equal
}
}
/*
* Fix me
*/
//this is initially used to calculate the sums of the columns
public static int sumColumns(int [][]array) {
int sum = 0;
for (int j = 0; j < 3; j++) {
for (int i = 0; i < 3; i++) {
sum += array[i][j];
}
}
if (sum/3 !=15) {
return -1;
}
else {
return sum/3;
}
}
//this is initially used to calculate the sums of the diagonals
public static int sumDiagonals(int [][] array) {
int diagSum1 = array[0][0] + array[1][1] + array[2][2];
int diagSum2 = array[0][2] + array[1][1] + array[2][0];
if ((diagSum1 == 15) && (diagSum2 == 15)) {
return 15;
}
else {
return -1;
}
}
//This boolean method goes through the matrix and checks if the value is unique.
public static boolean isUnique(int [][] array, int num) {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
if (array[i][j] == num) {
//Check whether IF an element is equal to the number assigned it
//IT returns false requiring the variable to be changed!
return false;
}
}
}
return true;
}
public static boolean isMagicSquare(int [][] array) {
//as a result, this fundamentally checks if the matrix/array is a MagicSquare
if ((+sumRows(array) == 15) && (+sumColumns(array) == 15) && (+sumDiagonals(array) == 15)) {
return true;
}
else {
return false;
}
}
}
答案 0 :(得分：0)
<强>更新
除了发生递归之外，我几乎修复了所有内容。
就在这一部分：
if (isMagicSquare(square) == true) {
System.out.println("Matrix is a Magic Square!");
}
else if (isMagicSquare(square) == false) {
System.out.println("Matrix is not a Magic Square. \n");
resetMatrix(square); // this resets matrix and restarts to find a magic square
magicSquare.magicSquare();
}
magicSquare.magicSquare();导致相同错误的有限行，但程序运行正常？帮助