Ok, the title might be deceiving. All i want to do is take my Bingo program and when the second bingo card is printed, i want to replace all the "0"'s with "X"'s. I was thinking i would have to go and change the array to an string, but i'm not surer where to start.
Here is the Bingo program:
import java.util.*;
import java.io.*;
import java.util.Arrays;
public class Bingo
{
public static final int ROWS = 5;
public static final int COLS = 5;
public static final int VERTICAL = 1;
public static final int DIAGONAL = 2;
public static final int HORIZONTAL = 3;
public static int winFound;
public static int currPick = 0;
public static int randomPick = 0;
public static int WinFound;
public static void main(String[] args)
{
int Totcards;
int[][] card = new int[ROWS][COLS];
int[] picks = new int[25];
fillCard (card);
printCard(card);
playGame(card);
printCard(card);
finalCard(card);
}
private static void fillCard (int[][] card)
{
// FileReader fileIn = new FileReader("Bingo.in");
// Bufferreader in = new Bufferreader(fileIn);
try {
Scanner scan = new Scanner(new File("bingo.in"));
for (int i=0; i<card.length; i++){
for (int j=0; j<card[0].length; j++){
card[i][j] = scan.nextInt();
}
}
} catch(FileNotFoundException fnfe) {
System.out.println(fnfe.getMessage());
}
}
private static void printCard (int[][] card)
{
System.out.println("\n\tYOUR BINGO CARD : ");
System.out.println("\n\tB I N G O");
System.out.println("\t----------------------");
for (int i=0; i<card.length; i++){
for (int j=0; j<card[0].length; j++){
System.out.print("\t" + card[i][j]);
}
System.out.print("\n");
}
}
private static void playGame (int[][] card)
{
int numPicks = 0;
System.out.println("\n\tBINGO NUMBERS PICKED AT RANDOM FROM BIN: ");
while (true)
{
markCard (card); // Generate a random num & zero-it out
winFound = checkForWin(card); // Look for zero sums
numPicks++;
if (winFound != 0)
{
if (winFound == 1)
{
System.out.print("\n\n\tYOU WIN WITH A VERTICAL WIN AFTER " + numPicks + " PICKS\n");
}
else if (winFound == 2){
System.out.print("\n\n\tYOU WIN WITH A DIAGONAL WIN AFTER " + numPicks + " PICKS\n");
}
else if (winFound == 3){
System.out.print("\n\n\tYOU WIN WITH A HORIZONTAL WIN AFTER " + numPicks + " PICKS\n");
}
announceWin (numPicks);
return;
}
}
}
private static void markCard (int[][] card)
{
int randomPick = (int) (Math.random() * 74) + 1;
for (int j = 0; j < ROWS; j++){
for (int k = 0; k < COLS; k++){
if (card[j][k]==randomPick)
card[j][k] = 0;}
}
System.out.print("\t " + randomPick + " ");
System.out.print("");
}
private static int checkForWin(int[][] card)
{
int sum=0;
for (int i = 0; i < ROWS; i++)
{
sum = 0;
for (int j = 0; j < COLS; j++)
sum += card[i][j];
if (sum == 0)
return HORIZONTAL;
}
for (int j = 0; j < COLS; j++)
{
sum = 0;
for (int i = 0; i < ROWS; i++)
sum += card[i][j];
if (sum == 0)
return VERTICAL;
}
sum = 0;
for (int i = 0; i < ROWS; i++)
sum += card[i][ROWS-i-1];
if (sum == 0)
return DIAGONAL;
sum = 0;
for (int i = 0; i < ROWS; i++)
sum += card[i][i];
if (sum == 0)
return DIAGONAL;
return WinFound;
}
private static void makeCard(int[][] card, int[] picks)
{
int count = 100;
int currPick = 0;
for (int i=0; i<count; i++){
currPick = (int)(Math.random() * 74) + 1;
System.out.print(" " + currPick + "\n");
picks[i] = currPick;
}
}
private static void announceWin(int numPicks)
{
}
private static boolean duplicate (int currPick, int[] picks, int numPicks)
{
for (int i = 0; i < numPicks; i++){
if (picks[i] == currPick){
return true;}
}
return false;
}
private static void finalCard (int[][] card)
{
Arrays.sort(card);
final String stringRep = Arrays.toString(card);
final String[] out =
stringRep.substring(1, stringRep.length() - 1).split("\\s*,\\s*");
System.out.println(Arrays.toString(out));
}
}
Try this:
System.out.print("\t" + (card[i][j] == 0 ? "X" : card[i][j]))
Why don't you just use a String[][] for the fields from the beginning? You can still compare String values with ints (with Integer.valueOf for instance) and this way you don't have to switch types runtime...
Related
The program below ask the user how many mines he wants to see on the field and then display the field with mines.
In next step I need to calculate how many mines are around each empty cell. And I know that I
need to check 8 cells if the cell is in the middle, 5 cells if the cell is in the side, and 3
cells if the cell is in the corner. If there are from 1 to 8 mines around the cell, I need to
output the number of mines instead of the symbol representing an empty cell.
import java.util.Scanner;
import java.util.Random;
public class Minesweeper {
char[][] minesweeper = new char[9][9];
Random randNum = new Random();
Scanner sc = new Scanner(System.in);
public Minesweeper() {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
minesweeper[i][j] = '*';
}
}
}
public void printMinesweeper() {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
System.out.print(minesweeper[i][j]);
}
System.out.println();
}
}
public void randomX() {
System.out.print("How many mines do you want on the field?: ");
int numberOfMines = sc.nextInt();
int i = 0;
while (i < numberOfMines) {
int x = randNum.nextInt(9);
int y = randNum.nextInt(9);
if (minesweeper[x][y] == '*') {
minesweeper[x][y] = 'X';
i++;
}
}
printMinesweeper();
}
}
You can do it like this:
import java.util.Random;
import java.util.Scanner;
public class Minesweeper {
public static void main(String[] args) {
Minesweeper minesweeper = new Minesweeper();
minesweeper.randomX();
minesweeper.printMinesweeper();
}
char[][] minesweeper = new char[9][9];
Random randNum = new Random();
Scanner sc = new Scanner(System.in);
public Minesweeper() {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
minesweeper[i][j] = '*';
}
}
}
public void printMinesweeper() {
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
System.out.print(getCharAt(i, j));
}
System.out.println();
}
}
private String getCharAt(int i, int j) {
if (mineAt(i, j)) {
return "X";
}
int minesNear = countMinesNear(i, j);
return Integer.toString(minesNear);
}
private boolean mineAt(int i, int j) {
return minesweeper[i][j] == 'X';
}
private int countMinesNear(int i, int j) {
int mines = 0;
for (int x = -1; x <= 1; x++) {//near fields in x direction
for (int y = -1; y <= 1; y++) {//near fields in y direction
if (x + i >= 0 && x + i < minesweeper.length && y + j >= 0 && y + j < minesweeper.length) {//check whether the field exists
if (minesweeper[x+i][y+j] == 'X') {//check whether the field is a mine
mines++;
}
}
}
}
return mines;
}
public void randomX() {
System.out.print("How many mines do you want on the field?: ");
int numberOfMines = sc.nextInt();
int i = 0;
while (i < numberOfMines) {
int x = randNum.nextInt(9);
int y = randNum.nextInt(9);
if (minesweeper[x][y] == '*') {
minesweeper[x][y] = 'X';
i++;
}
}
printMinesweeper();
}
}
The countMinesNear(int, int) method check whether the field near exists (to prevent index errors on the edges) and counts the mines if the fields exist.
My goal is to print out a user input value (and its corresponding index) if it appears 1 or more times in a random generated array of 50 integers. If I search the array for a value, and it happens to appear more than once, however, only one location of the element is printed, and then the if-else statement is executed. If I remove the break at the end of the third for loop, the whole thing falls apart. I've attached an image but here is the part of it that is giving me an issue. Apologies if the code is not clean, I'm very new.
public static void main(String[] args) {
System.out.println("IDS201 HW3:\n");
System.out.println("1. Generate 50 random integer unsorted list.\n");
Scanner stdin = new Scanner(System.in);
int[] randomNumbers = new int[50];
for(int index = 0; index < randomNumbers.length; index++) {
randomNumbers[index] = (int) (Math.random()*100);
}//end for
int count = 0;
for(int i = 0; i < randomNumbers.length; i++) {
System.out.print(randomNumbers[i] + ",");
count++;
if(count == 10) {
System.out.println();
count = 0;
}
}//end for
System.out.println("\nSearch value?");
int x = stdin.nextInt();
int i;
for(i = 0; i < randomNumbers.length; i++) {
if(randomNumbers[i] == x)
break;}
if (i != randomNumbers.length) {
System.out.println("\nFound " + x + " in array [" + i + "]");}
else {
System.out.println(x + " is not in the list");}
{int temp;
int size = randomNumbers.length;
for(i = 0; i<size; i++ ){
for(int j = i+1; j<size; j++){
if(randomNumbers[i]>randomNumbers[j]){
temp = randomNumbers[i];
randomNumbers[i] = randomNumbers[j];
randomNumbers[j] = temp;
}
}
}
System.out.println("\nSmallest element of the array is: " + randomNumbers[0]);}
System.out.println("\n3. Sort the list:");
int size = randomNumbers.length;
for(i=0; i<size; i++)
{
for(int j=i+1; j<size; j++)
{
if(randomNumbers[i] > randomNumbers[j])
{
int temp = randomNumbers[i];
randomNumbers[i] = randomNumbers[j];
randomNumbers[j] = temp;
}
}
}
System.out.print("Now the Array after Sorting is :\n\n");
int count1 = 0;
for(i=0; i<size; i++)
{
System.out.print(randomNumbers[i]+ ",");
count++;
if(count == 10) {
System.out.println();
count = 0;
}
}
}
}
if statement in for loop
Implementing the comments to your question:
import java.util.Scanner;
public class NumCount {
private static final int RANDOM_NUMBER_COUNT = 50;
private static void display(int[] randomNumbers) {
int count = 0;
for (int i = 0; i < RANDOM_NUMBER_COUNT; i++) {
System.out.print(randomNumbers[i] + ",");
count++;
if (count == 10) {
System.out.println();
count = 0;
}
}
}
private static int[] generateRandomNUmbers() {
int[] randomNumbers = new int[RANDOM_NUMBER_COUNT];
for (int index = 0; index < RANDOM_NUMBER_COUNT; index++) {
randomNumbers[index] = (int) (Math.random() * 100);
}
display(randomNumbers);
return randomNumbers;
}
private static int search(int[] randomNumbers, int x) {
int i;
int count = 0;
for (i = 0; i < randomNumbers.length; i++) {
if (randomNumbers[i] == x) {
System.out.println("\nFound " + x + " in array [" + i + "]");
count++;
}
}
return count;
}
private static int[] sort(int[] randomNumbers) {
int size = randomNumbers.length;
for (int i = 0; i < size; i++) {
for (int j = i + 1; j < size; j++) {
if (randomNumbers[i] > randomNumbers[j]) {
int temp = randomNumbers[i];
randomNumbers[i] = randomNumbers[j];
randomNumbers[j] = temp;
}
}
}
return randomNumbers;
}
/**
* Start here.
*/
public static void main(String[] args) {
System.out.println("IDS201 HW3:\n");
System.out.println("1. Generate " + RANDOM_NUMBER_COUNT + " random integer unsorted list.\n");
int[] randomNumbers = generateRandomNUmbers();
System.out.print("\n2. Search value? ");
Scanner stdin = new Scanner(System.in);
int x = stdin.nextInt();
int count = search(randomNumbers, x);
if (count == 0) {
System.out.println(x + " is not in the list");
}
System.out.println("\n3. Sort the list:");
sort(randomNumbers);
System.out.print("Now the Array after Sorting is :\n\n");
display(randomNumbers);
}
}
Of-course there is no need to search for the smallest number because it will be the first element in the sorted array. Hence I removed that part of your code.
The problem is when you entry an input with scanner ,it shows on console. I want them to shown in an order. I want them shown like a matris. But with nextInt method all shows bottom of each other.
I want a console output like this:
But with nextInt() method your new int shows on nextLine like this:
How can i show multiple variables in same line with scanner?
import java.util.Scanner;
public class ProbilityMatrixTest {
static int M;
static int N;
static float[][] matrixX;
static float[][] matrixY;
static boolean isProbilityMatrix;
public static void main(String[] args) {
initiate();
testMatrix(matrixX);
System.out.println();
multiplyMatrix();
testMatrix(matrixY);
}
public static void initiate() {
Scanner sc = new Scanner(System.in);
System.out.print("Enter the row and column size of matrix : ");
M = sc.nextInt();
N = sc.nextInt();
System.out.println();
matrixX = new float[M][N];
System.out.println("Enter values of " + M + "x" + N + " matrix :");
for (int j = 0; j < N; j++) {
for (int i = 0; i < M; i++) {
matrixX[i][j] = sc.nextFloat();
}
}
}
public static void testMatrix(float[][] givenMatrix) {
isProbilityMatrix = true;
if (M != N) {
isProbilityMatrix = false;
}
for (int j = 0; j < N; j++) {
float rowVariablesTotal = 0;
for (int i = 0; i < M; i++) {
rowVariablesTotal += givenMatrix[i][j];
if (givenMatrix[i][j] < 0) {
isProbilityMatrix = false;
}
}
if (rowVariablesTotal != 1.0f) {
isProbilityMatrix = false;
}
}
System.out.print("TEST RESULT : ");
if (isProbilityMatrix) {
System.out.println("Probility matrix");
} else {
System.out.println("not Probility matrix");
}
}
public static void multiplyMatrix() {
matrixY = new float[M][N];
for (int i = 0; i < M; i++) {
for (int j = 0; j < N; j++) {
float newMatrixVariable = 0;
for (int a = 0; a < M; a++) {
newMatrixVariable += (matrixX[i][a] * matrixX[a][j]);
}
matrixY[i][j] = newMatrixVariable;
}
}
System.out.println("The square of given matrix:");
for (int j = 0; j < M; j++) {
for (int i = 0; i < N; i++) {
System.out.print(matrixY[i][j] + " ");
}
System.out.println();
}
}
}
You need to scan entire lines at a time. Otherwise, you're always pressing the enter key, causing it to look like you're entering one value before the other on previous lines
For example, type 3 3, then enter, then you can type three space separated decimal values, enter, then repeat that twice
System.out.print("Enter the row and column size of matrix : ");
String[] mn = sc.nextLine().split("\\s+");
int M = Integer.parseInt(mn[0]);
int N = Integer.parseInt(mn[1]);
System.out.println();
double[][] matrixX = new double[N][];
for (int i = 0; i < N; i++) {
matrixX[i] = new double[M];
String[] row = sc.nextLine().split("\\s+");
for (int j = 0: j < M: j++) {
matrix[i][j] = Double.parseDouble(row[j]);
//...
}
}
I've created a 2 dimensional array with the same length and it is randomly filled with 1 and 0 for example.
0100
0010
1110
1111
How do I code the program to find the rows,columns and diagonals with all 1s and 0s
This is my code so far:
public class Test2dArray {
public static void main(String[] args) {
int row,column;
System.out.print("Enter the lenghth of matrix:");
Scanner input = new Scanner(System.in);
Random rand = new Random ();
int mSize = input.nextInt();
int [][] mArray = new int [mSize][mSize];
for (row=0; row < mSize; row++){
for(column=0; column < mSize; column++){
mArray[row][column]=rand.nextInt(2);
System.out.print(mArray[row][column]+ " ");
}
System.out.println();
}
}
}
Code isn't perfect (I'm sure it can be optimized) but it works
public static void main (String[] args) throws java.lang.Exception {
int row = 5;
int column = 5;
int [][] mArray = fillArray(row, column);
System.out.println("Rows: " + findRows(mArray));
System.out.println("Columns: " + findColumns(mArray));
System.out.println("Diags: " + findDiags(mArray));
}
private static ArrayList<Integer> findRows(int [][] mArray) {
ArrayList<Integer> result = new ArrayList<Integer>();
for (int i = 0; i < mArray.length; i++){
boolean isRow = true;
for(int j = 0; j < mArray[0].length; j++){
if (j > 0 && mArray[i][j] != mArray[i][j - 1]) {
isRow = false;
break;
}
}
if (isRow) result.add(i);
}
return result;
}
private static ArrayList<Integer> findColumns(int [][] mArray) {
ArrayList<Integer> result = new ArrayList<Integer>();
for (int j = 0; j < mArray[0].length; j++){
boolean isColumn = true;
for(int i = 0; i < mArray.length; i++){
if (i > 0 && mArray[i][j] != mArray[i - 1][j]) {
isColumn = false;
break;
}
}
if (isColumn) result.add(j);
}
return result;
}
private static ArrayList<Integer> findDiags(int [][] mArray) {
ArrayList<Integer> result = new ArrayList<Integer>();
for (int i = 1; i < mArray.length; i++) {
boolean isDiag = true;
for (int j = 0; j < i; j++) {
if (mArray[i - j][j] != mArray[i - j - 1][j + 1]) {
isDiag = false;
break;
}
}
if (isDiag) result.add(i);
}
for (int i = 0; i < mArray.length - 2; i++) {
boolean isDiag = true;
for (int j = i + 1; j < mArray.length - 1; j++) {
if (mArray[mArray.length - j + i][j] != mArray[mArray.length - j + i - 1][j + 1]) {
isDiag = false;
break;
}
}
if (isDiag) result.add(mArray.length + i);
}
return result;
}
private static int[][] fillArray(int row, int column) {
int [][] mArray = new int [row][column];
Random rand = new Random();
for (int i = 0; i < row; i++){
for(int j = 0; j < column; j++){
mArray[i][j] = rand.nextInt(2);
System.out.print(mArray[i][j] + " ");
}
System.out.println();
}
return mArray;
}
Iterate and for each row and columns and sum the values into rowSum and columSum.
So:
if (rowSum == mSize)
System.out.print("The row "+i+"is full of ones");
if (rowSum == 0)
System.out.print("The row "+i+"is full of zeros");
And the same, obviously, for the columns and diagonals.
import java.util.Scanner;
public class Matrix{
private int rowNumber;
private int colNumber;
private int val;
int [][] matrix;
public Matrix(){
rowNumber = 0;
colNumber = 0;
}
public Matrix(int row, int col){
rowNumber = row;
colNumber = col;
Matrix obj = new Matrix();
matrix = new int [rowNumber][colNumber];
Scanner input = new Scanner(System.in);
for (int i = 0; i < rowNumber; i++) {
for (int j = 0; j < colNumber; j++) {
System.out.println("Enter A" + (i+1) +""+ (j+1) + " : ");
matrix [i][j] = input.nextInt();
int val = matrix[i][j];
obj.setElement(rowNumber,colNumber,val);
}
}
obj.display();
}
public void setElement(int r, int c, int value){
matrix = new int [rowNumber][colNumber];
matrix[r][c] = value;
}
public int getElement(int r, int c){
matrix = new int [rowNumber][colNumber];
return matrix[r][c];
}
public void display(){
Matrix ex = new Matrix();
String str = "|\t";
for(int i=0; i<rowNumber; i++){
for(int j=0; j<colNumber ;j++){
**str += ex.getElement(i,j) + "\t";**
}
System.out.println(str + "|");
str = "|\t";
}
}
public static void main (String[] args) {
int rowNumber;
int colNumber;
Scanner input = new Scanner(System.in);
System.out.println("Enter number of rows: ");
rowNumber = input.nextInt();
System.out.println ("Enter number of columns: ");
colNumber = input.nextInt();
Matrix obj1 = new Matrix(rowNumber,colNumber);
}
}
I cannot display the required matrix. having problem in get and set methods. the program input value into an array and that value is stored in a variable. then that variable is passed as argument to the set method the setmethod takes the vaalue and put it in the array with r row and c column, all the values are stored in an array and then the display method is called in the constructor which uses the get method to get the value.
No need to create array again in get and set and display methods.
You are creating lot of objects unnecessarily.I have changed your code to work properly
Please use this code
import java.util.Scanner;
class Matrix {
private int rowNumber;
private int colNumber;
int[][] matrix;
public Matrix() {
rowNumber = 0;
colNumber = 0;
}
public Matrix(int row, int col) {
rowNumber = row;
colNumber = col;
matrix = new int[rowNumber][colNumber];
Scanner input = new Scanner(System.in);
for (int i = 0; i < rowNumber; i++) {
for (int j = 0; j < colNumber; j++) {
System.out.println("Enter A" + (i + 1) + "" + (j + 1) + " : ");
setElement(i, j, input.nextInt());
}
}
display();
}
public void setElement(int r, int c, int value) {
matrix[r][c] = value;
}
public int getElement(int r, int c) {
return matrix[r][c];
}
public void display() {
String str = "|\t";
for (int i = 0; i < rowNumber; i++) {
for (int j = 0; j < colNumber; j++) {
str += getElement(i, j) + "\t";
}
System.out.println(str + "|");
str = "|\t";
}
}
public static void main(String[] args) {
int rowNumber;
int colNumber;
Scanner input = new Scanner(System.in);
System.out.println("Enter number of rows: ");
rowNumber = input.nextInt();
System.out.println("Enter number of columns: ");
colNumber = input.nextInt();
Matrix obj1 = new Matrix(rowNumber, colNumber);
}
}
Your code had several NullPointerExceptions, basically because you were creating new Matrix objects using an empty constructor and then trying to set the matrix' properties from there, which means there was no matrix created inside your empty constructor, thus causing it to point to null.
Try this instead (I also used Prabhaker's answer here):
public Matrix(int row, int col){
rowNumber = row;
colNumber = col;
matrix = new int[rowNumber][colNumber];
Scanner input = new Scanner(System.in);
for (int i = 0; i < rowNumber; i++) {
for (int j = 0; j < colNumber; j++) {
System.out.println("Enter A" + (i + 1) + "" + (j + 1) + " : ");
matrix[i][j] = input.nextInt();
int val = matrix[i][j];
setElement(rowNumber - 1, colNumber - 1, val);
}
}
display();
}
public void setElement(int r, int c, int value) {
matrix[r][c] = value;
}
public int getElement(int r, int c) {
return matrix[r][c];
}
public void display() {
String str = "|\t";
for (int i = 0; i < rowNumber; i++) {
for (int j = 0; j < colNumber; j++) {
str += getElement(i, j) + "\t";
}
System.out.println(str + "|");
str = "|\t";
}
}`