how to get user input in 2D char array-java

Question

i am trying to take input from the using in a 2d char array where the output should be like :

110

1_0

11_

_11

0__

this can have as many combinations as 2^n where n is also user input. how can i create this output?

public static void main (String args[])

{ Scanner sc = new Scanner(System.in); 
  System.out.println("Enter Value i:  ");
      int i = sc.nextInt();
  int j =(int) Math.pow(2,i);
  char[][]array = new char[i][j];
      for (int k=0;k<i;k++)
    for (int s=0;s<j;s++)
    { array[k][s]= ?;  //i am stuck here

        }

You say that you going to get the input. Why should we care about the output? You do not need a scanner for such simple thing. How reading data for 2d array is different from reading data for 1-d array? — Val
– Val, Commented Nov 17, 2013 at 20:59
i need that output for my other piece of code for that i need the track of rows and columns. — user3002509
– user3002509, Commented Nov 17, 2013 at 21:06

Gaurav · Accepted Answer · 2019-10-10 08:08:30Z

1

Scanner scan=new Scanner(System.in);

char inputArray[][] = new char[rows][cols];

for (int i = 0; i < rows; i++)
{ 
    for (int j = 0; j < cols; j++)
    { 
        inputArray[i][j] = scan.next().charAt(0);
    } 
}

edited Oct 10, 2019 at 8:08

Gaurav

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answered Sep 23, 2017 at 17:32

Gaurav

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1 Comment

Romain Francois Over a year ago

This would be more useful with some text around the code, and better indentation

lio · Accepted Answer · 2020-04-17 21:18:16Z

0

Scanner in = new Scanner(System.in);
int rows = scan.nextInt();
int cols = scan.nextInt();

char arr[][] = new char[rows][cols]; // 2D char array
        for (int i = 0; i < rows; i++) {
            String data = "";
            if (in.hasNext()) { // input from user 
                data = in.next();
            } else {
                break;
            }
            for (int j = 0; j < cols; j++)
                arr[i][j] = data.charAt(j); 
        }
// to get a 2D char array
System.out.println(Arrays.deepToString(arr));

The input will be of the form -

4 // no. of rows
5 // no. of columns
10100
10111
11111
10010

to get a 2D char array as-

[[1, 0, 1, 0, 0], [1, 0, 1, 1, 1], [1, 1, 1, 1, 1], [1, 0, 0, 1, 0]]

edited Apr 17, 2020 at 21:18

lio

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answered Feb 7, 2017 at 0:52

manasiy

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