Multidimensional arrays from standard input

user_15443890 0
Viewed 50

I'm trying to figure out how to read in a multidimensional array from standard input given the user provides the row and col size followed by integers of the array

e.g. Input:

        2 3      <= row, col of array
        8 3 10   < array integers
        7 9 6

My code is currently:

    int colA = scan.nextInt();
    int rowA = scan.nextInt();        

    int[][] array = new int[rowA][colA];

    for (int i = 0; i <rowA;i++){
        for (int j=0; j<colA;j++){
            array1[i][j] += scan.nextInt();
        } 
    }

And the output of my array is: [[8,3,10,7,9,6]] but what I'd like to do is output [[8,3,10],[7,9,6]]

multidimensional-array user-input for-loop arrays java
2 Answers

Here first the row and col value got from users is reversed that is the only mistake i could see import java.util.Arrays; import java.util.Scanner;

public class TwoDimensionalArray {

public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    int rowA = scan.nextInt();
    int colA = scan.nextInt();

    int[][] array = new int[rowA][colA];

    for (int i = 0; i < rowA; i++) {
        for (int j = 0; j < colA; j++) {
            array[i][j] += scan.nextInt();
        }
    }
    for (int[] innerArray : array) {
        System.out.println(Arrays.toString(innerArray));
    }
}

} This is a working one

user_50889630

There are some errors in your code.

  1. You inverted the order of the dimensions asked to the users.

    Use this:

    int rowA = scan.nextInt();
int colA = scan.nextInt();

    Instead of this:

    int colA = scan.nextInt();        
int rowA = scan.nextInt();

  2. You wrote array1 instead of array in array1[i][j] += scan.nextInt();

Note that you can use array[i][j] = scan.nextInt(); instead of array[i][j] += scan.nextInt()

user_183366540
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