Java - How to populate 2d array with nested while loops?

Question

I need to populate a double array with user input by using nested while loops only. This is what I have so far:

public static double[][] score() {
        int col = 3;
        int row = 3;
        int size = 0;
        Scanner in = new Scanner(System.in);
        double[][] scores = new double[row][col];
        System.out.println("Enter your scores: ");
        while (in.hasNextDouble() && size < scores.length) {
            while (size < scores[size].length) {
                scores[][] = in.hasNextDouble();
                size++;
            }
            return scores;
        }

Do you know the size of the array before hand?

luckydog32
– luckydog32

2017-11-17 23:49:09 +00:00
Commented Nov 17, 2017 at 23:49 — luckydog32
– luckydog32, Commented Nov 17, 2017 at 23:49
3 rows, 3 columns so i need 9 total inputs.

user8813072
– user8813072

2017-11-17 23:53:23 +00:00
Commented Nov 17, 2017 at 23:53 — user8813072
– user8813072, Commented Nov 17, 2017 at 23:53

luckydog32 · Accepted Answer · 2017-11-17 23:51:54Z

4

The most common way to do this is through for loops since they allow you to specify the index counters you need in a concise way:

for(int i = 0; i < scores.length; i++){
    for(int j = 0; j < scores[i].length; j++){
        scores[i][j] = in.nextDouble();
    }
}

If you specifically need to use while loops you can do pretty much the same thing, its just broken up into multiple lines:

int i = 0;
while(i < scores.length){
    int j = 0;
    while(j < scores[i].length){
        scores[i][j] = in.nextDouble();
        j++;
    }
    i++;
}

answered Nov 17, 2017 at 23:51

luckydog32

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