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javamultidimensional-array
user3038888
user3038888

Reputation: 35

How to set the initial value of a multidimensional array in java

2DI need to use a two-dimensional array of doubles to store grades. The first dimension of the array will represents each student while the second dimension represents the grade for each assignment. The maximum number of assignments for any course is provided when the course is created. I need to make it so that grades that have not been assigned are given an initial value of -1

I know that for single arrays you can do this

double[] grade = new double[10];
for (double i = 0; i < size; i++) {
array[i] = -1;
}

How would I do it for a 2D array?

Upvotes: 2

Views: 5667

Answers (2)

Evgeniy Dorofeev
Evgeniy Dorofeev

Reputation: 136022

try this

    double[][] grade = new double[10][10];
    for (double[] e : grade) {
        Arrays.fill(e, -1);
    }

Upvotes: 6

Paul Samsotha
Paul Samsotha

Reputation: 209004

First all, you can't do this

double[] grade = new int[10];

double[] and int[] are incompatible types.

To declare a 2D array just use two sets of square brackets

double[][] grade = new double[10][10];

This will give you a total of 100 indices, max index being [9][9], and min[0][0].

To iterate through the array you use a nested loop

for (int i = 0; i < grade.length; i++){         // iterates each student
    for (int j = 0; j < grade[i].length; j++){  // iterates each grade
        // do something with grade[i][j]
    }
}

Upvotes: 2

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