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Question

I have to write such a program: 1.two two-dimensional arrays have the same dimensions m × n, 2.satisfy the condition that aij = bij for i = 0,. . . , m and j = 0,. . . , n The method returns the result in the form of a logical value true only when both of the above are met simultaneously. what does it mean "returns the result"? This means that it displays on the screen? I wrote something like that:

static boolean isEqual(int[][] a, int[][] b) {
    int ia = 0;`
    int ib = 0;
    int ja = 0;
    int jb = 0;
    boolean equal=true;
    for (int i = 0; i < a.length; i++) {
        for (int j = 0; j < a[i].length; j++) {

            ia++;
        }
        ja++;
    }

    for (int i = 0; i < b.length; i++) {
        for (int j = 0; j < b[i].length; j++) {

            ib++;
        }
        jb++;
    }
    if (ia == ib && ja == jb) {
        for (int i = 0; i < b.length; i++) {
            for (int j = 0; j < b[i].length; j++) {
                if (a[i][j] != b[i][j]) {
                    equal= false;
                } 
            }
        }

    } else {
        equal= false;
    }
    return equal;


}

}

Answer 1

Your code doesn't need ia , ib , ja , and jb . Since you've been told that both arrays have the same dimensions (m × n), you can simply get those two values using int m = a.length; int n = a[0].length; int m = a.length; int n = a[0].length;

That then simplifies your code to:

static boolean isEqual(int[][] a, int[][] b) {
    int m = a.length;
    int n = a[0].length;
    for (int i = 0; i < m; i++)
        for (int j = 0; j < n; j++)
            if (a[i][j] != b[i][j])
                return false;
    return true;
}