给某个数组元素赋值

Question

I need help with this little piece of code which I did not quite understand while reading a book about Java programming. Basically there are some pieces of code which is written for you to correct. I managed to correct some of the training exercises, but this one has made me confused..

"The following code segment should assign the value 10 to the array element that corresponds to the third row and the fourth column."

int[] a[] = new int[10][5];

a[2][3] = 10;

So this is the code which is written in the book. How is it supposed to look if I actually correct it? Quite confused of what they actually mean, so if someone could explain I what they mean, I would really appreciate it..

Answer 1

Basically there's a typo with the first line, assignment should be:

int[][] a = new int[10][5];
a[3][2]  = 10;

Answer 2

Your code is incorrect, it should be:

int[][] a = new int[10][5];
a[3][2]  = 10;

Answer 3

if that is the full question, then it is incomplete. A 2d array can either be row-major or column-major . Without know which it is, then you cannot answer that question. That is the correct code for a row-major implementation while for column-major you have to flip the indexes.

a[3][2] = 10;