Multidimensional arrays, two dimensional makes sense, but not much else.

Question

Straight from solo learn's tutorial. Not sure how they work. I was able to do the first half of it.
int[ ][ ] myArr = { {1, 2, 3}, {4}, {5, 6, 7} };
myArr[0][2] = 42;
int x = myArr[1][0]; // 4
explain how this works, please!

Answer 1

Brian Rowley two dimensional arrays are nothing but matrices which has rows and columns.

The matrix will look something like this-

1 2 3
4
5 6 7

myArr[0][2] is the element at 0th row and 2nd column which is 3. This will be replaced by 42.

myArr[1][0] is the element at 1st row and 0th column which is nothing but 4.

Remember just like array index are numbered from 0 to n-1 similarly the row and column are considered from 0. So your 1st row is 0th row and your 1st column is 0th column.