Multidimensional Arrays

Question

Multidimensional Arrays

int[ ][ ] myArr = { {1, 2, 3}, {4}, {5, 6, 7} };
myArr[0][2] = 42;
int x = myArr[1][0]; // 4

I don't understand this line : myArr[0][2] = 42;
and why output 4 ?

Answer 1

imagine it in this format:
(the numbers without | | around them are indexes)

0 1 2
0 |1|2|3|
1 |4|
2 |5|6|7|

so myArr[0][2]=42 basically accesses and changes the value inside row 2, column 0, from 3 to 42

so after that assignment the array will look like this:

0 1 2
0 |1|2|42|
1 |4|
2 |5|6|7|

and int x = myArr[1][0] will assign the value that is inside row 1, column 0 into the x variable.

Answer 2

@Burey thank you so much!!