Need help understanding strange array syntax

Question

I found this bit in a book and I don\'t get what it does:

int index = 1;
...
getArray() [index=2]++;

[index=2]++; looks strange to me,

Answer 1

Of course it will be invalid, you're not doing anything with it.

getArray() [index=2]++;

For demonstration i will switch getArray() with myArray which has { 100, 200, 300, 400 }.
Than it's equals to:

myArray[2]++;

myArray[2] will now output: 301
And index will be: 2