Hello @KEEP,
For you first question, you create an array of 10 slots with only zeros.
Then you say that the value of each slot is taht value times 2 but 0 x 2 is always 0.
For your second question, you have a typo there: while (0 < 10) {
0 is always lower than 10 so this is an infinite loop. It should be n<10.