dynamic array

Question

at this code
https://www.sololearn.com/learning/1089/2950/6400/1

why all elemnts but the first one are zero ?
while they all are in for loop ?

what is the use of size and cap ?

why in initialize cap =1 and zero = 0?

Answer 1

"size" is the current size (length) of the array. "cap" is the current maximum capacity of the array.