Can we add a single number to an array that is allocated on heap memory ?

Question

Today I started a C++ challenge with someone, and one of the five questions was a bit strange to me :

int *data = new int [ 8 ];
for ( int i = 0; i < 8; i++ )
data [ i ] += i + 2;
data += 2;

What does the last line do ?? I mean data += 2. At first I wanted to google it, but I had no idea what I should search for :( please help me out.

Answer 1

Initially data points to first location of the array that data[0] which is same as *data; (which returns 2)

data += 2 causes the initial pointer advances to 2 pointer location so now data points to the 3rd element( 2nd index location), and now it is data[0] or *data ( now which returns 4)

It is by pointer arithmetic. You can search by "Arrays and pointers arithmetic"