I think I'm misunderstanding this line of code in C++?

Question

What does this line do?

int* addr = new int[num];

It is making an array with a pointer? Or something? I've been studying for a final and doing my last programs in a class all day and the code is starting to blend together...

Answer 1

addr is a pointer to an array of num ints

This lets your program dynamically allocate the memory for the array, instead of having a fixed amount of memory by defining int a[1000], for example. You can't say int a[num]; it's not valid.

You use this when you'll be determining the size of the array programmically. It's then also common to see delete a[ ] later on to free the memory.

Check out this site:
http://www.fredosaurus.com/notes-cpp/newdelete/50dynamalloc.html

Answer 2

It creates a new array of num integers, and sets addr to the address if the first element of the array.