c++ dynamic memory allocation using “new”

Question

I\'m new to C++, trying to learn by myself (I\'ve got Java background).

There\'s this concept of dynamic memory allocation that I can assign to an array (for example

Answer 1

if you wanna use an array and you dont know the exact size at the compile time, thats when dynamic memory allocation steps in. See the example below,

int a[3] = {1,2,3};  //<= valid in terms of syntax;

however,

int size = 3;
int a[size] = {1,2,3} //<= compile error

in order to fix this,

int* ArrayPtr = new int[size];

also, when freeing it, call delete[] ArrayPtr; instead of delete alone, coz we are talking abt freeing a BLOCK of memory at this moment.