c++ initial value of dynamic array

Question

I need to dynamically create an array of integer. I've found that when using a static array the syntax

int a [5]={0}; 

initializes correctly the value of all elements to 0.

Is there a way to do something similar when creating a dynamic array like

int* a = new int[size]; 

without having to loop over all elements of the a array? or maybe assigning the value with a for loop is still the optimal way to go? Thanks

Answer 1

Sure, just use () for value-initialization:

 int* ptr = new int[size](); 

(taken from this answer to my earlier closely related question)

Answer 2

I'd do:

int* a = new int[size]; memset(a, 0, size*sizeof(int));