How to create an array when the size is a variable not a constant?

Question

I\'ve got a method that receives a variable int. That variable constitutes an array size (please, don\'t offer me a vector). Thus, I need to init a const int inside my metho

Answer 1

To do what you want, you will need to use dynamic allocation. In which case I would seriously suggest using vector instead - it is the "right" thing to do in C++.

But if you still don't want to use vector [why you wouldn't is beyond me], the correct code is:

 void foo(int variable_int){
    int *a   = new int[variable_int]();   // Parenthesis to initialize to zero.
    ... do stuff with a ... 
    delete [] a;
 }

As others have suggest, you can also use calloc, which has the same effect of initializing to zero, but not really the "c++" solution.