How to add element to C++ array?

Question

I want to add an int into an array, but the problem is that I don\'t know what the index is now.

int[] arr = new int[15];
arr[0] = 1;
arr[1] = 2;
arr[2] = 3;         


        

Answer 1

Use a vector:

#include 

void foo() {
    std::vector  v;
    v.push_back( 1 );       // equivalent to v[0] = 1
}