Copy numbers from int array to int pointer array

#include <iostream>

int main() {
    int numeros[3] = {5,10,15};
    int *pointnum = new int[10];

    for(int n=0; n!=10; n++)
        pointnum[n] = (n<sizeof(numeros)/4) ? (numeros[n]) : (0);

    for(int d=0; d!=10; d++)
        std::cout << pointnum[d] << std::endl;
}