//find the final element
int index;
for (int i = myArray.size() - 1; i > -1; i--) {
  if (myArray[i] != 0) {
    index = i+1;
    break; }
}

//print out to that element
for (int i = 0; i <= index; i++) {
  std::cout << myArray[i] << "\t";
}