Segmentation fault (core dumped) when accessing memory that has been allocated via new()

When trying to check for a value that has been initialized via new(), I can a segmentation fault error.

int main() {
  const char* const *matrix = new(char*);
  std::cout << matrix[0][0]; // segfault here
  return 0;
}

My suggestion is that there should be garbage value, but no segfault.

>Solution :

You allocate new(char*) and assign in to matrix, which makes matrix[0] to not be a segfault because matrix is a valid pointer.

However, matrix[0] is not a valid pointer. It contains a garbage data, so matrix[0][0] tries to get a random memory location, which ends in a segfault.