Why can't I implicitly convert a double to an int?

Question

You can implicitly convert an int to a double: double x = 5;

You can explicitly convert an int to a double: double x = (double) 5;

You can explicitly convert a double to an int: int x = (int) 5.0;

Why can't you implicitly convert a double to an int?: int x = 5.0;

Answer 1

The range of double is wider than int. That's why you need explicit cast. Because of the same reason you can't implicitly cast from long to int:

long l = 234;
int x = l; // error