Why is it a double and not an integer?

Question

I know this may sound very stupid, (it's my first day)
But is y a double instead of an integer, is it just because it is literally double than 10, the previous value? (Im not sure if i make sense)

Here is the code copy-pasted from the lesson here.

static void Main(string[] args)
{
int x = 10;
double y = 20; // is it right or wrong to be a int instead of a double? Im very curious //

Console.WriteLine("x = {0}; y = {1}", x, y);
}
// Output: x = 10; y = 20

Answer 1

It has nothing to do with the fact that y is the double of x.

Doubles are 15 digits long decimals, they're the double of a floating point (float) which are 7 digits long decimal numbers. However, you may still store integers in a floating point variable.

Answering your question. It is a double just to a different datatype.