Question

float have size of 4 bytes and long have size of 8 bytes.
So, size of float is smaller than size of long. but, range of float is greater than long.

Same case for decimal and double.

Data Types

  +----------+------------+----------------------+
  | Data Type|   Size     |        Range         |
  +----------+------------+----------------------+
  |  long    | 8 bytes    |-9.22e18 .. 9.22e18   |
  |  float   | 4 bytes    |-3.40e38 .. 3.40e38   |
  |  decimal | 16 bytes   |-7.92e28 .. 7.92e28   |
  |  double  | 8 bytes    |-1.80e308 .. 1.80e308 |
  +----------+------------+----------------------+

Example:

        decimal f = 10000000000000000000.0m;            //takes 16 bytes
        double d = 10000000000000000000000000000.0d;   //takes 8 bytes

So, double can hold greater value and takes less size than decimal.Why?

Answer 1

Because double has devoted more bits to the exponent than the decimal has.