值范围是否取决于数据类型的大小? [英] Is Range of value depends upon Size of datatype?

问题描述

float 的大小为 4 个字节，long 的大小为 8 个字节.
因此，float 的大小小于 long 的大小.但是，浮动范围大于长.

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.

十进制和双精度相同.

数据类型

  +----------+------------+----------------------+
  | 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 |
  +----------+------------+----------------------+

示例:

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

所以，double 比decimal 可以容纳更大的值并且占用更少的大小.为什么?

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

推荐答案

因为 double 用于指数的位比十进制多.

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

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