基本数据类型

• 整形数据：

C#定义的整形数据

是能一一对应上的。

• 浮点类型：
  | | |
  | ------------ | ------------ |
  | real | |
  | | |

float [ (n) ] Where n is the number of bits that are used to store the mantissa of the float number in scientific notation and, therefore, dictates the precision and storage size. If n is specified, it must be a value between 1 and 53. The default value of n is 53.

mantissa n.对数
notation n.符号

可以发现与C#中的浮点类一样。因为两者都是符合ISO规范的。

• 精确计数
  decimal[(p[,s])]
  numeric[(p[,s])]

p (precision)
The maximum total number of decimal digits to be stored. This number includes both the left and the right sides of the decimal point. The precision must be a value from 1 through the maximum precision of 38. The default precision is 18.

p是指数字位数，包括整数和小数。值域为[1,38]。默认为18。

s (scale)
The number of decimal digits that are stored to the right of the decimal point. This number is subtracted from p to determine the maximum number of digits to the left of the decimal point. Scale must be a value from 0 through p, and can only be specified if precision is specified. The default scale is 0 and so 0 <= s <= p. Maximum storage sizes vary, based on the precision.

s是指整数位数，值域[0,p]，可以不指定。

• 货币计算

储存时不会储存货币符号，只会储存数值。