[ Skill ] 中如何获取内置的数学常量？

https://www.cnblogs.com/yeungchie/

• code

defMathConstants(s_id)

• describe

1. s_id 类型为 symbol
2. 通过 s_id.Name 获取目标常量。

Name	Meaning
E	The base of natural logarithms. (e)
LOG2E	The base-2 logarithm of e
LOG10E	The base-10 logarithm of e
LN2	The natural logarithm of 2.
LN10	The natural logarithm of 10.
PI	The ratio of the circumference of a circle to its diameter.(π)
PI_OVER_2	π / 2
PI_OVER_4	π / 4
ONE_OVER_PI	1 / π
TWO_OVER_PI	2 / π
TWO_OVER_SQRTPI
SQRT_TWO	(The positive square root of 2.)
SQRT_POINT_FIVE	(The positive square root of 1/2.)
INT_MAX	The maximum value of a SKILL integer.
INT_MIN	The minimum value of a SKILL integer.
DBL_MAX	The maximum value of a SKILL double.
DBL_MIN	The minimum value of a SKILL double.
SHRT_MAX	The maximum value of a SKILL "short" integer.
SHRT_MIN	The minimum value of a SKILL "short" integer.

The minimum value of a SKILL integer is -2147483648.
The minimum literal value which may appear in a program is -2147483647.

• example

; 获取 π
defMathConstants('ycMath)
printf("%f
" ycMath.PI)

=>3.141593
=>t