[ Skill ] 中如何获取内置的数学常量？
https://www.cnblogs.com/yeungchie/
- code
defMathConstants(s_id)
- describe
- s_id 类型为 symbol
- 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\n" ycMath.PI)
=>3.141593
=>t