mirror of
https://github.com/QB64Official/qb64.git
synced 2024-07-16 21:15:15 +00:00
40 lines
853 B
Markdown
40 lines
853 B
Markdown
|
The [_PI](_PI) function returns **<EFBFBD>** as a [_FLOAT](_FLOAT) value with an optional multiplier parameter.
|
|||
|
|
|
|||
|
|
## Syntax
|
|||
|
|
|
|||
|
|
> circumference = [_PI](_PI)[(multiplier)]
|
|||
|
|
|
|||
|
|
## Parameter(s)
|
|||
|
|
|
|||
|
|
* Optional multiplier (*2 * radius* in above syntax) allows multiplication of the π value.
|
|||
|
|
|
|||
|
|
## Description
|
|||
|
|
|
|||
|
|
* Function can be used in to supply π or multiples in a program.
|
|||
|
|
* Accuracy is determined by the return variable type [AS](AS) [SINGLE](SINGLE), [DOUBLE](DOUBLE) or [_FLOAT](_FLOAT).
|
|||
|
|
* The <20> value can also be derived using 4 * [ATN](ATN)(1) for a [SINGLE](SINGLE) value.
|
|||
|
|
|
|||
|
|
## Example(s)
|
|||
|
|
|
|||
|
|
Calculating the area of a circle using a [SINGLE](SINGLE) variable in this case.
|
|||
|
|
|
|||
|
|
```vb
|
|||
|
|
|
|||
|
|
radius = 5
|
|||
|
|
circlearea = _PI(radius ^ 2)
|
|||
|
|
PRINT circlearea
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
```text
|
|||
|
|
|
|||
|
|
78.53982
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## See Also
|
|||
|
|
|
|||
|
|
* [_ATAN2](_ATAN2), [TAN](TAN)
|
|||
|
|
* [ATN](ATN) (arctangent)
|
|||
|
|
* [SIN](SIN), [COS](COS)
|