Difference between revisions of "Pi"
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π (greek letter pi) is the ratio of the circumference of a circle to its diameter. | π (greek letter pi) is the ratio of the circumference of a circle to its diameter. | ||
| − | π is about <syntaxhighlight lang="pascal" | + | π is about <syntaxhighlight lang="pascal" inline>3.14159265358979</syntaxhighlight>. |
| − | A full circle has <syntaxhighlight lang="pascal" | + | A full circle has <syntaxhighlight lang="pascal" inline>2*pi()</syntaxhighlight> [[Radian|radians]]. |
| − | In [[Free Pascal|Free Pascal's]] [[RTL]], <syntaxhighlight lang="pascal" | + | In [[Free Pascal|Free Pascal's]] [[RTL]], <syntaxhighlight lang="pascal" inline>system.pi</syntaxhighlight> is a [[Function|<syntaxhighlight lang="pascal" inline>function</syntaxhighlight>]] which returns the value of π. |
| − | This allows you to assign <syntaxhighlight lang="pascal" | + | This allows you to assign <syntaxhighlight lang="pascal" inline>addr(system.pi)</syntaxhighlight> to a procedural variable. |
| − | <syntaxhighlight lang="pascal" | + | <syntaxhighlight lang="pascal" inline>pi()/4</syntaxhighlight> is the same as <syntaxhighlight lang="pascal" inline>arctan(1)</syntaxhighlight>. |
== See also == | == See also == | ||
| − | * {{Doc|package=RTL|unit=system|identifier=pi|text=<syntaxhighlight lang="pascal" | + | * {{Doc|package=RTL|unit=system|identifier=pi|text=<syntaxhighlight lang="pascal" inline>system.pi</syntaxhighlight>}} |
| − | * {{Doc|package=RTL|unit=system|identifier=arctan|text=<syntaxhighlight lang="pascal" | + | * {{Doc|package=RTL|unit=system|identifier=arctan|text=<syntaxhighlight lang="pascal" inline>system.arctan</syntaxhighlight>}} calculates arc tangent. |
Latest revision as of 17:14, 6 August 2022
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π (greek letter pi) is the ratio of the circumference of a circle to its diameter.
π is about 3.14159265358979.
A full circle has 2*pi() radians.
In Free Pascal's RTL, system.pi is a function which returns the value of π.
This allows you to assign addr(system.pi) to a procedural variable.
pi()/4 is the same as arctan(1).
See also
system.pisystem.arctancalculates arc tangent.
