manual:chapter6:constants:cmd_piconst [newRPL User Manual]

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==== π ====
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Push the symbolic constant 'π' on the stack
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<callout color="green" icon="fa fa-indent" title="Stack Diagram">
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^  __Input Stack__  ^  ^  __Output Stack__  ^
|  ****  |  **→**  |  **C<sub>π</sub>**  |
|  //Level 1 / Argument 1//  |  //→//  |  //Level 1//  |


{{page>manual:chapter6:aux:legend&nofooter&noeditbtn&inline}}

| **Keyword type**  | [[manual:chapter5:basics#analytic-functions|Analytic Function]]  ||
| **Parallel list processing capabilities**  | [[manual:chapter5:listproc#group-1commands-that-cannot-parallel-process|Group 1]]  | //Commands that cannot parallel process//  |
| **Affected by flags**  | //None//  ||














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<callout color="orangered" icon="fa fa-comment" title="Description">
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The ''π'' function pushes on the stack a symbolic representation of the constant $π$.

Application of the ''[[manual:chapter6:operators:cmd_ovr_num|→NUM]]'' operator returns its closest approximation to 2000-digits accuracy, irrespective of the numeric precision defined by ''[[manual:chapter6:arithmetic:cmd_setprec|SETPREC]]''. This is done to ensure maximum accuracy if the symbolic expression is ultimately converted to a real number.
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''π'' is not fully equivalent to its **userRPL** counterpart.

In particular:

  * **userRPL** returns the closest approximation of $π$ to 12-digits accuracy.
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<callout type="info" icon="true" title="Usage">
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**__Input__**
<code>
« 6 SETPREC
  π →NUM
  DUP
  1 *
»
</code>
\\
**__Output__**
<code>
4:                                      
3:                                      
2:                        3.14159265359.
1:                              3.14159.
…………………………………………………………………………………………………………
                                        
</code>
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