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# dc
> An arbitrary precision calculator. Uses reverse polish notation (RPN).
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> See also: `bc`.
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> More information: <https://www.gnu.org/software/bc/manual/dc-1.05/html_mono/dc.html>.
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- Start an interactive session:
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`dc`
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- Execute a script:
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`dc {{path/to/script.dc}}`
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- Calculate an expression with the specified scale:
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`dc --expression='{{10}} k {{5 3 /}} p'`
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- Calculate 4 times 5 (4 5 *), subtract 17 (17 -), and [p]rint the output:
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`dc --expression='4 5 * 17 - p'`
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- Specify the number of decimal places to 7 (7 k), calculate 5 divided by -3 (5 _3 /) and [p]rint:
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`dc --expression='7 k 5 _3 / p'`
- Calculate the golden ratio, phi: set number of decimal places to 100 (100 k), square root of 5 (5 v) plus 1 (1 +), divided by 2 (2 /), and [p]rint result:
`dc --expression='100 k 5 v 1 + 2 / p'`
