Update cheatsheets

dc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dc
+
+> An arbitrary precision calculator. Uses reverse polish notation (RPN).
+> See also: `bc`.
+> More information: <https://www.gnu.org/software/bc/manual/dc-1.05/html_mono/dc.html>.
+
+- Start an interactive session:
+
+`dc`
+
+- Execute a script:
+
+`dc {{path/to/script.dc}}`
+
+- Calculate an expression with the specified scale:
+
+`dc --expression='{{10}} k {{5 3 /}} p'`
+
+- Calculate 4 times 5 (4 5 *), subtract 17 (17 -), and [p]rint the output:
+
+`dc --expression='4 5 * 17 - p'`
+
+- Specify the number of decimal places to 7 (7 k), calculate 5 divided by -3 (5 _3 /) and [p]rint:
+
+`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'`