bc, dc: refresh page (#7670)

pages/common/dc.md

@@ -1,24 +1,29 @@
 # 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>.
 
-- Run calculator in interactive mode:
+- Start an interactive session:
 
 `dc`
 
-- Execute dc script in file:
+- Execute a script:
 
-`dc -f {{file}}`
+`dc {{path/to/script.dc}}`
 
-- Calculate 4 times 5 [4 5 *], subtract 17 [17 -], and [p]rint the output (using echo):
+- Calculate an expression with the specified scale:
 
-`echo "4 5 * 17 - p"| dc`
+`dc --expression='{{10}} k {{5 3 /}} p'`
 
-- Set number of decimal places to 7 [7 k], calculate 5 divided by -3 [5 _3 /] and [p]rint (using dc -e):
+- Calculate 4 times 5 (4 5 *), subtract 17 (17 -), and [p]rint the output:
 
-`dc -e "7 k 5 _3 / p"`
+`dc --expression='4 5 * 17 - 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:
+- Set number of decimal places to 7 (7 k), calculate 5 divided by -3 (5 _3 /) and [p]rint:
 
-`dc -e "100 k 5 v 1 + 2 / p"`
+`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'`