53 lines
1.2 KiB
Plaintext
53 lines
1.2 KiB
Plaintext
# forth
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stack-based and lightweight programming language.
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it uses the {postfix} notation.
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# reading
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this book has a great pace and nice illustrations
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=> https://www.forth.com/starting-forth starting forth book
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# some words
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## running words
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these are some words for doing arithmetic with paces (min/km) and velocities (km/hr)
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``` forth words
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: ms>s swap 60 * + ; ( min segs -- segs )
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: hms>s ms>s swap 3600 * + ; ( hr min segs -- segs )
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: msd>s1k >r ms>s 1000 swap r> */ ; ( min segs metros -- segs1km )
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: paso>vel ms>s s1k>vel ; ( min segs -- vel )
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: s1k>vel 3600 swap / ; ( segs1km -- vel )
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: vel>s1k 3600 swap / ; ( vel -- segs1km )
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: .min 0 <# [CHAR] ' HOLD #S #> TYPE ; ( min -- )
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: .seg 0 <# [CHAR] " HOLD # # #> TYPE ; ( segs -- )
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: .ms 60 /mod .min .seg ; ( segs -- )
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: .vel . ." km/hr " ;
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: lista-velocidades cr 21 10 do i dup . vel>s1k .ms cr loop ;
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```
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for example, to convert a velocity to a pace, and print it:
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``` input: 18, output: 3'20"
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18 vel>s1k .ms
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3'20" ok
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```
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to do the opposite operation:
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``` input: 3 20, output: 18 km/hr
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3 20 ms>s s1k>vel .vel
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18 km/hr ok
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```
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to get the pace of a given segment, using minutes, seconds and distance in meters:
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``` input: 1 03 300, output: 3'30"
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1 03 300 msd>s1k .ms
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3'30" ok
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```
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