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プログラミングの暗黙知
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Yuya Kono
April 25, 2021
Technology
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プログラミングの暗黙知
第37回#hiro_itで発表した内容です。
https://hiro-it.connpass.com/event/208894/
Yuya Kono
April 25, 2021
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Transcript
ʹΌʔΜʢ!UBLPFJHIUʣ ϓϩάϥϛϯάͷ҉ ୈճIJSP@JUʢʣ
ʹΌΜͰ͢ !UBLPFJHIU Տɹ༤ɹίϊɹϢϠ ϓϩάϥϛϯάݴޠ͕େ͖
ࠓ͢͜ͱ w ϓϩάϥϛϯάʹ͍ͭͯͷʮ҉ʯʹ͍ͭͯߟ͑Δ w ʮ҉ʯɺ͋·Γ໌จԽ͞Εͳ͍5*14ɾίπ w ͋·Γࢥ͍͔ͭͳ͔ͬͨͷͰɺΈͳ͞ΜͷܙΛआΓ͍ͨ
शΘͳ͍͜ͱ w ϓϩάϥϛϯάΛֶͿͨΊͷใݯͱͯͨ͘͞Μ͋Δ w 8FCɺॻ੶ɺ͜͏͍͏ษڧձɺ࠷ۙ:PV5VCFͷಈըͱ͔ w ϓϩάϥϚʹච·Ίਓ͕ଟ͍ʁ w ҰํͰɺ͋·ΓݴޠԽ͞Εͳ͍ɺ͍Θ҉ͨ͘͞Μ͋Δ w
গͳ͘ͱɺͪΌΜͱຊͰಡΜͩهԱ͕ͳ͍͕ࣝʹ͋Δ w ίϥϜͱ͔ͱ͔ɺຊے͔ΒҳΕͨͱ͜Ͱݴٴ͞ΕΔ͚ͲɺҰͷຊʹͳ Βͳ͍͕ࣝ͋Δ
҉ͷܕมҙΛཁ͢Δ ྫ͑ɺEPVCMFΛฦؔ͢BCT͕͋Δͱ͠Α͏ double abs(double x) { if (x
>= 0) { return x; } else { return -x; } } ͦͯ͠ɺ͜Μͳ෩ʹೖͨ͠ͱ͠Α͏ float x = abs(38.5); ͜Ε͍ʂ double -> floatͷ҉ͷܕมʂʂ ਫ਼͕མͪΔʂʂ
҉ͷܕมͷ൵ܶ 2ɿ fl PBUͰͳ͘EPVCMF͕ඞཁͳͱ͖ɺEPVCMFΛͬͯॻ͚͍͍ʁ "ɿ͍͍͑ɻ͕ࣗΒͳ͍ͱ͜ΖͰEPVCMF fl PBUͷ҉ͷܕม͕ى͖͍ͯ Δ͔͠Εͳ͍ɻ͜ͷ͜ͱΛௐΔͷ͍͠ɻ Ͳ͏͢Ε͍͍ʁ
ˠ҉ͷܕม͕ى͖ͳ͍Α͏ؾΛ͚ͭΔ8BMMΛͪΌΜͱ͚ͭΔ
͑Δͷͬͨํ͕͍͍ w ೖྗิͷ͍ํΛ֮͑Δ w ʮQSJOUG͚ͩͬʁQSJOUMOG͚ͩͬʁʯΘ͟Θ͟άάΔͷେม w ೖྗิΛ֮͑ΕɺQSJ5BCͰQSJOUGͱೖྗͰ͖Δ w ίϯύΠϧΤϥʔͷ͍ํΛ֮͑Δ w
ͲΜͳͱ͖ͰίϯύΠϧͰ͖Δɻʮ͔ͯ͠ΒίϯύΠϧʯͰͳ͘ ʮͪΐͬͱॻ͖͑ͨΒίϯύΠϧʯ
ࢥ͍͍ͭͨͷ͜ͷ͙Β͍ ͋ͳͨͷʮ҉ʯʁ
ୈ̏̓ճIJSP@JUͰͷΞΠσΟΞ w εϖʔεվߦͷೖΕํ w ίʔυϑΥʔϚολ w ίϝϯτͷॻ͖ํ w 8IBU 8IZ
)PX 8IZOPU w GPS͏ʁXIJMF͏ʁ w JG͏ʁTXJUDIDBTF͏ʁ w ΠσΟΦϚςΟΫͳίʔυͷॻ͖ํ w *%&ʹΑͬͯɺΑΓΠσΟΦϚ ςΟΫͳॻ͖ํʹม͢Δػೳ͕ ͍ͭͯͨΓ͢Δ
w εϖʔεվߦͷೖΕํ w ίʔυϑΥʔϚολ w ίϝϯτͷॻ͖ํ w 8IBU 8IZ )PX
8IZOPU w GPS͏ʁXIJMF͏ʁ w JG͏ʁTXJUDIDBTF͏ʁ w ΠσΟΦϚςΟΫͳίʔυͷॻ͖ํ w *%&ʹΑͬͯɺΑΓΠσΟΦϚ ςΟΫͳॻ͖ํʹม͢Δػೳ͕ ͍ͭͯͨΓ͢Δ