はじめてのRuby 第13章 / Ruby Practice 13

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ͨͷ͍͠3VCZୈষ

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ͨͷ͍͠  ᵋ ?@?P ᵏ

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3VCZ

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ୈճ

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ୈষ"SSBZΫϥε

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഑ྻͷ෮श

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w ͋ΔΠϯσοΫεͷཁૉΛऔΓग़͢͜ͱ͕Ͱ͖Δ  w ͋ΔΠϯσοΫεͷཁૉʹ஋Λ֨ೲ͢Δ  w ΠςϨʔλΛ࢖ͬͯҰͭͣͭऔΓग़͢ ഑ྻͷ෮श QSJOUBSSBZ<> QSJOUBSSBZ<>lౡాz BSSBZFBDIEPcOBNFc  QVUTOBNF  FOE

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഑ྻͷ࡞Γํ

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w ഑ྻͷ࡞Γํʹ͸ҎԼͷ༷ͳ΋ͷ͕͋Δ "SSBZOFXΛ࢖͏ Ҿ਺Λࢦఆ͢Δͱ ͦͷ਺͚ͩOJM ͰॳظԽͨ͠഑ྻΛੜ੒ ͭࢦఆ͢Δͱ ࢦఆͨ͠਺Ͱ  ཁૉ਺෼ॳظԽ

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w จࣈྻ഑ྻΛ࢖͍͍ͨ৔߹ XΛ࢖͏͜ͱ͕Ͱ͖ ΔʢΧοίͷதʹจࣈྻΛۭന۠੾ΓͰฒ΂Δʣ    w γϯϘϧͷ഑ྻΛ࡞Γ͍ͨ৔߹͸ JͰ࡞Δ͜ͱ ͕Ͱ͖Δ X΍JΛ࢖͏

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w ഑ྻʹ͍ͨ͠จࣈྻΛғ͏ͨΊͷ۠੾Γจࣈ͸ɺ ʮʢʣʯҎ֎ʹ΋ز͔ͭ࢖͑Δ΋ͷ͕͋Δ      w ʮจࣈྻதʹ۠੾Γจࣈؚ͕·Ε͍ͯͳ͍ʯ͜ͱ ʹؾΛ഑ͬͯɺ্ͷͭͷ͏ͪͲΕ͔Λ࢖͏Α͏ʹ ͢Δ X΍JΛ࢖͏

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w UP@BϝιουΛ࢖͏ͱ ଞͷΦϒδΣΫτΛ഑ྻ ΦϒδΣΫτʹม׵͢Δࣄ͕Ͱ͖Δ    UP@BϝιουΛ࢖͏

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w จࣈྻΦϒδΣΫτͷTQMJUϝιουΛ࢖͏ͱɺࢦ ఆͨ͠จࣈͰ۠੾ΒΕͨจࣈྻ͕"SSBZΦϒδΣ Ϋτͱͯ͠ฦ͞ΕΔ    w ৄ͘͠͸ষͰʂ จࣈྻͷTQMJUϝιουΛ࢖͏

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ΠϯσοΫεͷ࢖͍ํ

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w ഑ྻʹΠϯσοΫεΛࢦఆ BSZ ͢Δ͜ͱͰ ཁૉΛऔΓग़͢͜ͱ͕Ͱ͖Δ w <>ϝιουͷ࢖͍ํ͸ҎԼͷ௨Γ B BPSB B ཁૉΛऔΓग़͢

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w ΠϯσοΫε͕OͷཁૉΛͭऔΓग़͢ํ๏ w ΠϯσοΫεʹ͸ෛͷ஋Λࢦఆ͢Δ͜ͱ͕Ͱ͖Δ Bͷ࢖͍ํ B<> B<> B<> B<> B<> B<>ͰΞΫηεՄೳ B<>ͰΞΫηεՄೳ

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w B͔ΒB·ͰͷཁૉΛฒ΂ͨ৽͍͠഑ྻΛ࡞ͬ ͯฦ͢ w B<>ͱͨ͠৔߹ɺ͕ฦΔ        w N഑ྻαΠζͷ৔߹͸ ഑ྻͷҰ൪ޙΖͷཁૉΛ ࢦఆͨ͠৔߹ͱಉ݁͡ՌʹͳΔ Bͷ࢖͍ํ lBz lCz lDz lEz lFz ഑ྻB B<>

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w B͔ΒMFOݸઌ·ͰͷཁૉΛฒ΂ͨ৽͍͠഑ྻΛ ฦ͢ w B< >ͱͨ͠৔߹ ͕ฦΔ Bͷ࢖͍ํ lBz lCz lDz lEz lFz ഑ྻB B< >

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w ࢖༻ྫ  ཁૉΛऔΓग़͢

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w <>ϝιουҎ֎ʹ΋ɺಉ͡Α͏ͳಇ͖Λ͢Δϝιο υ͕͍͔ͭ͋͘Δ ཁૉΛऔΓग़͢ ΞΫηεํ๏ ରԠ͢Δૢ࡞ BBU O B BTMJDF O B BTMJDF ON B BTMJDF O MFO B

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w BJUFNͱ͢Δ͜ͱͰ BͷཁૉΛJUFNʹม ߋ͢Δ͜ͱ͕Ͱ͖Δ          w B΍BΛ࢖ͬͨ୅ೖ΋Մೳ ཁૉΛஔ͖׵͑Δ

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w ഑ྻBͷ൪໨ʹཁૉΛૠೖ͢Δ          w ʮ΋ͱͷ഑ྻͷݸͷཁૉΛஔ͖׵͑Δʯͱߟ͑Δͱ BX 9:; ͱ͔͚Δ ཁૉΛૠೖ͢Δ lBz lCz lDz lEz lFz ഑ྻB lBz lCz lDz lEz lFz ഑ྻB l9z l:z

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w WBMVFT@BUϝιουΛ࢖͏ͱ ඈͼඈͼͷཁૉΛࢀ রͭ͠ͷ৽͍͠഑ྻΛ࡞Δ͜ͱ͕Ͱ͖Δ w BWBMVFT@BU O O ʜ ͱ͢Δͱ   B ʜ >ͱ͍ͬͨ഑ྻΛฦ͢ ෳ਺ͷΠϯσοΫε͔Β഑ྻΛ࡞Δ

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ू߹ͱͯ͠ͷ഑ྻ

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w "SSBZΫϥεͷΦϒδΣΫτ͸ू߹ͱͯ͠࢖͏͜ͱ ΋Ͱ͖Δ w 3VCZͰ͸ ҎԼͷΑ͏ʹͯ͠ڞ௨ू߹ͱ࿨ू߹ ू߹ͷࠩΛٻΊΔ͜ͱ͕Ͱ͖Δ ू߹ͷԋࢉ BSZBSZڞ௨ू߹ BSZcBSZ࿨ू߹ BSZBSZू߹ͷࠩ

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w ίʔυྫ        ू߹ͷԋࢉ

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w ίʔυྫ      w ഑ྻΛ݁߹͢Δϝιουʹ͸ʮʛʯͷଞʹʮʴʯ ͕͋Δ͕ɺ஋͕ॏෳͨ͠৔߹ͷڍಈ͕͜ͱͳΔ ू߹ͷԋࢉ

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ʮྻʯͱͯ͠ͷ഑ྻ

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w ഑ྻ͸2VFVF΍4UBDLͱͯ͠΋࢖͏͜ͱ͕Ͱ͖Δ w ഑ྻͱελοΫ͸ؔ܎ͳ͍΍Ζ w "SSBZΫϥεʹ͸ QVTI΍QPQͱݴͬͨΑ͏ͳϝιο υ͕༻ҙ͞Ε͍ͯΔʢελοΫPSΩϡʔϥΠΫͳ ૢ࡞͕Մೳʣ ʮྻʯͱͯ͠ͷ഑ྻ

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w ίʔυྫ ʮྻʯͱͯ͠ͷ഑ྻ ઌ಄ཁૉʹରͯ͠ ຤ඌཁૉʹରͯ͠ ཁૉ௥Ճ VOTIJGU QVTI औΓग़͠ TIJGU QPQ ࢀর pSTU MBTU

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഑ྻͷओͳϝιου

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w ഑ྻʹཁૉΛՃ͑Δํ๏͸͍͔ͭ͋͘Δ w BVOTIJGU JUFN   ഑ྻBͷઌ಄ʹJUFNΛૠೖ͢Δ w BJUFN BQVTI JUFN   ഑ྻBͷ຤ඌʹJUFNΛૠೖ͢Δ ഑ྻʹཁૉΛՃ͑Δ

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w BDPODBU C BC  ഑ྻBʹผͷ഑ྻCΛ࿈݁͢ΔDPODBUϝιου͸ ഁյతʢBͷཁૉΛมߋ͢Δʣ͕ ϝιου͸࿈ ݁ͨ͠৽͍͠഑ྻΛฦ͢ w BJUFN BJUFN BJUFN  ഑ྻBͷࢦఆͨ͠෦෼ͷཁૉΛJUFNʹஔ͖׵͑Δ ഑ྻʹཁૉΛՃ͑Δ

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w ίʔυྫ ഑ྻʹཁૉΛՃ͑Δ

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w Ϩγʔόʹ౰ͨΔΦϒδΣΫτͷ಺෦ঢ়ଶΛมߋ ͯ͠͠·͏ϝιουͷ͜ͱΛʮഁյతϝιουʯ ͱ͍͏ w ҎԼͷΑ͏ͳ΋ͷ͸ഁյతϝιου ʲίϥϜʳഁյతϝιου

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w ҎԼͷΑ͏ͳ৔߹ʹ͸஫ҙ͕ඞཁͰ͋Δ        w BͱC͸ಉ͡ΦϒδΣΫτΛࢦ͍ࣔͯ͠͠ΔͨΊ ഁյతϝιουΛར༻ͯ͠Cͷ಺༰Λมߋ͢Δͱม ਺Bʹ΋มߋ͕ٴΜͰ͠·͏ ʲίϥϜʳഁյతϝιου

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w ഁյతϝιουͷΑ͏ʹ ΦϒδΣΫτͷத਎Λม ߋͯ͠͠·͏Α͏ͳॲཧΛېࢭ͢Δϝιου͕͋ Δ 0CKFDUGSFF[F       w GSFF[Fͨ͠΋ͷΛมߋ͠Α͏ͱ͢ΔͱΤϥʔͱͳ Δ 3VOUJNF&SSPS ʲίϥϜʳഁյతϝιου

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w 3VCZͷϝιου໊ʹ͸ ʮʂʯ͕෇͍͍ͯΔ෺͕ ͋Δ w ഁյతϝιουͱඇഁյతϝιου͕ଘࡏ͢Δ৔ ߹ ഁյతϝιουͷ΋ͷʹ͸ʮʂʯΛ෇͚Δͱ͍ ͏ϧʔϧʹͳ͍ͬͯΔ w ͨͩ͠ ͢΂ͯͷഁյతϝιουʹʮʂʯ͕෇͍ͯ ͍ΔΘ͚Ͱ͸ͳ͍ͷͰ஫ҙʢEFMFUF@JGͱ͔ʣ ʲίϥϜʳഁյతϝιου

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w ͋Δ৚݅ʹैͬͯ഑ྻΛऔΓআ͘ϝιου͕༻ҙ ͞Ε͍ͯΔ w BDPNQBDU BDPNQBDU  ഑ྻBͷத͔Βཁૉ͕OJMͰ͋Δ΋ͷΛऔΓআ͘ DPNQBDUϝιου͸OJMΛऔΓআ͍ͨ৽͍͠഑ྻ Λฦ͢ͷʹରͯ͠ DPNQBDUϝιου͸΋ͱͷ ഑ྻΛஔ͖׵͑Δʢഁյతϝιουʣ ഑ྻ͔ΒཁૉΛऔΓআ͘

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w BEFMFUF Y   ഑ྻB͔ΒཁૉYΛऔΓআ͘Ϩγʔόࣗ਎Λมߋ ͢Δഁյతϝιου w BEFMFUF@BU O   ഑ྻBͷO൪໨ͷཁૉʢBʣΛ࡟আ͢Δഁյత ϝιου ഑ྻ͔ΒཁૉΛऔΓআ͘

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w DPNQBDU EFMFUF EFMFUF@BUͷྫ ഑ྻ͔ΒཁૉΛऔΓআ͘

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w BEFMFUF@JG\cJUFNcʜ^  BSFKFDU\cJUFNcʜ^  BSFKFDU\cJUFNcʜ^    ഑ྻBͷ֤ཁૉʹ͍ͭͯ ϒϩοΫͷ࣮ߦ݁Ռ͕USVF ͩͬͨ৔߹ʹB͔ΒཁૉΛऔΓআ͘EFMFUF@JGͱ SFKFDU͸ഁյతϝιουͰ͋Δ ഑ྻ͔ΒཁૉΛऔΓআ͘

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w BTMJDF O BTMJDF ON BTMJDF O MFO   ഑ྻB͔Βࢦఆ͞ΕͨൣғͷཁૉΛऔΓআ͖ औΓ আ͍ͨ஋Λฦ͢͢΂ͯഁյతϝιου w BVOJR BVOJR  ഑ྻBͷॏෳ͢ΔཁૉΛ࡟আ͢Δ ഑ྻ͔ΒཁૉΛऔΓআ͘

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w EFMFUF@JG SFKFDU TMJDF VOJRͷྫ ഑ྻ͔ΒཁૉΛऔΓআ͘

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w BTIJGU  Bͷઌ಄ཁૉΛऔΓআ͖ औΓআ͍ͨ஋Λฦ͢ w BQPQ  ഑ྻBͷ຤ඌཁૉΛऔΓআ͖ औΓআ͍ͨ஋Λฦ͢ ഑ྻ͔ΒཁૉΛऔΓআ͘

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w ഑ྻͷதͷཁૉΛผͷཁૉʹஔ͖׵͑ΔγϦʔζ w ͕෇͘΋ͷ͸ഁյతϝιουͰ͋Γ ͔ͭͳ͍΋ ͷ͸৽͘͠ΦϒδΣΫτΛ࡞ͬͯฦ͢ ഑ྻͷཁૉΛஔ͖׵͑Δ

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w BDPMMFDU\cJUFNcʜ^ BDPMMFDU   BNBQ\cJUFNcʜ^ BNBQ     ഑ྻBͷ֤ཁૉJUFNʹϒϩοΫΛద༻͠ ͦͷ݁Ռ ΛूΊͯ৽͍͠഑ྻΛ࡞Δ w ཁૉ਺͸ͦͷ··͕ͩ ֤ཁૉ͕ϒϩοΫʹΑͬͯ Ճ޻͞Εͨ΋ͷʹͳ͍ͬͯΔ ഑ྻͷཁૉΛஔ͖׵͑Δ

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w BpMM WBMVF   BpMM WBMVF CFHJO   BpMM WBMVF CFHJO MFO   BpMM WBMVF ON     ഑ྻBͷཁૉΛWBMVFʹஔ͖׵͑Δͭ໨͸͢΂ͯ ͷཁૉΛWBMVFʹ ͭ໨͸CFHJOҎ߱Λ ͭ໨͸ CFHJO͔ΒMFOݸ ͭ໨͸ONͷൣғΛWBMVFʹஔ ͖׵͑Δ ഑ྻͷཁૉΛஔ͖׵͑Δ

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w BqBUUFO  BqBUUFO    ഑ྻBΛฏୱԽ͢ΔฏୱԽͱ͸ ೖΕࢠʹͳͬͨ ഑ྻΛల։ͯͭ͠ͷେ͖ͳ഑ྻʹ͢Δ͜ͱ    < < > < < >>>< > ഑ྻͷཁૉΛஔ͖׵͑Δ

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w DPMMFDU NBQ pMMͷྫ  ഑ྻͷཁૉΛஔ͖׵͑Δ

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w BSFWFSTF  BSFWFSTF    ഑ྻBͷཁૉΛٯॱʹฒ΂ସ͑Δ w BTPSU BTPSU  BTPSU\cJ Kcʜ^ BTPSU\cJ Kcʜ^    ഑ྻBͷཁૉΛιʔτ͢Δॱং͸ϒϩοΫͰࢦఆ ͢Δ͜ͱ͕Մೳ ഑ྻͷཁૉΛஔ͖׵͑Δ

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w BTPSU@CZ\cJcʜ^    ഑ྻBͷཁૉΛฒ΂ସ͑Δฒ΂ସ͑͸͢΂ͯͷཁ ૉʹ͍ͭͯϒϩοΫΛධՁͨ݁͠ՌΛιʔτͨ͠ ॱʹߦΘΕΔ ഑ྻͷཁૉΛஔ͖׵͑Δ

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w SFWFSTF TPSU TPSU@CZͷྫ ഑ྻͷཁૉΛஔ͖׵͑Δ

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഑ྻ಺ͷ֤ཁૉΛॲཧ͢Δ

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w ΦʔιυοΫεͳ΍Γ͔ͨ͸ ϧʔϓΛ·Θͯ͠ ΠϯσοΫεΛ࢖͍ͭͣͭΞΫηε͢Δ ܁Γฦ͠ͱΠϯσοΫεΛ࢖͏

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w FBDIϝιουΛ࢖͑͹ൣғΛ໌ࣔతʹॻ͔ͣʹ ͢΂ͯͷཁૉʹΞΫηεͰ͖Δ w FBDI@XJUI@JOEFYϝιουΛ࢖͑͹ ཁૉͱͦͷ ΠϯσοΫεΛ྆ํऔಘͰ͖Δ FBDIϝιουΛར༻͢Δ

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w ʮ഑ྻͷ֤ཁૉʹର͢Δॲཧ͕ऴΘͬͨ࣌ ͦͷ ഑ྻ͸ࠓޙඞཁͳ͍ʯͱ͍ͬͨ৔߹ʹ͸ QPQϝ ιουΛ࢖ͬͯॲཧΛ͢Δͱ͍͏ํ๏΋͋Δ ഁյతͳϝιουͰ܁Γฦ͠Λߦ͏

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w ࠓճ঺հͨ͠ϝιουҎ֎ʹ΋ ઌఔ঺հͨ͠ NBQ΍DPMMFDUͷΑ͏ͳΠςϨʔλ͕͋Δ w େମͷॲཧ͸༻ҙ͞Ε͍ͯΔ͕ ࣗ෼Ͱ࡞Γ͍ͨ ͱࢥͬͨΒʮ͠ΐ͏͕ͳ͍ͳ͊ʯͱݴ͍ͳ͕Β ࡞Δͷ΋͍͍ͱࢥ͏ ഑ྻ಺ͷ֤ཁૉΛॲཧ͢Δ

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഑ྻͷཁૉ

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w ഑ྻͷཁૉ͸$ͱҧͬͯෳ਺ͷΦϒδΣΫτΛ ͭͷ഑ྻͰอ࣋͢Δ͜ͱ͕Ͱ͖Δ w ഑ྻͷதʹ഑ྻΛೖΕΔʢೖΕࢠʹ͢Δʣࣄ΋ Ͱ͖Δ ഑ྻͷཁૉ

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w ߦྻΛʮߦྻͷߦྻʢ࣍ݩ഑ྻʣʯΛ࢖ͬͯද ݱ͍ͨ͠ w ҎԼͷΑ͏ͳ഑ྻΛ഑ྻΛ࢖ͬͯ࡞੒͢Δʹ͸  Ͳ͏ͨ͠Βྑ͍ͩΖ͏͔ʁ ؆୯ͳߦྻΛѻ͏ A = 0 @ 1 2 3 4 5 6 7 8 9 1 A

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w ഑ྻͷதʹ഑ྻΛೖΕࢠʹͯ͠ੜ੒͢Ε͹͍͍ w ߦྻNߦOྻͷཁૉΛऔΓग़͍ͨ͠৔߹͸   BSZͱͯ͠ΞΫηε͢Ε͹औΓग़͢͜ ͱ͕Ͱ͖Δ ؆୯ͳߦྻΛѻ͏

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w ഑ྻΦϒδΣΫτͷॳظԽʹ͸Ұ෼஫ҙ͕ඞཁ Ͱ͋Δ w ҎԼͷΑ͏ͳίʔυΛ࣮ߦͨ࣌͠ ͲͷΑ͏ʹද ࣔ͞ΕΔͩΖ͏͔ʁ ॳظԽʹ஫ҙ ཁૉͷ഑ྻΛ< >ͰॳظԽ

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w ഑ྻB͸ҎԼͷΑ͏ʹͳ͍ͬͯΔ    w ͚͔ͭͩ͠มߋ͍ͯ͠ͳ͍ͷʹԿނ͜͏ͳͬͨ ͷ͔ ॳظԽʹ஫ҙ

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w "SSBZOFX TJ[F WBM ͱ͍͏ํ๏͸ ཁૉ਺TJ[F ͷ഑ྻΛWBMͰॳظԽͯ͠ฦ͢ͱ͍͏΋ͷ w ͜ͷࡍWBM͸ෳ੡͞ΕΔͷͰ͸ͳ͘ ഑ྻͷཁૉ ͢΂͕ͯͭͷWBMΛࢀর͢Δͱ͍͏࢓༷ʹͳͬ ͍ͯΔ ॳظԽʹ஫ҙ ੜ੒͞Εͨ ഑ྻ WBM

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w ഑ྻͷ֤ཁૉʹผʑͷΦϒδΣΫτΛ୅ೖͨ͠ ͍৔߹͸ ϒϩοΫΛࢦఆͯ͠ॳظԽ͢Δͱྑ͍ w ϒϩοΫม਺Λ࡞੒͢Δͱ ରԠ͢ΔཁૉͷΠϯ σοΫε TJ[FͳΒJEYʹ͸ʙ͕ೖΔʣ͕֨ ೲ͞ΕΔ ॳظԽʹ஫ҙ

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ෳ਺ͷ഑ྻʹ  ฒߦͯ͠ΞΫηε͢Δ

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w ೚ҙͷ਺ͷ഑ྻ͕͋ͬͯ ͦΕΒͷಉ͡Πϯσο ΫεͷཁૉΛ·ͱΊ͍ͨʢ·ͱΊͯॲཧΛͨ͠ ͍ʣ w ͳʹΛݴ͍ͬͯΔ͔Θ͔Γʹ͍͘ͷͰίʔυΛ ࣔ͢ ෳ਺ͷ഑ྻʹฒߦͯ͠ΞΫηε

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w ͜ͷΑ͏ͳॲཧ͸[JQϝιουΛ࢖͏ͱ؆ܿʹه ड़͢Δ͜ͱ͕Ͱ͖Δ w [JQϝιου͸ ࣗ਎ͱҾ਺ʹ౉ͨ͠഑ྻͷ֤ཁ ૉ͔ΒͳΔ഑ྻͷ഑ྻΛੜ੒ͯ͠ฦ͢ ෳ਺ͷ഑ྻʹฒߦͯ͠ΞΫηε

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w [JQϝιουʹϒϩοΫΛ౉͞ͳ͚Ε͹࣍ͷΑ͏ ͳڍಈʹͳΔ ෳ਺ͷ഑ྻʹฒߦͯ͠ΞΫηε ֤഑ྻͷ൪໨ͷཁૉ

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ࠓճͷ·ͱΊ

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·ͱΊ w ഑ྻ͸BSZ͚ͩͰͳ͘ BSZ΍BSZ BSZͱ͍ͬͨΞΫηεΛ͢Δ͜ͱ͕Ͱ ͖Δ w ൣғΛࢦఆͯ͠Ұׅஔ͖׵͕͑ՄೳͰ͋Δ w Ωϡʔ΍ελοΫͷΑ͏ʹѻ͏͜ͱ͕Ͱ͖Δ w ͕෇͍ͨϝιου͸ഁյతͰ͋Δʢ͢΂ͯͷഁ յతϝιουʹ͕͍͍ͭͯΔΘ͚Ͱ͸ͳ͍ʣ