DESAMIS Go Training Season 1 Day 6

by Yutaka Kato

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(Pݚमୈظ %": :VUBLB,BUP   3% %&4".*4 %&4".*4ࣾ಺ݚम

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˞ લճͷ13ͷ   ղઆλΠϜ

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ݚमܭը ճ ೔࣍ ༧ఆ λΠτϧ ୈճ Ր (Pͷجຊ ୈճ Ր ؀ڥߏஙͱ(JU (JU)VCͷجຊ ୈճ Ր جຊߏจ ୈճ Ր ߏ଄ମɺεϥΠεɺϚοϓ ୈճ Ր ඪ४ϥΠϒϥϦ͸΍Ί͙Γ ୈճ Ր ϞδϡʔϧγεςϜͱ֎෦ϥΠϒϥϦ ୈճ Ր )FSPLV(Pೖ໳ ୈճ Ր "84-BNCEB(Pೖ໳ ୈճ Ր ฒߦॲཧϓϩάϥϛϯά ୈճ Ր ୯ମςετٕ๏ ୈճ Ր σʔλϕʔεΞΫηε ୈճ Ր 'ZOFʹΑΔ(6*ΞϓϦέʔγϣϯ։ൃ ୈճ Ր ࣾ಺(PϓϩδΣΫτͷίʔυղઆ

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ຊ೔ͷΰʔϧ w 🚩ΰʔϧ w (Pͷඪ४ϞδϡʔϧγεςϜΛशಘ͢Δ w ֎෦ϥΠϒϥϦͷ࢖͍ํɾ࡞ΓํΛशಘ͢Δ w ❌ΰʔϧͰ͸ͳ͍ w ϞδϡʔϧγεςϜͷػೳΛϚελʔ͢Δ

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(P.PEVMFT

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(P.PEVMFTͱ͸ w ґଘؔ܎ͷఆٛ΍ղܾΛߦͬͯ͘ΕΔϞδϡʔϧ؅ཧػ ߏ w ࠷ॳ͔Β͋ͬͨΘ͚Ͱ͸ͳ͘ɺ(PͰಋೖ͞Εͨ w ֎෦ϥΠϒϥϦͷऔಘ͸(JU΍.FSDVSJBM౳ͷόʔδϣ ϯ؅ཧπʔϧʹ೚͍ͤͯΔ w ͕͜͜OQN΍.BWFO΍1Z1J౳ͱେ͖͘ҧ͏ͱ͜ Ζ

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ୈճͷ͓͞Β͍ module github.com/u-motion/go-training-1/mika n go 1.16 HPNPEͷத਎ w ୈೋճͰ࣮ߦͨ͠ʮHPNPEJOJUʯͱ͍͏ίϚϯυ͸ɺࣗ෼ ઐ༻ͷϞδϡʔϧΛ࡞੒͢Δ࡞ۀ w ࣮ߦ͢ΔͱHPNPEͱ͍͏ϑΝΠϧ͕ੜ੒͞Εͨ

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֎෦ϥΠϒϥϦͷར༻ package mai n import ( "context " "fmt " "time " "github.com/mikan/syukujitsu-go " ) func main() { entries, err := syukujitsu.FetchAndParse(context.Background() ) if err != nil { panic(err ) } fmt.Printf("%d ݅ͷॕ೔ΛಡΈࠐΈ·ͨ͠\n", len(entries) ) if name, found := syukujitsu.Find(entries, time.Now()); found { fmt.Printf("ࠓ೔͸%sͰ͢ʂ\n", name ) } else { fmt.Printf("ࠓ೔͸ॕ೔Ͱ͸͋Γ·ͤΜ\n" ) } } 👇ࣸܦͯ͠ΈΑ͏ EBZTZVLVKJUTVNBJOHP ౷߹λʔϛφϧΛ։͍ͯʮgo mod tidyʯΛ࣮ߦ͢Δͱʜ

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HPNPEͱHPTVN module github.com/u-motion/go-training-1/mika n go 1.1 6 require github.com/mikan/syukujitsu-go v0.0.2 HPNPEʹSFRVJSF͕௥Ճ͞Εͨ github.com/mikan/syukujitsu-go v0.0.2 h1:nabT8z0OroVS8Yc2RoACF+a1UlUeGv … github.com/mikan/syukujitsu-go v0.0.2/go.mod h1:xDHnZ4BxbJlL0XQOvp7AaHO … golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M = golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDc … golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudc… HPTVN͕৽ͨʹੜ੒͞Εͨ HPTVN͸׬શͳґଘؔ܎ͷ೺Ѳͱվ͟Μ๷ࢭʹ໾ཱͭ   HPTVN΋(JUʹίϛοτ͢ΔϓϩδΣΫτ͕ଟ͍ 👈௚઀ͷґଘؔ܎ 👆ґଘͷґଘ

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όʔδϣϯఆٛ (P.PEVMFTͰ͸4FNBOUJD7FSTJPOJOH TFNWFS ʹै͏ W TFNBOUJDWFSTJPOJOH ϝδϟʔόʔδϣϯޙํඇޓ׵ͳมߋ࣌ʹ૿Ճ ϚΠφʔόʔδϣϯ৽ػೳͷ௥Ճ࣌ʹ૿Ճ ύονόʔδϣϯόάͷमਖ਼࣌ʹ૿Ճ import “my/thing/v2/sub/pkg“ TFNBOUJDJNQPSUWFSTJPOJOH ϝδϟʔόʔδϣϯΛ্͛Δ ޙํඇޓ׵ͳมߋ͕͋Δ ࡍ͸   ύοέʔδͷΠϯϙʔτύεΛม͑Δ

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(01"5)؀ڥม਺ w औΓࠐΜͩϞδϡʔϧ͸(01"5)ͱ͍͏؀ڥม਺͕ࢦఆͨ͠ ৔ॴͷதͷQLHNPEσΟϨΫτϦҎԼʹ֨ೲ͞ΕΔ w σΟεΫͷ͓૟আΛ͍ͨ͠৔ॴ͸͜͜Λ੔ཧ͠Α͏ w ࣗ෼͕࡞ΔϞδϡʔϧ͸(01"5)ͷTSDσΟϨΫτϦҎԼ ͷΠϯϙʔτύεͱҰகͨ͠৔ॴʹ഑ஔ͢Δඞཁ͕͋Δ w (01"5)ͷσϑΥϧτ஋͸ʮϗʔϜσΟϨΫτϦHPʯ w ୈճͷ؀ڥߏங࣌ʹ͜͜ʹϑΝΠϧΛஔ͘Α͏ࢦࣔͨ͠ͷ ͸͜ͷҝʂ

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(0.0%6-&؀ڥม਺ w (P.PEVMFTͷ༗ޮɾແޮΛ੾Γସ͑Δม਺ w (P͔Βಋೖ͞ΕͨͷͰ͜ͷΑ͏ͳ໊લʹͳ͍ͬͯΔ w (P͔Β͸ڧ੍PO ࢦఆͯ͠΋ແࢹ ͱͳΔ༧ఆ ઃఆ આ໌ σϑΥϧτͷಈ࡞ PO HPNPE HPTVNͰґଘؔ܎ղܾ (PҎ߱ P f (01"5)TSDҎԼʹґଘؔ܎ΛऔΓࠐΉ (PҎલ BVUP HPNPE͕͋Δ৔߹͸POͱͯ͠ৼΔ෣͏ (Pʙ

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༷ʑͳ؀ڥม਺ ؀ڥม਺ σϑΥϧτ஋ Α͋͘Δ࢖͍ॴ (01"5) )0.&HP64&3130'*-&HP ޷ΈͷσΟϨΫτϦͰ։ൃ͍ͨ͠ͱ͖ (03005 (PπʔϧνΣΠϯͷ৔ॴ ෳ਺ͷ(PόʔδϣϯΛ࢖͍෼͚Δͱ͖ (0#*/ (01"5)CJO ࣮ߦϑΝΠϧͷੜ੒৔ॴΛม͑Δͱ͖˞ (0"3$) ݱࡏͷ$16 BNE BSN౳ ΫϩείϯύΠϧ͢Δͱ͖ (004 ݱࡏͷ04 EBSXJOXJOEPXT౳ ΫϩείϯύΠϧ͢Δͱ͖ (01309: IUUQTQSPYZHPMBOHPSH EJSFDU ඇެ։ͳϞδϡʔϧΛऔಘ͍ͨ͠ͱ͖ (013*7"5& ۭ ඇެ։ͳϞδϡʔϧΛऔಘ͍ͨ͠ͱ͖ શͯͷҰཡ͸HPFOWίϚϯυͰ֬ೝͰ͖Δ ˞HPHFU΍HPJOTUBMM   ͢Δͱ͖ͷ࿩

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ެࣜϥΠϒϥϦ

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ެࣜϥΠϒϥϦ w ඪ४ϥΠϒϥϦʹؚΊΔ΄ͲͰ͸ͳ͍͕༗༻ͳ֎෦ϥΠϒϥϦ͕ ଟ਺ఏڙ͞Ε͍ͯΔ ४ඪ४ϥΠϒϥϦͱ΋͍ΘΕΔ w ޓ׵ੑͷཁ͕݅ඪ४ϥΠϒϥϦΑΓ௿͍͕ɺެࣜͷ(PϓϩδΣ ΫτͷҰ෦ͱͯ͠։ൃ͞Ε͍ͯΔ w 044ϥΠηϯε΋(Pຊମͱಉ͡#4%ϥΠηϯε ৚߲ w Πϯϙʔτύε͸ʮHPMBOHPSHYʯͰ࢝·Δ w ݟ͚ͭํ   IUUQTQLHHPEFWTFBSDI RHPMBOHPSH'Y

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஫໨ͷެࣜϥΠϒϥϦ ϥΠϒϥϦ ֓ཁ HPMBOHPSHYUFYU ଟݴޠରԠͳͲ༷ʑͳ؀ڥ޲͚ͷςΩετॲཧ HPMBOHPSHYOFU *$.1͔Β8FC4PDLFU·Ͱ༷ʑͳ௨৴ϓϩτίϧͷ࣮૷ HPMBOHPSHYPBVUI 0"VUIΫϥΠΞϯτͷ࣮૷ʹศར HPMBOHPSHYDSZQUP ༷ʑͳ҉߸ΞϧΰϦζϜ΍44)ϓϩτίϧ౳ͷ࣮૷ HPMBOHPSHYUPPMT lHPJNQPSUTz౳ͷ͍͔ͭ͘ͷศརίϚϯυ HPMBOHPSHYNPCJMF "OESPJEJ04αϙʔτͷͨΊͷ࣮ݧతͳϓϩδΣΫτ

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֤छ4%,

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Ϋϥ΢υϕϯμʔܥ w ༷ʑͳϕϯμʔ͕ެࣜͷ(P4%,Λఏڙ͍ͯ͠Δ w ͲΕ΋Α͘ϝϯςφϯε͞Ε͍ͯΔͷͰɺ҆৺ͯ͠࢖͑Δ ϕϯμʔ Ϟδϡʔϧ ϥΠηϯε උߟ (PPHMF DMPVEHPPHMFDPNHP "QBDIF αʔϏεຖʹϞδϡʔϧ͕෼͔ΕΔ (PPHMF HPPHMFHPMBOHPSHBQJ #4%$MBVTF "1*ΫϥΠΞϯτϥΠϒϥϦू "84 HJUIVCDPNBXTBXTTELHP "QBDIF ϞδϡʔϧͰશαʔϏεΛΧόʔ "84 HJUIVCDPNBXTBXTTELHPW "QBDIF αʔϏεຖʹϞδϡʔϧ͕෼͔ΕΔ .JDSPTPGU HJUIVCDPN"[VSFB[VSFTELHP .*5 ͍͔ͭ͘ͷαʔϏε͸ผϞδϡʔϧ 0SBDMF HJUIVCDPNPSBDMFPDJHPTEL 61- 4FNBOUJD*NQPSU7FSTJPOJOH࠾༻

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4BB4ܥ w ެࣜͷ΋ͷ͸ҙ֎ͱͳ͔ͬͨΓ׬੒౓͕௿͔ͬͨΓ͢Δ w ͜͜ʹڍ͛ͨ৘ใ͸কདྷ௠෗Խ͢ΔՄೳੑ͕͋Δ αʔϏε Ϟδϡʔϧ ϥΠηϯε උߟ (JU)VC HJUIVCDPNHPPHMFHPHJUIVCW #4%$MBVTF ͳ͔ͥ(PPHMF͕࡞͍ͬͯΔ 4MBDL HJUIVCDPNTMBDLHPTMBDL #4%$MBVTF ඇެ͕ࣜͩ׆ൃʹ։ൃ 5XJUUFS HJUIVCDPNEHIVCCMFHPUXJUUFS .*5 ݩ5XJUUFSࣾһ͕։ൃ ,JOUPOF HJUIVCDPNLJOUPOFHPLJOUPOF #4%$MBVTF ެ͕ࣜͩόʔδϣϯ͕Wࢭ·Γ 4BMFTGPSDF ྑ͍΋ͷ͕ͳ͍ͷͰࣗྗͰ࡞Ζ͏ʂ #PY ྑ͍΋ͷ͕ͳ͍ͷͰࣗྗͰ࡞Ζ͏ʂ

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ϥΠϒϥϦࣗ࡞   ϋϯζΦϯ

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ϥΠϒϥϦࣗ࡞ͷྲྀΕ (JU)VCʹϦϙδτϦΛ࡞੒͢Δ (01"5)TSDҎԼͷద੾ͳύεԼͰϞδϡʔϧΛ૊ΈཱͯΔ HPNPEΛ࡞੒͢Δ HJUͷόʔδϣϯλάΛ෇͚Δ (JU)VCʹϓογϡ ׬੒ɺQLHHPEFWͰࣗ෼ͷϥΠϒϥϦΛνΣοΫ

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஫ҙ w ͜ͷखॱͰ͸ݸਓͷ(JU)VCΞΧ΢ϯτ಺ʹύ ϒϦοΫϦϙδτϦΛ࡞੒͠·͢ w ύϒϦοΫϦϙδτϦΛ࡞੒ͨ͘͠ͳ͍৔߹͸ ϓϥΠϕʔτϦϙδτϦͱ͢Δ͜ͱ΋ՄೳͰ͢ ͕ɺͦΕΛผͷϓϩάϥϜ͔ΒJNQPSU͢Δҝ ͷखॱͷઆ໌͸ׂѪ͠·͢

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45&1ϦϙδτϦͷ࡞੒ IUUQTHJUIVCDPNOFX   ʹΞΫηε͠ɺҎԼΛೖྗ 0XOFS ࣗ෼ͷΞΧ΢ϯτ 3FQPTJUPSZ/BNF TIVLVKJUTVHP %FTDSJQUJPO ྫ ಺ֳ෎΢ΣϒαΠτ͔Βॕ೔$47Λऔ ಘͯ͠ϓϩάϥϜͰར༻͠΍͘͢͠·͢ 1VCMJD1SJWBUF 1VCMJD "EEB3&"%.& fi MF ☑ νΣοΫ "EEHJUJHOPSF ☑UFNQMBUF(P $IPPTFBMJDFOTF #4%$MBVTF

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45&1ϦϙδτϦͷෳ੡ 74$PEFΛ։͖ʮΑ͏ͦ͜ʯը໘Λදࣔͤ͞·͢   ϝχϡʔͷ<ϔϧϓ><Α͏ͦ͜>Ͱݺͼग़͠Մೳ ʮ(JUϦϙδτϦͷΫϩʔϯʜʯΛΫϦοΫ͠·͢ ೖྗ૭ʹ͋Δʮ(JU)VC͔Βෳ੡ʯΛબ୒͠·͢ ʮ(JU)VCϢʔβʔTIVLVKJUTVHPʯͱλΠϓ͠ɺબ୒͠·͢ ʮϗʔϜσΟϨΫτϦTSDHJUIVCDPNʯʹʮ(JU)VCϢʔβʔʯͷϑΥϧμ Λ࡞Γ·͢ ࡞ͬͨϑΥϧμʹೖͬͯʮϦϙδτϦͷ৔ॴΛબ୒ʯϘλϯΛΫϦοΫ͠·͢ μΠΞϩά͕ग़ΔͷͰʮ৽͍͠΢Οϯυ΢Ͱ։͘ʯϘλϯΛΫϦοΫ͠·͢

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45&1HPNPEJOJU ద౰ͳϑΝΠϧ 3&"%.&NEͳͲ ΛӈΫ ϦοΫͯ͠ʮ౷߹λʔϛφϧΛ։͘ʯΛબ୒͠ ·͢ ʮHPNPEJOJUʯʻ&OUFSʼΛೖྗ͠·͢ ΤΫεϓϩʔϥʔ͔Βʮ৽͍͠ϑΝΠϧʯΞΠί ϯΛΫϦοΫ͠ʮTIVLVKJUTVHPʯΛ࡞੒͠·͢

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45&1࣮૷ͦͷ // Package shukujitsu ͸಺ֳ෎͕ఏڙ͍ͯ͠Δॕ೔Ұཡ CSV ϑΝΠϧΛऔಘɾղੳ͠·͢ɻ package shukujits u // import লུ.. . // Entry ͸ॕ೔1೔෼ͷ৘ใΛอ࣋͢Δߏ଄ମͰ͢ɻ type Entry struct { YMD strin g Name strin g } const csvURL = "https://www8.cao.go.jp/chosei/shukujitsu/syukujitsu.csv " // AllEntries ͸಺ֳ෎΢ΣϒαΠτ͔Βॕ೔ CSV Λऔಘͯ͠ Entry εϥΠεʹม׵͠·͢ɻ func AllEntries() ([]Entry, error) { resp, err := http.Get(csvURL ) if err != nil { return nil, fmt.Errorf("઀ଓʹࣦഊ͠·ͨ͠: %w", err ) } defer resp.Body.Close( ) body, err := io.ReadAll(resp.Body ) if err != nil { return nil, fmt.Errorf("σʔλͷऔಘʹࣦഊ͠·ͨ͠: %w", err ) } // TOD O }

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45&1࣮૷ͦͷ JNQPSUʹҎԼͷߦΛ௥Ճ͠·͢ "golang.org/x/text/encoding/japanese " "golang.org/x/text/transform " ઌఔͷʮ50%0ʯΛҎԼʹஔ͖׵͑·͢ records, err := csv.NewReader(transform.NewReader(bytes.NewReader(body), japanese.ShiftJIS.NewDecoder())).ReadAll( ) if err != nil { return nil, fmt.Errorf("σʔλͷղੳʹࣦഊ͠·ͨ͠: %w", err ) } var entries []Entr y for i, row := range records { if i == 0 { continue // ϔομʔߦΛεΩοϓ } if len(row) != 2 { return nil, fmt.Errorf("૝ఆ֎ͷσʔλʹૺ۰͠·ͨ͠: ߦ %d = %v", i+1, row ) } entries = append(entries, Entry{YMD: row[0], Name: row[1]} ) } return entries, nil

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45&1֬ೝ ౷߹λʔϛφϧͰʮHPNPEUJEZʯʻ&OUFSʼΛ࣮ߦ͠·͢ ʮDNEEFNPʯϑΥϧμΛ࡞੒͠ʮNBJOHPʯΛ࡞੒ɺҎԼΛೖྗ͠·͢ ίʔυ͸ʮHPSVODNEEFNPNBJOHPʯͰ࣮ߦͰ͖·͢ package mai n // import লུ.. . func main() { entries, err := shukujitsu.AllEntries( ) if err != nil { panic(err ) } for _, e := range entries { fmt.Printf("%s = %s\n", e.YMD, e.Name ) } }

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45&1(JU)VC΁൓ө 74$PEFͷιʔε؅ཧλϒͰશͯͷมߋΛεςʔδ ͠ίϛοτ͠·͢ ϝοηʔδ͸ద౰ <ʜ>Ϙλϯ͔Β<λά><λάΛ࡞੒>Λબ୒͠·͢ ʮWʯͱೖྗ͠ʻ&OUFSʼɺଓ͘ϝοηʔδೖྗ ͸ۭཝͷ··ʻ&OUFSʼͱ͠·͢ ը໘ࠨԼͷϒϥϯν໊ͷӈʹ͋Δมߋͷಉظද͔ࣔ Βϓογϡ͠·͢ ϝχϡʔͷ<දࣔ><ίϚϯυύϨοτ>Λ։͖ɺ ʮ(JU1VTI5BHTʯʻ&OUFSʼ 2 4

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45&1QLHHPEFW ϒϥ΢βͰQLHHPEFWΛ։͖ʮHJUIVCDPN(JU)VCϢʔ βʔ໊TIVLVKJUTVHPʯΛೖྗɺ<4FBSDI>ΛΫϦοΫ͠·͢ ݁Ռ͕ͳ͍ࢫදࣔ͞Ε·͕͢ɺσʔλऔಘϦΫΤετ༻ϦϯΫ ͕͋ΔͷͰΫϦοΫ͠·͢ <3FRVFTU>ͱॻ͔ΕͨϦϯΫΛΫϦοΫ͠·͢ 1 2 3

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࿅श

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࿅श՝୊ w ࿅श՝୊<ϑΥϧμ໊EBZUSJBM> w ઌఔ࡞ͬͨTIVLVKJUTVHPϥΠϒϥϦΛJNQPSU͠ɺࠓ೥ ͷॕ೔ΛҰཡදࣔ͢ΔϓϩάϥϜΛॻ͍͍ͯͩ͘͞ w ࿅श՝୊<ϑΥϧμ໊EBZUSJBM> w ϥΠϒϥϦͷ&OUSZߏ଄ମʹJOUͷ:FBS .POUI %BZͷ ֤ϑΟʔϧυΛ௥Ճ͠ɺ஋Λ٧Ίͨ৽͍͠όʔδϣϯΛϦ Ϧʔε͍ͯͩ͘͠͞ w 5*1਺஋΁ͷม׵ʹ͸strconv.Atoi()͕ศརͰ͢

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ίʔυΛॻ͖ऴ͑ͨΒ w ʮϢʔβʔ໊QSBDUJDFʯϒϥϯνͰ࡞ۀ͍ͯ͠Δ͜ͱΛ֬ೝ͍ͯͩ͘͠͞ w 74$PEFͷҰ൪ࠨԼʹදࣔ͞Ε͍ͯ·͢ w มߋΛεςʔδ͠ɺίϛοτ͍ͯͩ͘͠͞ w 74$PEFͷࠨϝχϡʔͷʮιʔε؅ཧʯ͔Βૢ࡞ w ίʔυΛ(JU)VCʹϓογϡ͍ͯͩ͘͠͞ w 74$PEFͷҰ൪ࠨԼͷϒϥϯν໊ͷ͙͢ӈʹ͋ΔΞΠίϯ͔Βૢ࡞ ্ਤ w ϓϧϦΫΤετΛ࡞੒͍ͯͩ͘͠͞ w ʮιʔε؅ཧʯͷ্෦ʹΞΠίϯ͕͋Γ·͢

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࣍ճ༧ࠂ w ࣍ճ͸ʮ)FSPLV(Pೖ໳ʯͰ͢ w )FSPLVͷΞΧ΢ϯτΛ·͍ͩ࣋ͬͯͳ͍ํ͸ TJHOVQIFSPLVDPN͔Βొ࿥Λ͓ئ͍͠·͢ w ෼͔Βͳ͔ͬͨͱ͜Ζ΍࣭໰ͳͲ͸ɺࣾ಺4MBDL HPQIFSTνϟϯωϧʹ౤ߘ͍ͩ͘͞ w ຊ೔ͷ಺༰ΛΑΓਂ͘ཧղ͍ͨ͠ํ͸ɺڭՊॻͷ ୈষΛಡΜͰΈ͍ͯͩ͘͞