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Reader Conditionals
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ayato
June 26, 2015
Programming
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Reader Conditionals
ayato
June 26, 2015
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Transcript
3FBEFS$POEJUJPOBMT ΆʔͨͿΔͳ͜ʔͲΛ͔͘ !@BZBUP@Q ͋ͽʔ DMPKVSF@GPDVT
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ͷ͜ͱ EFG!@BZBUP@Q \OBNFl͋ͽʔz MBOH<$MPKVSF3VCZ+BWB4DSJQU4DIFNF> CMPHl EFpOFBZBMPHb z DPNQBOZl$ZCP[V4UBSUVQT *ODz^
ͷ͜ͱ EFG!@BZBUP@Q \OBNFl͋ͽʔz MBOH<$MPKVSF3VCZ+BWB4DSJQU4DIFNF> CMPHl EFpOFBZBMPHb z DPNQBOZl$ZCP[V4UBSUVQT *ODz^ ͍͍ͩͨ$MPKVSFͷਓ
DMKD࢝Ί·ͨ͠
DMKD࢝Ί·ͨ͠ d
࣍ w Ҏલͷ w 3FBEFS$POEJUJPOBMT֓ཁ w ৄࡉ w কདྷͷ͜ͱ w
࣮ࡍʹͬͯΈͨ w ·ͱΊ
Ҏલͷ
5IFSFBSF$MPKVSFEJBMFDUT $MPKVSF $MPKVSF4DSJQU $MPKVSF$-3 IPTUFEPOTFWFSBM EJ⒎FSFOUQMBUGPSNT8FXJTIUPXSJUFMJCSBSJFT UIBUDBOTIBSFBTNVDIQPSUBCMFDPEFBT QPTTJCMFXIJMFMFBWJOHqFYJCJMJUZUPQSPWJEF QMBUGPSNTQFDJpDCJUTBTOFFEFE
UIFOIBWF UIJTDPEFSVOPOBMMPGUIFN IUUQEFWDMPKVSFPSHEJTQMBZEFTJHO3FBEFS $POEJUJPOBMT
5IFSFBSF$MPKVSFEJBMFDUT $MPKVSF $MPKVSF4DSJQU $MPKVSF$-3 IPTUFEPOTFWFSBM EJ⒎FSFOUQMBUGPSNT8FXJTIUPXSJUFMJCSBSJFT UIBUDBOTIBSFBTNVDIQPSUBCMFDPEFBT QPTTJCMFXIJMFMFBWJOHqFYJCJMJUZUPQSPWJEF QMBUGPSNTQFDJpDCJUTBTOFFEFE
UIFOIBWF UIJTDPEFSVOPOBMMPGUIFN IUUQEFWDMPKVSFPSHEJTQMBZEFTJHO3FBEFS $POEJUJPOBMT ϓϥοτϑΥʔϜຖʹ ಉ͡ίʔυΛॻ͖ͨ͘ͳ͍
ղܾࡦ CFGPSF w ίϐʔϖʔετ w MFJODMKTCVJMEDSPTTPWFST w DMKY
ίϐʔϖʔετ ʊਓਓਓਓਓਓਓਓਓਓਓਓʊ ʼɹԿղܾ͞Ε͍ͯͳ͍ɹʻ ʉ:?:?:?:?:?:?:?:?:?:?:ʉ
MFJODMKTCVJMEDSPTTPWFS w ໊લ͚ͩແବʹΧοί͍͍ w ίʔυͷڞ௨Խ͕ग़དྷΔΑ͏ʹͳͬͨ w ϓϥοτϑΥʔϜґଘͷίʔυڞ༗ग़དྷͳ͍ w 'MPBUQBSTF'MPBUlz ͜Εແཧ
DMKY w ϓϥοτϑΥʔϜґଘΛΓग़ͤΔ w DMKTDMKͷίʔυΛు͖ग़͢ w TSDUPTSDίϯύΠϥ w αʔυύʔςΟͳπʔϧͳͷ͕Πέͯͳ͍
৽͍͠ղܾࡦ
৽͍͠ղܾࡦ 3FBEFS$POEJUJPOBMT
3FBEFS$POEJUJPOBMT ֓ཁ
3FBEFS$POEJUJPOBMT w ϓϥοτϑΥʔϜʹ໊લ͕͍ͨDMK DMKT DMS w 3FBEFSTZOUBYͷՃ ! w
ϓϥοτϑΥʔϜ໊Ҏ֎ʹEFGBVMU͕͑Δ w SFBESFBETUSJOHʹΦϓγϣϯՃ w SFBEFSDPOEJUJPOBMTͷΠϯελϯεՃ w DMKD֦ுࢠͷαϙʔτ
ཁ͢Δͱʜ w ϦʔμʔϚΫϩ w ΫϩείϯύΠϧ͢Δͭ w ศར
ৄࡉ
'FBUVSF4FUT w ݱࡏ͑ΔͷͭͷϓϥοτϑΥʔϜ w DMK DMKT DMS w ಡΈࠐΈ࣌ʹৗʹQMBUGPSNGFBUVSF༗ޮ w
EFGBVMU OPOF FMTF༧ࡁΈͷ໊લ
3FBEFSTZOUBY w !͕৽͘͠Ճ͞Εͨ w ಉ͡จ๏ͰTQMJDJOHͷ༗ແ͕ҧ͍ w GFBUVSFDPOEJUJPOFYQSFTTJPO
w EFGBVMUΛ͏͜ͱͰʮͦΕΒҎ֎ʯΛදݱՄ w Ϛον͠ͳ͍߹Կฦ͞ͳ͍ OPUOJM
3FBEFSTZOUBY OTFYBNQMFDPSF SFRVJSF ! DMK<<GPPCBSBTCBS>> DMKT<<IPHFGVHBBTGVHB> <UBUBUJUJBTUJUJ> EFGOTUSJOU<Y>
DMK *OUFHFSQBSTF*OUY DMKT QBSTF*OUKTXJOEPXY
3FBEFSPQUJPOTBOE QSFTFSWFSFBEDPOENPEF w SFBESFBETUSJOHͷୈҰҾͱͯ͠Φϓγϣϯ ϚοϓΛͤΔΑ͏ʹͳͬͨ w SFBEFSDPOEJUJPOBMTΛॲཧ͢Δ͔બՄ w ΞΫςΟϒʹ͢ΔϓϥοτϑΥʔϜΛબՄ
3FBEFSPQUJPOTBOE QSFTFSWFSFBEDPOENPEF SFBETUSJOH\SFBEDPOEBMMPX^ l DMKDMPKVSFEFGBVMUVOLOPXO z JO$MPKVSFDMPKVSF EFGY SFBETUSJOH\SFBEDPOEQSFTFSWF^
l DMKDMPKVSFEFGBVMUVOLOPXO z DMKDMPKVSFEFGBVMUVOLOPXO DMBTTY DMPKVSFMBOH3FBEFS$POEJUJPOBM
3FBEDPOEJUJPOBMBOE UBHHFEMJUFSBMJOTUBODFT w SFBEFSDPOEJUJPOBMTͱUBHHFEMJUFSBM༻ͷΠ ϯελϯε͕૿͑ͨ
/FXQPSUBCMFpMF FYUFOTJPODMKD w ֤ϓϥοτϑΥʔϜ͔ΒಡΈࠐΉ͜ͱ͕ग़དྷΔ w ϓϥοτϑΥʔϜݻ༗ϑΝΠϧDMKDΑΓઌʹ ಡΈࠐ·ΕΔ w DMKDͷωʔϜεϖʔεΛແޮʹͰ͖Δ
কདྷͷ͜ͱ
কདྷͷ͜ͱ w 0QFOGFBUVSFTFU w %FGBVMUEBUBSFBEFSGPSUBHHFESFBEFS JOTUBODFT w #PPMFBOGFBUVSFDPNCJOBUJPOT w 0QFOFYUFOUJPOT
࣮ࡍʹͬͯΈͨ
ͬͯΈͨ w ϙʔλϒϧͳίʔυΛॻ͚Δ w ϥΠϒϥϦ͚ͩͰͳ͘ϓϩμΫτͷதͰ͍ ͍ͨγʔϯ͋Δ w ϧʔςΟϯάपΓͱ͔
ͬͯΈͨ w ϙʔλϒϧͳίʔυΛॻ͚Δ w ϥΠϒϥϦ͚ͩͰͳ͘ϓϩμΫτͷதͰ͍ ͍ͨγʔϯ͋Δ w ϧʔςΟϯάपΓͱ͔ جຊతʹศར
ߟ͑Δඞཁ͕͋Δ͜ͱ w ϑΝΠϧԿॲஔ͘ w ϚΫϩͲ͏͢Δ w ϓϥοτϑΥʔϜຖʹ͑Δͷ͑ͳ͍ͷ w
Ϧϩʔυʹؔͯ͋͠Γ
ϑΝΠϧԿॲஔ͘ w ׳शతʹTSDDMKDPSTSDDMKD w DMKYͬͨϥΠϒϥϦͩͱTSDԼ͕ଟ͍ؾ͕ ͢Δ w ߹ʹΑͬͯDMKTԼ͋Γ͔ ϚΫϩ༻
ϚΫϩͲ͏͢Δ w ϚΫϩఆٛDMKͰғΉ w ωʔϜεϖʔεNBDSPTͬͯ͏͍Βͳ͍͔ w FH TSDDMKTFY\GPPDMKT GPPDMKD^Ͱྑ͛͞
ϓϥοτϑΥʔϜຖʹ ͑Δͷ͑ͳ͍ͷ w EFGNBDSPΈ͍ͨͳͷDMKTͰແཧ w SFRVJSFJNQPSUDMKDDMKYͰͳ͚Εϓϥο τϑΥʔϜຖʹ۠Δ w DMKYͷϥΠϒϥϦී௨ʹSFRVJSFJNQPSUग़ དྷΔ
Ϧϩʔυʹؔͯ͋͠Γ w IUUQEFWDMPKVSFPSHKJSBCSPXTF5/4 w Ұिؒલʹղܾ͞Εͨ UPPMTOBNFTQBDF
&OKPZ$MPKVSF