Yuav ua li cas yog lub zwj ceeb neeg teb xov tooj?

Nyob rau hauv lub cajmeem, nws yog ib qho tseem ceeb tsis tau tsuas yog txawj hais lus, tab sis kuj yog ib tug to taub txog dab tsi yog lub luag hauj lwm rau dab tsi. Nws yog tsim nyog rau cov tau muaj kev vam meej sib koom tes, thiab tsis pub dhau lub tsab xov xwm koj yuav nrhiav tau tawm yog dab tsi tus neeg tsav tsheb ib puag ncig, yog vim li cas nws yuav tsum tau, dab tsi yog qhov nta. Muaj Tseem yuav kawm txog nyob rau hauv nqe lus dav dav hloov thiab lub branching code, thiab rau cov uas nws yog thov.

Yuav ua li cas yog lub zwj ceeb neeg teb xov tooj?

Yog li ntawd (los yog, hloov, ib tug nyob ntawm ceg qhia) yog hu ua ib tug programming lus tsim. Nws muab kev ua tau zoo ntawm ib pab neeg los yog ib pawg. Tab sis qhov no yog tau tsuas yog thaum lub cai mob txog qhov tseeb ntawm ib tug tej yam zajlus kom qhia los yog tau txais cov lus qhia los ntawm tus neeg siv (khoom neeg teb xov tooj) nyob rau hauv lub embodiment.

General piav qhia ntawm daim ntawv thov

nqe lus no yog siv thaum ua tau zoo los yog uas raug nqi ntau yam txheej commands (txib tsawg) yog nyob ntawm seb puas muaj yog ua lub txiav txim yam. Nws kuj yuav siv tau nrog ib tug saib kom branching. Nws yog ib tug ntawm peb tej designs, uas yog siv nyob rau hauv kev programming.

conditional ceg daim ntawv

Thawj peb digress ib tug me ntsis thiab nco ntsoov nrov heev paintings Vasnetsov Victor Mikhailovich, "Knight ntawm lub Crossroads", sau nyob rau hauv 1878. Nws cim ib tug hero uas sawv ntawm ib tug kev tshuam thiab txiav txim siab mus rau qhov twg. Ib yam li ntawd, tus neeg teb xov tooj ua hauj lwm lub conditioned. Yog li ntawd, yog hais tias tus tub rog yuav txais qhov kev mus nyob rau hauv ib tug coj, tab sis nws yuav mus nyob rau hauv tib lub ceg. Cov kev xaiv yuav ua tau tsuas yog ib tug. Yog hais tias peb tham txog lub zwj ceeb neeg teb xov tooj, ces nws ua hauj lwm tsuas yog thaum nws cov zajlus kom qhia yog "muaj tseeb". Feem ntau cov programming lus rau xaiv nws siv lub lo lus tseem ceeb tias. Tej zaum qhov kev tsim kho theem, thaum soj ntsuam ua ntej ib tug mob, ces lwm, ces ib feem peb, ib tug peb lub hlis twg, thiab hais txog. Cia saib no nyob rau hauv ntau yam. Yuav ua li cas yog cov ntau yam ntaub ntawv ntawm conditional nqe lus? Tag nrho peb ntawm lawv:

1. Nqe lus, nyob rau hauv uas muaj yog tsuas yog ib ceg. Nws zoo nkaus li zoo (sim) raws li nram no: yog hais tias tus tsim nyog tej yam kev mob no ces ua los ntawm pab neeg kawg. Lub computer laij cov tsheb, seb cov zajlus kom tus nqi ntawm qhov ntsuas ntawm qhov tseeb. Yog hais tias tus mob yog tib yam nrog cov neeg ntawm lwm qhov chaw ntawm qhov kev pab cuam, nws pib mus rau txim tuag code kom txog thaum lub lo lus tseem ceeb kawg. Nyob rau hauv assembler daim ntawv no ntawm kev ua hauj lwm no tsuas muaj nyob rau lub programmer. Nws kuj yuav xws li hais tias nyob rau hauv lub kawg yuav muaj ib tug tej yam lo lus tseem ceeb, thiab ces koj yuav tsum tau ceev faj tsis txhob attribute dab tsi ntxiv.
2. Nqe lus, nyob rau lub ob ceg tam sim no. Nws zoo raws li nram no: yog hais tias ib tug muab kev mob ces command1 command2 lwm kawg. Siv no programming dlaim nyob rau hauv tus neeg mob qhov twg nws yog tsim nyog hais tias ib tug ntawm cov pab pawg twb tau meej tau. Yog li ntawd, yog hais tias tus mob no yeej muaj tseeb, ces tus thawj ib feem ntawm cov kev cai - yog hais tias tsis yog tus thib ob. Nyob rau hauv tej rooj plaub, xws li ib tug tov uas yuav tsum tau.
3. Conditional neeg teb xov tooj nrog ib tug xov tooj ntawm tej yam kev mob. Nws zoo raws li nram no:
   Yog hais tias tus mob thawj ces yuav ua li cas
   lwm tus yog tias yog tus mob thawj tsis haum, kos nram qab no ces yuav ua li cas
   lwm tus yog tias mus saib tag nrho cov tej yam kev mob ib tug los ntawm ib tug ces yuav ua li cas
   lwm tus yog tias tsis xaiv los ntawm cov saum toj no yog tsis tsim nyog, ces qhov hais kom ua yog khiav kawg

Raws li koj tau pom, lub zwj ceeb neeg teb xov tooj siv ib tug txawv tsim. Lawv siv yuav siv sij hawm qhov chaw sequentially. Hais tias yog tsis tau qhov teeb meem no (ntawm ib txwm txheej txheem), nyob rau hauv uas lub code tiav yuav pib los ntawm lub kawg - yeej ib txwm los ntawm thaum pib.

Piv txwv li "Pascal"

Yuav kom to taub li cas nws ua hauj lwm, peb qhia mus xav txog cov piv txwv ntawm ib qho ntawm feem nrov programming lus. Nqe lus hais nyob rau hauv lub "Pascal" yuav ua tau yooj yim los yog txoj. Tus thawj hom - ib yam ntawm cov cim =, <,>, thiab cov zoo li. Ib tug complex nqe lus nyob rau hauv Pascal yuav coj raws li nram no daim ntawv:

Yog hais tias ib tug> = y
ces
Op: = Sqr (ay)
lwm tus
sau ntawv (Ib invalid tus nqi);

Yuav ua li cas yog ib tug mus?

Yuav ua li cas yog ib tug mus? Feature ntawm nws tsim yog tias nws muaj tsawg kawg yog ob ceg. Tab sis nws muaj peev xwm tsuas yog ua ib tug, yav tas los teem tsis tau hais tias yog xoo tseem ceeb kab zauv. Hais txog sib piv rau cov ua ntej lawm cov lus qhia yuav tsum tau kos koj cov xim rau lub fact tias cov kev kawm tsis rov qab ib tug Boolean nqi, thiab tag nrho cov, raws li zoo raws li lub hom uas tau muab rau nws. Nws kuj yuav nqa tawm nyob rau hauv ib co programming lus, muab piv nrog rau cov ntawv nyeem hlua.

Keeb kwm ntawm txoj kev loj hlob

Keeb xeeb uas siv los ntawm pab neeg IEP, uas qhia qhov kev hloov ntawm lub xam tag. Nws hais qhia, kuj ob leeg raws li ib tug selector, uas rov ib integer, thiab ib co ntawm cov kev hloov cov lus qhia. Hais kom yog tua, lub xam tej nqi, uas yog siv raws li ib daim ntawv lo tooj nyob rau hauv tag nrho daim ntawv ntawm commands rau uas muaj ib tug mus thiab xim ntawm lub tshuab.

Zoo li cov designs yuav pom nyob rau hauv programming hom lus xws li "Basic" thiab "Fortran". Peb tsis tau hais tias lawv yog ho tawm ntawm hnub tim, vim hais tias kom txog rau thaum tam sim no lawv muaj peev xwm khav heev npaum txaus, yog hais tias peb tham nyob rau hauv general txog programming. Nqe lus uas yog siv nyob rau hauv niaj hnub lus, yog ib tug ntau txoj qauv, uas muaj feem xyuam rau kev kawm. Mus rov qab mus rau lub hauv paus pib ntawm cov khoom no, kuv xav ntxiv hais tias rau qhov kev txiav txim ntawm qhov tsim nyog ceg yog tsis tsim nyog rau sequentially txheej txheem thiab muab piv rau cov kev tshwm sim nrog cov kev qhia ntawm lwm yam tseem ceeb. Cia li yuav mus nyob rau cov ntaub ntawv nyob rau hauv lub cim xeeb array ntawm unconditional ceg cov lus qhia, nyob rau hauv uas muaj koj qhov chaw nyob. Thaum ib tug tsim nyog hais tias tsim nyog cov ntaub ntawv tsuas xam. Thiab cov kev ceev ntawm qhov kev pab cuam yuav ywj siab ntawm tus xov tooj ntawm lub cim npe.

Nyob rau hauv niaj hnub programming lus, uas yog dav siv nyob rau lub caij, hloov cov neeg teb xov tooj yuav kuj yuav tsim los ua ib txoj kev hloov cov lus uas muaj lub pawg, uas nqa tawm lub zog ntawm cov xim nyob rau hauv tus tsim nyog daim code tsis txawv tej yam kev mob. Yuav ua li cas yog lawv tsis sawv ntsug rau? Cov high-theem programming lus, nyob rau hauv Feem ntau, siv cov ntaub ntawv lub npe, swithc los yog ob qho tib si.

Properties xam Boolean kab zauv

Ib tug tseem ceeb cawv rau yuav ua li cas qhov kev pab cuam nrog nqe lus yuav tsum tau tua, renders saws nyob rau hauv txhua rooj plaub lub logic le caag ntawm conditional kab zauv. Muaj ob lub ntsiab tswv yim.

1. Sau kom tiav xam. Peb xam tag nrho tsis nrog cov muab qhov tseem ceeb, thiab ces I.
2. Uas ua tsis tiav muab xam. Nyias pom tias txhua txhua kev xaiv. Yog hais tias cov kev qhia ntsuas kom "muaj tseeb", ces tus tom ntej kev xaiv lav. Nws ua nyob rau hauv cov ntaub ntawv ntawm LOS SIS.

xaus

Conditional tswv yog heev tsim los programming. Nrog lawv pab nws yog ua tau yooj yim siv nyuab designs tsis muaj mus xav seb cov txiv neej.