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Video: Yuav suav li cas cyclomatic complexity?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cyclomatic complexity yog qhov chaw code nyuaj kev ntsuas uas raug correlated rau ib tug xov tooj ntawm coding yuam kev. Nws yog xam los ntawm kev tsim lub Control Flow Graph ntawm cov cai uas ntsuas tus naj npawb ntawm linearly-independent paths los ntawm ib qho kev pab cuam module.
Tsis tas li ntawd, McCabe's cyclomatic complexity xam tau li cas?
Yuav ua li cas xam Cyclomatic Complexity (McCabe)
- P = tus naj npawb ntawm qhov cuam tshuam ntawm cov kab hluav taws xob ntws (piv txwv li kev hu xov tooj thiab cov txheej txheem subroutine)
- E = tus naj npawb ntawm ntug (hloov tswj)
- N = tus naj npawb ntawm cov nodes (ib pawg ntawm cov nqe lus uas tsuas muaj ib qho kev hloov ntawm kev tswj)
Tsis tas li ntawd, cyclomatic complexity yog dab tsi thiab vim li cas nws tseem ceeb? Testability thiab kev ruaj ntseg yog tseem ceeb vim lawv siv sij hawm feem ntau nyob rau hauv txoj kev loj hlob lub neej voj voog ntawm cov khoom. Cyclomatic complexity feem ntau yog siv los ntsuas qhov nyuaj nyob rau hauv chav kawm lossis theem txheej txheem.
Tsis tas li ntawd, yuav ua li cas yog code complexity xam?
Xyoo 1976, Thomas McCabe Snr tau npaj ib qho kev ntsuas rau kev xam code complex , hu ua Cyclomatic nyuaj . Nws txhais tau tias: A quantitative ntsuas ntawm tus naj npawb ntawm linearly ywj siab txoj hauv kev los ntawm ib qho kev pab cuam qhov chaw code … suav nrog kev tswj cov kab hluav taws xob ntawm qhov kev pab cuam.
Dab tsi yog qhov qhab nia zoo cyclomatic complexity?
Rau feem ntau niaj hnub, a cyclomatic complexity hauv qab no 4 yog xam zoo ; a cyclomatic complexity nruab nrab ntawm 5 thiab 7 yog suav tias yog nruab nrab nyuaj , ntawm 8 thiab 10 yog siab nyuaj , thiab saum toj no yog heev nyuaj.
Pom zoo:
Tus lej cyclomatic suav li cas?
Cyclomatic complexity yog qhov kev ntsuas qhov ntsuas qhov nyuaj uas cuam tshuam nrog ntau qhov yuam kev coding. Nws yog xam los ntawm kev tsim lub Control Flow Graph ntawm cov cai uas ntsuas tus naj npawb ntawm linearly-independent txoj kev los ntawm ib qho kev pab cuam module
Puas suav muaj nuj nqi suav null nqi?
Piv txwv - COUNT Function tsuas suav nrog TSIS NULL Qhov Tseem Ceeb Tsis yog txhua tus paub qhov no, tab sis COUNT txoj haujlwm tsuas yog suav cov ntaub ntawv uas qhov kev qhia tsis yog NULL hauv COUNT(qhia). Thaum cov lus qhia yog tus nqi NULL, nws tsis suav nrog COUNT suav
Yuav ua li cas sib koom ua ke complexity xam?
2 Teb. Kev sib faib ntawm ib lub node A[L,R] mus rau hauv ob lub nodes siv R − L + 1 lub sij hawm thiab ces muab ob tug me nyuam nodes A[L,M] thiab A[M+1,R] dua yuav siv A[R−L. +1] lub sijhawm. Yog li rau txhua qhov node, tus naj npawb ntawm kev ua haujlwm algorithm ua tau yog sib npaug li ob npaug ntawm qhov loj ntawm cov array sib thooj rau cov node
Yuav ua li cas koj xam qhov complexity?
Qhov Chaw Pabcuam: yog qhov chaw ib ntus (tsis suav nrog qhov loj me) faib los ntawm koj lub algorithm los daws qhov teeb meem, hais txog qhov loj me. Qhov chaw complex muaj xws li ob qho tib si Auxiliary qhov chaw thiab qhov chaw siv los ntawm cov tswv yim. Space Complexity = Input Size + Auxiliary space
Kev suav suav VBA yog dab tsi?
Cov chav kawm VBA: kev suav suav. Raws li Michael Rutten's Hidden Gems pub dawb, lub khw muag khoom Visual Basic tsis tu ncua yog siv suav ntawm qhov chaw nco tom qab nws tus taw qhia VTable