Video: Dab tsi yog kev siv dynamic memory allocation?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Dynamic Memory Allocation . Dynamic memory allocation yog thaum ib tug executing program thov kom lub operating system muab nws ib tug thaiv ntawm lub ntsiab nco . Qhov program ntawd siv qhov no nco rau ib txhia lub hom phiaj . Feem ntau cov lub hom phiaj yog ntxiv cov node rau cov ntaub ntawv qauv.
Tsis tas li ntawd, dynamic memory allocation yog dab tsi?
Dynamic Memory Allocation . Dynamic memory allocation hais txog kev tswj hwm qhov system nco ntawm runtime. Dynamic nco kev tswj hwm hauv C programming lus yog ua los ntawm pawg plaub lub luag haujlwm hu ua malloc(), calloc(), realloc(), thiab free().
Ib sab saum toj no, dab tsi yog qhov kev faib ua lub cim xeeb thiab nws hom? Muaj ob hom ntawm kev faib kev nco . 1) Static kev faib kev nco -- faib los ntawm tus compiler. Qhov loj me thiab hom ntawm nco yuav tsum paub thaum lub sij hawm sau. 2) Dynamic memory allocation -- nco faib thaum lub sijhawm khiav.
Ib sab ntawm qhov no, vim li cas peb thiaj li xav tau dynamic nco faib hauv C?
Peb tuaj yeem ua rau peb qhov kev pabcuam hloov tau yooj yim yog tias, thaum ua tiav, nws tuaj yeem faib ntxiv nco thaum xav tau thiab dawb nco thaum tsis yog xav tau . Kev faib tawm ntawm nco thaum ua tiav yog hu ua dynamic memory faib . C muab cov ntaub ntawv ua haujlwm rau faib thiab dawb nco dynamically thaum lub sijhawm ua haujlwm ntawm qhov program.
dynamically faib txhais li cas?
Dynamic nco faib hauv C/C++ hais txog kev ua lub cim xeeb faib manually los ntawm programmer. Dynamically faib nco yog faib ntawm Heap thiab non-static thiab cov hloov pauv hauv zos tau txais kev nco faib ntawm Stack (Saib Memory Layout C Programs kom paub meej).
Pom zoo:
Dab tsi ntawm cov hauv qab no yog qhov zoo ntawm kev siv cov khoom siv pom kev hauv kev hais lus?
Qhov txiaj ntsig tseem ceeb ntawm kev siv cov khoom siv pom hauv koj cov lus hais yog tias lawv ua kom cov neeg tuaj saib muaj kev txaus siab, hloov kev mloog ntawm tus neeg hais lus, thiab ua rau tus neeg hais lus muaj kev ntseeg siab ntau dua hauv kev nthuav qhia tag nrho
Dab tsi yog qhov sib txawv loj ntawm kev txheeb xyuas qhov yuam kev thiab kev kho cov lej yuam kev?
Ob qhov kev tshawb nrhiav qhov yuam kev thiab kev kho qhov yuam kev yuav tsum muaj qee qhov ntawm cov ntaub ntawv rov qab xa mus nrog cov ntaub ntawv tiag tiag; kev kho yuav tsum muaj ntau tshaj li kev tshawb nrhiav. Parity bits yog ib txoj hauv kev yooj yim rau kev tshawb nrhiav qhov yuam kev. Ib qho parity me ntsis yog ib qho ntxiv me ntsis xa nrog cov ntaub ntawv uas tsuas yog 1-ntsis suav ntawm cov ntaub ntawv
Dab tsi yog qhov txawv ntawm cov neeg siv kev paub thiab kev paub ntawm cov neeg siv khoom?
User Experience (UX) cuam tshuam nrog tib neeg cuam tshuam nrog koj cov khoom thiab cov kev paub uas lawv tau txais los ntawm kev sib cuam tshuam. Customer Experience (CX), incontrast, encompasses tag nrho cov kev sib cuam tshuam ib tug neeg muaj nrog koj hom
Dab tsi yog qhov kev txwv kev ncaj ncees piav qhia txog kev ncaj ncees lossis kev txwv txawv teb chaws?
Kev lees paub ncaj ncees xav kom tus yuam sij txawv teb chaws yuav tsum muaj tus yuam sij tseem ceeb sib xws lossis nws yuav tsum yog null. Qhov kev txwv no tau teev tseg ntawm ob lub rooj (niam txiv thiab menyuam); nws tuav cov ntawv xov xwm ntawm kab hauv cov rooj no. Nws txhais tau hais tias kev siv los ntawm kab hauv ib lub rooj mus rau lwm lub rooj yuav tsum siv tau
Dab tsi yog qhov tseem ceeb ntawm kev siv kev coj ncaj ncees rau cov ntaub ntawv kev ruaj ntseg?
Rau cov kws tshaj lij kev ruaj ntseg cov ntaub ntawv, muaj ob lub hom phiaj tseem ceeb thaum nws los txog rau cov ntaub ntawv tseem ceeb: tiv thaiv nws thiab paub txog nws qhov chaw. Cov koom haum tsis tuaj yeem xav tias cov ntaub ntawv raug cai lossis tau txais los ntawm kev coj ncaj ncees