Video: Dab tsi yog qhov int hauv C#?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
C# txhawb nqa ib leeg- thiab ntau qhov arrays ntawm txhua yam. Piv txwv li, int ? yog hom uas tuaj yeem tuav tau 32-ntsis tus lej los yog tus nqi null. C# tus hom system yog kev sib koom ua ke xws li tus nqi ntawm txhua yam tuaj yeem kho raws li ib qho khoom.
Ib yam li ib tug yuav nug, dab tsi yog qhov int hauv C#?
yog hom uas tuaj yeem tuav tau 32-ntsis tus lej los yog tus nqi null. Txhua yam hauv C# ncaj qha los yog indirectly muab los ntawm hom hom khoom, thiab cov khoom yog qhov kawg hauv chav kawm ntawm txhua hom.
Qhov thib ob, qhov ntev int hauv C yog dab tsi? ntev int . kos npe ntev . kos npe ntev int . Ntev kos npe tus lej hom. Muaj peev xwm muaj tsawg kawg yog [−2, 147, 483, 647, +2, 147, 483, 647] ntau yam; yog li, nws yog tsawg kawg yog 32 me me.
Hais txog qhov no, txhais li cas los ntawm INT?
Int , luv rau "integer," yog ib hom kev hloov pauv tseem ceeb ua rau hauv lub compiler thiab siv los txhais cov lej sib txawv uas tuav tag nrho cov lej. Lwm cov ntaub ntawv muaj xws li ntab thiab ob npaug. C, C ++, C# thiab ntau lwm yam lus programming paub int raws li hom ntaub ntawv.
Qhov txawv ntawm int thiab int * yog dab tsi?
Java ob int thiab Integer yog siv los khaws cov ntaub ntawv hom integer qhov loj qhov sib txawv ntawm ob leeg yog hom int yog primitive thaum Integer yog hom chav kawm. Ntawm qhov tod tes, Integer yog ib chav wrapper uas wraps hom primitive int rau hauv ib yam khoom.
Pom zoo:
Dab tsi yog qhov dav thawj qhov kev tshawb nrhiav thiab qhov tob thawj qhov kev tshawb fawb?
BFS sawv rau Breadth First Search. DFS sawv cev rau Kev Tshawb Nrhiav Qhov tob. 2. BFS (Breadth First Search) siv Queue cov qauv ntaub ntawv los nrhiav txoj hauv kev luv tshaj. BFS tuaj yeem siv los nrhiav ib qhov chaw luv tshaj plaws hauv cov duab tsis hnyav, vim tias hauv BFS, peb mus txog qhov kawg uas muaj qhov tsawg kawg nkaus ntawm cov npoo los ntawm qhov chaw vertex
Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm
Dab tsi yog qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov ntsuas thib ob?
Primary index: nyob rau hauv ib tug sequentially order file, qhov Performance index uas nws search key qhia cov sequential order ntawm cov ntaub ntawv. Kuj hu ua clustering index. Secondary index: ib qho Performance index uas nws qhov tseem ceeb tshawb nrhiav qhia qhov kev txiav txim sib txawv ntawm qhov kev txiav txim ntawm cov ntaub ntawv. Kuj hu ua non-clustering index