Puas c++ muaj qhov pib pib?

2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38

C yeej ib txwm hais meej heev txog qhov pib qhov tseem ceeb ntawm cov khoom. Yog tias ntiaj teb lossis zoo li qub, lawv yuav raug xoom. Yog auto, tus nqi yog indeterminate. Qhov no yog qhov teeb meem hauv pre-C89 compilers thiab tau teev tseg los ntawm K&R thiab hauv DMR tus thawj C daim ntawv qhia.

Puas muaj qhov pib pib pib hauv C?

Tsis zoo li qee cov lus programming, C/C ++ tsis pib feem ntau hloov pauv rau tus nqi muab(xws li xoom) tau txais. Yog li thaum qhov sib txawv tau muab lub cim xeeb qhov chaw los ntawm lub compiler, lub neej ntawd tus nqi ntawm qhov sib txawv yog dab tsi (khoom khib nyiab) tus nqi tshwm sim rau twb nyob rau hauv qhov chaw nco!

Dab tsi yog qhov pib pib ntawm ib qho array hauv C?

Piv txwv li, tus lej array yog pib los ntawm 0. Ob npaug thiab ntab qhov tseem ceeb yuav pib nrog 0.0. Rau char arrays, tus nqi pib yog '\0'. Rau ib qho array ntawm pointers, tus nqi pib yog nullptr.

Puas dynamic pib ua tau hauv C?

Dynamic initialization of object in C++

Dynamic initialization of object refers to initializing the objects at a run time i.e., tus nqi pib ntawm ib yam khoom yog muab thaum lub sij hawm khiav sijhawm. Nws tuaj yeem ua tiav los ntawm kev siv cov neeg tsim khoom thiab los ntawm kev hla tsis dhau mus rau tus tsim.

Qhov kev hloov pauv twg tau pib pib ua haujlwm hauv C?

Kev hloov pauv thoob ntiaj teb tau pib pib rau 0 thaum lub sijhawm tshaj tawm. Kev hloov pauv thoob ntiaj teb feem ntau yog sau ua ntej lub luag haujlwm tseem ceeb. Hauv kab 4, a thiab b tau tshaj tawm tias yog ob lub ntiaj teb sib txawv ntawm hom int.