Qhov twg siv const hauv c ++?

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

Tus tsim nyog const tuaj yeem yog siv rau kev tshaj tawm ntawm txhua qhov sib txawvtxhawm rau qhia tias nws tus nqi yuav tsis hloov pauv (uas yog nyob ntawm qhov chaw sib txawv ntawm qhov chaw khaws cia, peb tuaj yeem hloov pauv. tus nqi ntawm const variable los ntawm kev siv pointer).

Thaum twg yuav tsum siv const hauv C?

Cov lus tseem ceeb tso cai koj qhia seb puas yog qhov hloov pauv tau hloov pauv tau. Koj tuaj yeem siv const los tiv thaiv kev hloov pauv rau qhov sib txawv thiab const pointers thiab const references tiv thaiv kev hloov cov ntaub ntawv taw qhia rau (los yog siv).

Vim li cas peb thiaj siv const?

Ib txoj haujlwm dhau los ua const thaum lo lus tseem ceeb const siv rau hauv cov haujlwm tshaj tawm. Lub tswv yim ntawm const functions yog tsis tso cai rau lawv hloov cov khoom uaslawv hu. Nws raug pom zoo rau kev xyaum ua kom muaj ntau txoj haujlwm const raws li qhov ua tau kom tsis txhob muaj kev hloov pauv rau cov khoom raug zam.

siv cov kev tsim nyog tas li nyob qhov twg?

Thaum peb tsis xav hloov qhov kev sib cav thiab dhau nws raws li kev siv lossis pointer, peb siv const qualifier kom qhov kev sib cav tsis txhob raug hloov pauv hauv kev ua haujlwm. Cov tub ntxhais kawm cov ntaub ntawv tuaj yeem raug tshaj tawm tias yog ob qho tib si const thiab zoo li qub rau cov chav kawm dav. Reference variables yuav const thaum lawv xa mus rau qhov chaw const.

Dab tsi yog tus cim hauv C?

"Identifiers" lossis "symbols" yog cov npe koj muab rau cov hloov pauv, hom, haujlwm, thiab cov ntawv sau hauv koj qhov program. … Koj tsim tus cim los ntawm kev qhia nws hauv kev tshaj tawm ntawm qhov sib txawv, hom, lossis ua haujlwm.