Video: Dab tsi yog siv qhov system hauv C #?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
qhov system () yog siv los hais txog kev ua haujlwm qhov system lus command a C /C++ program. int qhov system (const char * lus txib); Siv qhov system (), peb tuaj yeem ua txhua yam lus txib uas tuaj yeem khiav ntawm lub davhlau ya nyob twg yog tias ua haujlwm qhov system tso cai. Piv txwv li, peb tuaj yeem hu tau qhov system ("dir") ntawm Windows thiab qhov system ("ls") los sau cov ntsiab lus ntawm cov npe.
Tom qab ntawd, ib tus tuaj yeem nug, qhov system ua li cas hauv C?
Hauv C Programming Language, cov qhov system function tso cai rau ib C program los khiav lwm qhov kev pab cuam los ntawm kev hla kab hais kom ua (qhia los ntawm txoj hlua) rau kev khiav hauj lwm qhov system command processor uas yuav ces raug tua.
Tsis tas li ntawd, System Library hauv C yog dab tsi? A tsev qiv ntawv hauv C yog ib phau ntawm cov ntaub ntawv header, nthuav tawm rau kev siv los ntawm lwm cov kev pab cuam. Cov tsev qiv ntawv yog li ntawd muaj ib tug interface qhia nyob rau hauv ib tug. h cov ntaub ntawv (lub npe hu ua "header") thiab ib qho kev siv tau qhia hauv. c ntaub ntawv. Format a tsev qiv ntawv nws txawv nrog kev ua haujlwm qhov system thiab compiler ib tug yog siv.
Kuj kom paub, System Command hauv Linux yog dab tsi?
qhov system () executes a lus txib teev nyob rau hauv lus txib los ntawm kev hu /bin/sh -c lus txib , thiab rov qab los tom qab lub lus txib tau ua tiav. Thaum lub sij hawm execution lus txib , SIGCHLD yuav raug thaiv, thiab SIGINT thiab SIGQUIT yuav raug tsis quav ntsej.
Vim li cas peb thiaj siv qhov system ncua hauv C ++?
Hauv cov ntsiab lus, nws muaj nres cov kev pab cuam execution thiab ua a qhov system hu thiab faib cov peev txheej tsis tsim nyog thaum koj yuav yog siv tej yam yooj yim li cin. tau (). Cov neeg siv System (" PAUSE ") vim lawv xav kom qhov kev zov me nyuam tos kom txog thaum lawv ntaus nkag mus rau lawv tuaj yeem pom lawv cov zis.
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
Yuav ua li cas yog ib tug txheej txheem nyob rau hauv lub operating system dab tsi yog ib tug xov nyob rau hauv lub operating system?
Ib tug txheej txheem, nyob rau hauv cov nqe lus yooj yim tshaj, yog ib tug executingprogram. Ib tug los yog ntau tshaj threads khiav nyob rau hauv cov ntsiab lus ntawm cov txheej txheem. Ib tug xov yog ib qho tseem ceeb chav tsev uas theoperating system faib lub sij hawm processor. Lub threadpool feem ntau yog siv los txo tus naj npawb ntawm cov ntaub ntawv thov thiab muab kev tswj hwm ntawm cov neeg ua haujlwm threads
Dab tsi yog qhov zoo ntawm txheej txheej rau kev tsim qauv hauv kev khiav hauj lwm qhov system?
Nrog rau txheej txheej, txheej hauv qab yog cov khoom siv kho vajtse, thaum txheej siab tshaj plaws yog cov neeg siv interface. Lub ntsiab kom zoo dua yog simplicity ntawm kev tsim kho thiab debugging. Qhov teeb meem tseem ceeb yog txhais cov txheej txheem ntau yam. Lub ntsiab tsis zoo yog tias OS nyiam ua haujlwm tsawg dua li lwm yam kev siv
Tus neeg siv khoom siv qhov system yog dab tsi?
Tus neeg siv khoom yog ib qho ntawm cov khoos phis tawj kho vajtse lossis software uas nkag mus rau qhov kev pabcuam tsim los ntawm lub server. Tus neeg rau zaub mov feem ntau (tab sis tsis tas li) ntawm lwm lub khoos phis tawj, nyob rau hauv rooj plaub uas tus neeg siv nkag mus rau qhov kev pabcuam los ntawm kev sib txuas lus
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