{"id":6524,"date":"2024-06-06T11:02:31","date_gmt":"2024-06-06T11:02:31","guid":{"rendered":"http:\/\/the-codest.localhost\/dictionary\/absolute-address\/"},"modified":"2026-04-13T11:52:54","modified_gmt":"2026-04-13T11:52:54","slug":"absoluuttinen-osoite","status":"publish","type":"dictionary","link":"https:\/\/thecodest.co\/fi\/dictionary\/absolute-address\/","title":{"rendered":"Absoluuttinen osoite"},"content":{"rendered":"

Mik\u00e4 on absoluuttinen osoite?<\/h1>\n

Absoluuttinen osoite on termi, jota k\u00e4ytet\u00e4\u00e4n yleisesti tietotekniikassa ja ohjelmoinnissa. Sill\u00e4 tarkoitetaan muistisolun tai tallennusyksik\u00f6n tietty\u00e4 sijaintia tietokoneen muistissa. Toisin sanoen se on yksil\u00f6llinen numeerinen arvo, joka on annettu muistipaikalle tietokonej\u00e4rjestelm\u00e4n muistihierarkiassa. Absoluuttinen osoite tunnetaan my\u00f6s nimell\u00e4 muistiosoite tai fyysinen osoite.<\/p>\n

Kun ohjelmaa suoritetaan, tietokoneen keskusyksikk\u00f6 hakee ohjeet ja tiedot<\/a> muistista. Tietyn k\u00e4skyn tai datan k\u00e4ytt\u00e4miseksi suorittimen on tiedett\u00e4v\u00e4 sen muistiosoite. Absoluuttinen osoitteistus tarjoaa suorittimelle tavan paikantaa muistipaikat tietokoneen muistihierarkiassa ja k\u00e4ytt\u00e4\u00e4 niit\u00e4.<\/p>\n

Jokaisella tietokonej\u00e4rjestelm\u00e4n muistipaikalla on yksil\u00f6llinen absoluuttinen osoite. Absoluuttinen osoite on bin\u00e4\u00e4riluku, joka kuvaa muistisolun sijaintia tietokoneen muistihierarkiassa. Absoluuttinen osoite esitet\u00e4\u00e4n tavallisesti heksadesimaalimerkinn\u00f6ill\u00e4, joita ihmisten on helpompi lukea ja ymm\u00e4rt\u00e4\u00e4.<\/p>\n

Kun ohjelma k\u00e4\u00e4nnet\u00e4\u00e4n, k\u00e4\u00e4nt\u00e4j\u00e4 antaa absoluuttiset osoitteet ohjelman jokaiselle k\u00e4skylle ja dataelementille. Absoluuttinen osoite m\u00e4\u00e4r\u00e4ytyy tietokoneen muistihierarkian koon ja organisaation mukaan. T\u00e4m\u00e4 tarkoittaa, ett\u00e4 muistipaikan absoluuttinen osoite voi olla erilainen eri tietokoneissa tai jopa samassa tietokoneessa, jos muistihierarkiaa muutetaan.<\/p>\n

Absoluuttista osoitteistusta on kahdenlaista: suoraa ja ep\u00e4suoraa. Suoraa osoitusta k\u00e4ytet\u00e4\u00e4n, kun muistipaikka ilmoitetaan suoraan k\u00e4skyss\u00e4. Ep\u00e4suoraa osoitusta k\u00e4ytet\u00e4\u00e4n, kun muistipaikka m\u00e4\u00e4ritet\u00e4\u00e4n ep\u00e4suorasti osoittimen tai indeksin avulla.<\/p>\n

Absoluuttisen osoituksen etuna on, ett\u00e4 se tarjoaa suorittimelle nopean ja tehokkaan tavan k\u00e4ytt\u00e4\u00e4 muistipaikkoja. Prosessori voi hakea nopeasti tietoja ja ohjeita muistista k\u00e4ytt\u00e4m\u00e4ll\u00e4 absoluuttista osoitetta. Absoluuttisella osoitteistuksella on kuitenkin my\u00f6s joitakin haittoja. Yksi merkitt\u00e4v\u00e4 haittapuoli on se, ett\u00e4 se vaikeuttaa ohjelmien siirt\u00e4mist\u00e4 muistissa. Jos ohjelma siirret\u00e4\u00e4n eri paikkaan muistissa, kaikki sen absoluuttiset osoitteet on p\u00e4ivitett\u00e4v\u00e4.<\/p>\n

Yhteenvetona voidaan todeta, ett\u00e4 absoluuttinen osoitteistus on perustavanlaatuinen k\u00e4site tietojenk\u00e4sittelytieteess\u00e4 ja ohjelmoinnissa. Se tarjoaa suorittimelle tavan paikantaa ja k\u00e4ytt\u00e4\u00e4 muistipaikkoja tietokoneen muistihierarkiassa. Absoluuttinen osoitteistus on v\u00e4ltt\u00e4m\u00e4t\u00f6nt\u00e4 tietokonej\u00e4rjestelmien tehokkaalle toiminnalle, mutta sill\u00e4 on my\u00f6s joitakin rajoituksia, jotka ohjelmoijien ja j\u00e4rjestelm\u00e4suunnittelijoiden on otettava huomioon.<\/p>","protected":false},"excerpt":{"rendered":"

Tutustu absoluuttiseen osoitteeseen tietotekniikassa ja ohjelmoinnissa. Tutustu sen toimintaan, etuihin ja haittoihin. Lue lis\u00e4\u00e4 t\u00e4\u00e4lt\u00e4.<\/p>","protected":false},"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6524","dictionary","type-dictionary","status-publish","hentry"],"acf":[],"yoast_head":"\nAbsolute Address - The Codest<\/title>\n<meta name=\"description\" content=\"Learn about absolute address in computer science and programming. Discover how it works, its advantages, and disadvantages. 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