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Informatika alapok 2

Hardver és szoftver.

A mondat elejeA mondat vége
Az adattároláshoz a kettes számrendszert használjuk.
Legkisebb tárolási egység a bit.
1 bitnek 2 állapota lehet.
A bit-re gondolhatunk úgy, mint egy virtuális tároló edényre.
A bit értéke nulla (0), ha üres.
A bit értéke 1, ha nem üres.
A bitnek egy adott pillanatban csak egy állapota (érték) lehetséges.
A byte 8 egymás utáni bit neve.
1 byte-nak 256 állapota lehet.
Minden adat kettes számrendszerbeli számként tárolódik.
A betűk, írásjelek és számjegyek numerikus azonosítására bevezették az ASCII kódtáblát.
A numerikus adatok értelmezhetősége miatt bevezették az adattípus fogalmát.
A numerikus adatok típusba sorolása azt határozza meg, hogy az adott értéket minek kell értelmezni.
Fontosabb adattípusok: szám, karakter, tömb, logikai érték (Y/N).
A bit nem címezhető.
A legkisebb címezhető adat a byte.
Created by: solymita
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