octal

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Octal
The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7.Octal numerals can be made from binary numerals by grouping consecutive digits into groups of three (starting from the right). For example, the binary representation for decimal 74 is 1001010, which groups into 001 001 010 — so the octal representation is 112. In decimal systems each decimal place is a base of 10 for example, 74 = 7 x 10^1 + 4 x 10^0. since 7 x 10^1 = 70 + 4 x 10^0= 4, 70+4 = 74. In octal numerals each place is a power with base 8 for example 112= 1 x 8^2 + 1 x 8^1 + 2 x 8^0 since 1 x 8^2 = 64 + 1 x 8^1 = 8 + 2 x 8^0 = 2, 112 in octal is equal to 64+8+2 = 74. This is why 112 in octal is equal to 74 in decimal. Octal is sometimes used in computing instead of hexadecimal.
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Octal
Cette page d’ répertorie les différents sujets et articles partageant un même nom. 
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Système octal
Le système de numération octal est le système de numération de base 8, et utilise les chiffres de 0 à 7. En accord avec l'ouvrage de Donald Knuth's, The Art of Computer Programming, il fut inventé par le roi Charles XII de Suède.
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Oktalsystem
Das Oktalsystem (von lateinisch octo acht) ist ein Stellenwertsystem mit der Basis 8 (daher auch Achtersystem genannt). Es kennt acht Ziffern zur Darstellung einer Zahl: 0, 1, 2, 3, 4, 5, 6 und 7.Seine Ursprünge finden sich im Schweden des 17. Jahrhunderts; als Urheber kommen König Karl XII., der Wissenschaftler Emanuel Swedenborg oder der Erfinder Christopher Polhem in Frage.
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Ósemkowy system liczbowy
Ósemkowy system liczbowy to pozycyjny system liczbowy o podstawie 8. System ósemkowy jest czasem nazywany oktalnym od słowa octal. Do zapisu liczb używa się w nim ośmiu cyfr, od 0 do 7.Jak w każdym pozycyjnym systemie liczbowym, liczby zapisuje się tu jako ciągi cyfr, z których każda jest mnożnikiem kolejnej potęgi liczby będącej podstawą systemu, np. liczba zapisana w dziesiętnym systemie liczbowym jako 100, w ósemkowym przybiera postać 144, gdyż:1×82 + 4×81 + 4×80 = 64 + 32 + 4 = 100.
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Sistema numerico ottale
Il sistema numerico ottale (spesso abbreviato come ott o oct) è un sistema numerico posizionale in base 8, cioè che utilizza solo 8 simboli (tipicamente 0, 1, 2, 3, 4, 5, 6, 7) invece dei 10 del sistema numerico decimale usato comunemente. I numeri ottali (insieme ai numeri binari e esadecimali) vengono diffusamente utilizzati in svariati campi della scienza e della tecnica ed in particolare nell'informatica.Ecco una tabella che confronta le rappresentazioni binarie, ottali e decimali ed esadecimali dei numeri dallo zero al quindici: Perciò il numero decimale 79, ad esempio, la cui rappresentazione binaria è 0100 1111, può essere scritto come 117 in ottale.
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