Course of Raku / Advanced / More about built-in types / Integers

Number bases

An integer literal does not have to be written in the decimal system. Raku understands the three most common alternative bases out of the box, each with its own prefix:

say 0xFF;   # 255  — hexadecimal (base 16)
say 0b1010; # 10   — binary (base 2)
say 0o17;   # 15   — octal (base 8)

Whichever base you use in the source code, the value is the same integer; only the notation differs.

For any other base, use the radix form :base<number>:

say :16<FF>;   # 255
say :2<1010>;  # 10

To go the other way — from a number to its representation in another base — call the base method. It returns a string of digits:

say 255.base(16); # FF
say 10.base(2);   # 1010

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