Numbers

Names that look like numbers are reserved by Wolf. Each one refers either to:

Wolf programs cannot redefine what these names mean.

Integers

Names consisting of only digits refer to integer numbers of type int.

-- These both refer to the integer value of 12345
`12345`
12345

Numbers

A decimal point . can be used in the name to delimit an integer and fractional part. When a decimal point is present, the type is num, even if the fractional part is 0.

-- These refer to the floating point value of 0.125
0.125
`0.125`

-- The first value is the integer 0. The second value is floating-point 0.
0
0.0

Underscores

Underscores _ are permitted between digits, and will be ignored by Wolf.

-- These both refer to the floating point value of 12345
1_2_3_4_5
`12_345`

Scientific notation

An exponent can be added to any number when using backticks.

Use e after the main part of the number to delimit the exponent. It must be followed by either + or - to denote the sign of the exponent. Then, write the integer exponent.

Exponents are case sensitive and are only available when using decimal digits.

-- These are valid exponents.
`1.23e+45`
`1.23e-45`
-- This is not a valid exponent.
`1.23e45`

Change of base

Numbers starting with 0x are interpreted using hexadecimal digits instead of decimal digits.

Similarly, numbers starting with 0b are interpreted using binary digits.

As before, change of base prefixes are case sensitive.

-- These numbers are equal.
0xF_F
0b1111_1111
255

Bases can be used with both int and num types.

0xABC.DEF
0b1010.0011

Special numbers

A few names are reserved for useful special numbers: