Numbers

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

• An exact integer value (of type int)
• The floating point value that minimally diverges from the written digits (of type num)

Wolf programs cannot redefine what these names mean.

Integers

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

5
12345
42
1337

Numbers

A dot . can be written after an integer to append a fractional part. When a dot is present, the type is num, even if the fractional part is 0.

-- This refers to the floating point value of 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 in integers and numbers, and will be ignored by Wolf.

-- These both refer to the floating point value of 123.45
1_2_3.4_5
123.45

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:

• nan - the floating point “Not a Number”, as from 0 / 0
• inf - the largest positive floating point number, positive infinity
• eul - the closest number to Euler’s number
• tau - the closest number to tau, the ratio of radius to circumference
• phi - the closest number to phi, the golden ratio