There are four basic type of constants in Orange: numbers, characters, booleans, and strings.

Numeric Constants

A number can be written in decimal form with or without a decimal point, like 120 or 91.42. The format is an integer constant, and the latter is a real number constant.

Integer constants can also be written in binary, octal, or hexadecimal format by prefixing the constant with 0b, 0o and 0x respectively.

Numeric constants can have their type enforced by suffixes. For whole number constants, there are a set of suffixes for signed and unsigned integers.

  • Signed suffixes: i, i8, i16, i32, i64
  • Unsigned suffixes: u, u8, u16, u32, u64

For real numbers, a suffix of f or d can be used for floating point and double-floating point respectively.

Underscores after the optional prefix and first digit of any numeric constant are ignored and can be used at will for grouping numbers, like 0b1001_1000, 1_500_423 or even 1_500_423.95.

Character Constants

A character constant is any ASCII single-byte character enclosed in single quotes.

Escape Sequences

Special characters can be achieved by escaping a certain character with a backslash. These are valid for character constants and string constants. The valid special character sequences are:

  • \n: Newline
  • \r: Carriage return
  • \t: Tab
  • \v: Vertical tab
  • \': Single quote
  • \": Double quote
  • \\: Backslash

Boolean Constants

Boolean constants are the simplest, where only false and true are valid values.


A string is like a character constant except that it allows for multiple characters and also allows for any UTF-8 sequence, including unicode characters. A string can be formed by enclosing a sequence of characters in double quotes.

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