Nim has several primitive types:

• floating points numbers: float32, float64, and float, where float is the processor’s fastest type
• characters: char, which is basically an alias for uint8

Integers

There are signed and unsigned integers of different sizes:

• signed integers: int8, int16, int32, int64, and int, where int is the same size as a pointer
• unsigned integers: uint8, uint16, uint32, uint64, and uint

These types can be specified as follows (the shorthand adding the type after the number):

let
  a:int8   = -4
  b:uint16 =  20
  c        = -500000'i64
  d        =  573'u32

The type can be inferred most of the times.

/ vs div

Difference:

• /: returns a floating point (even with integers operands)
• div: returns an integer.

hex, octal, or binary literals

let
  a: int8  = 0x7F        # Hexadecimal
  b: uint8 = 0b1111_1111 # Binary; underscores can help with readability
  d        = 0xFF        # type is int
  c: uint8 = 256         # Compile time error

Precedence

Precedence rules are the same as in most other languages, but instead of ^, &, |, >>, <<, the xor, and, or, shr, shl operators are used, respectively.

let
  a: int = 2
  b: int = 4
echo 4/2

nim c -r numbers2.nim
2.0

Another difference that may be surprising is that