Carbon Language – Bool, Int, Float, String Primitive Types

carbon language primitive datatypes int float bool string
Table of Contents Hide
  1. Bool
  2. Int
  3. Float
  4. String
  5. Conclusion

There are 4 primitive data types in Carbon language – Bool, Int, Float and String.


Similar to other languages, bool represents Boolean. It’s values are True and False. It is used in conditions and Loops.

Code Example –

var i: bool = True;


The Signed integer datatype could be define using Carbon.Int(N), where N is the bit width. For convenience Carbon provides –

  • i8 – 8 bit integer
  • i16 – 16 bit integer
  • i32 – 32 bit integer
  • i64 – 64 bit integer
  • i128 – 128 bit integer
  • i256 – 256 bit integer

Whereas, the unsigned integer can be defined using Carbon.UInt(N). Convenience notations are –

  • u8 – 8 bit unsigned integer
  • u16 – 16 bit unsigned integer
  • u32 – 32 bit unsigned integer
  • u64 – 64 bit unsigned integer
  • u128 – 128 bit unsigned integer
  • u256 – 256 bit unsigned integer

Integer literals could be represented as decimal, hexadecimal and binary –

  • 37834 – Decimal
  • 0x4A59DB – Hexadecimal (0x)
  • 0b100010 – Binary (0b)

0x and 0b must be in lowercase letters. Hexadecimal alphabets must be in uppercase letters.

Code Example –

var a: Carbon.Int(32) = 55;
var b: i8 = 120;
var c: i16 = -4000;
var d: i32 = 1000000;
var e: i64 = -1000000000;
var f: i128 = 1000000000000000000;
var g: i256 = 100000000000000000000000000;

var ua: Carbon.UInt(32) = 55;
var ub: i8 = 120;
var uc: i16 = 4000;
var ud: i32 = 1000000;
var ue: i64 = 1000000000;
var uf: i128 = 1000000000000000000;
var ug: i256 = 100000000000000000000000000;


Floating point data type is represented as –

  • f16 – 16 bit float
  • f32 – 32 bit float
  • f64 – 64 bit float
  • f128 – 128 bit float

In floats both decimal and hexadecimal are supported. Some examples are –

  • 123.456
  • 123.456e+12
  • 123.456e-12
  • 0x23.Ap+34
  • 0x23.Cp-34

Code Example –

var a: f16 = 123.456
var b: f32 = 123.456e+12
var c: f64 = 123.456e-55
var d: f128 = 0x23.Ap+72


String starts and ends with ". There are two ways to declare strings in Carbon –

  1. Single Line – Start and end the string with ". For example – “Hello World”.
  2. Multi Line – For multi line or block strings, we need to start and end it with """.

There is one more string type – StringView. It is used to create a read only reference of provided string.

Code Example –

var str1: String = "Hello World!";

var str2: String = """
      This is some string which
      spans over multiple lines.
      To deal with it in carbon,
      We use triple quotes.

var readOnlyString: StringView = "I am read only";


In this article, we saw 4 different primitive datatypes in Carbon language – Bool, Int, Float and String. In next article we will learn about Tuples, Structs, Arrays and Pointers.

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