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Int, Double, Float, Long

Int, Double, Float, and Long are different-sized number boxes: small whole numbers, big whole numbers, and numbers with decimals. You pick the box that fits the number you have.

In this page:

  1. Int, Double, Float, Long
Syntax
scala 
val i: Int = 42
val l: Long = 42L
val d: Double = 3.14
val f: Float = 3.14f

Int, Double, Float, Long

Int is a 32-bit whole number, Long extends that to 64 bits (with an L suffix on literals), and Double/Float represent 64-bit and 32-bit floating-point numbers respectively (with an f suffix for Float literals).

Double is the default type for decimal literals unless a Float is explicitly requested. Choosing the right numeric type matters for both precision and memory usage.

Note: Without an explicit type annotation or suffix, a decimal literal like 3.14 is inferred as Double, not Float.

Example: Int, Double, Float, Long

markup 
object Main extends App {
  val age: Int = 30
  val population: Long = 8000000000L
  val price: Double = 19.99
  val temperature: Float = 36.6f

  println(s"$age $population $price $temperature")
}
Related Topics

val vs var · Boolean · Char · String

{# common_mistakes/chapter_summary/browser_support: on Hindi pages the view already swaps in the hi_ translation fields (or blanks these out if untranslated), so this renders correctly for both languages without a lang_code check here. #}
Common Mistakes
  1. Storing a big number like val big: Long = 8000000000 with no L, causing an integer number too large error.
  2. Writing val f: Float = 36.6 without f, causing a type error because 36.6 is a Double.
  3. Dividing two Int values such as 7 / 2 and expecting 3.5, when it gives 3.
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