CODEWITHSUNDEEP
scala
Prakhar Vaish
Prakhar Vaish

Reputation: 11

Weird behavior in Scala

How to justify below codes in Scala ? Can someone explain why does it return True in Example 3 and False in first two examples ?

Example 1:

scala> val f1 = 5.2
val f1: Double = 5.2

scala> val f2 = 5.2F
val f2: Float = 5.2

scala> f1==f2
val res8: Boolean = false

Example 2:

scala> val f1 = 5.24
val f1: Double = 5.24

scala> val f2 = 5.24F
val f2: Float = 5.24

scala> f1==f2
val res9: Boolean = false

Example 3:

scala> val f1 = 5.25
val f1: Double = 5.25

scala> val f2 = 5.25F
val f2: Float = 5.25

scala> f1==f2
val res10: Boolean = true

Upvotes: 1

Views: 84

Answers (1)

Tim
Tim

Reputation: 27356

Nothing to do with Scala, but most decimal factions cannot be accurately represented as binary floating point numbers. For those numbers, the Float value will be different from the Double value so == will return false.

In this case 5.25 does have an accurate binary floating point value (101.01) so both the Float and the Double are the same.

Upvotes: 9

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