Convert Float to Int in Swift

Question

I want to convert a Float to an Int in Swift. Basic casting like this does not work because these types are not primitives, unlike float

Answer 1

Use Int64 instead of Int. Int64 can store large int values.

Answer 2

You can get an integer representation of your float by passing the float into the Integer initializer method.

Example:

Int(myFloat)

Keep in mind, that any numbers after the decimal point will be loss. Meaning, 3.9 is an Int of 3 and 8.99999 is an integer of 8.

Answer 3

Explicit Conversion

Converting to Int will lose any precision (effectively rounding down). By accessing the math libraries you can perform explicit conversions. For example:

If you wanted to round down and convert to integer:

let f = 10.51
let y = Int(floor(f))

result is 10.

If you wanted to round up and convert to integer:

let f = 10.51
let y = Int(ceil(f))

result is 11.

If you want to explicitly round to the nearest integer

let f = 10.51
let y = Int(round(f))

result is 11.

In the latter case, this might seem pedantic, but it's semantically clearer as there is no implicit conversion...important if you're doing signal processing for example.

Answer 4

Just use type casting

 var floatValue:Float = 5.4
 var integerValue:Int = Int(floatValue)

 println("IntegerValue = \(integerValue)")

it will show roundoff value eg: IntegerValue = 5 means the decimal point will be loss

Answer 5

You can convert Float to Int in Swift like this:

var myIntValue:Int = Int(myFloatValue)
println "My value is \(myIntValue)"

You can also achieve this result with @paulm's comment:

var myIntValue = Int(myFloatValue)

Answer 6

var i = 1 as Int

var cgf = CGFLoat(i)