Float Data type Usage and Type Conversion in Kotlin

Definition

• A float is a 32-bit number in Kotlin. Float number is tagged with “f” or “F”
• The type can be either declared explicitly or the compiler itself has the ability to infer the type of the assigned value.
• In JVM, the characteristics of this “Float” variable is derived from the characteristics of primitive type float of Java which has a non-nullable default value.

Syntax and declaration

Thus a Float value can be declared by 3 ways as mentioned below.

1. Mentioning type explicitly

val variable_name : Float = value

for example,

val number : Float = 100f

2. Number type is automatically inferred

val variable_name = value

for example,
//Number type is automatically inferred
val number = 100f

3. Declaring and Initializing separately

var variable_name : Float 
variable_name = value

for example

//Declaring and Initializing separately
var number:Float 
number = 100f

Float Datatype Example Program in Kotlin

// Float Datatype Kotlin example program
// Data type Kotlin Programs, Basic Kotlin Programs

fun main(args:Array<String>) {
    //Assigning value to Float variable explicitly
    val a:Float = 22.8f
    //Assigned value is inferred automatically by compiler
    val b = 100.0f

    println("Value of a is $a")
    println("Value of b is $b")
}

Sample Output

Value of a is 22.8
Value of b is 100.0

Type conversion syntax and declaration

//String to Float Conversion 
val variable_name = "string".toFloat()

//Int and Double to Float Conversion 
val variable_name = int_variable.toFloat()

Float type Conversion Example Program in Kotlin

// Float Datatype Kotlin example program
// Data type Kotlin Programs, Basic Kotlin Programs

fun main(args: Array < String > ) {
    //Conversion from String and Float type is inferred
    val num1 = "500".toFloat()

    //Conversion from String and Declaring an Float value immediately
    val num2: Float = "100".toFloat()

    val num3: Int = 1000
    //Conversion from Float
    val num4: Float = num3.toFloat()

    val num5: Double = 2000.31e0
    //Conversion from Double
    val num6: Float = num5.toFloat()

    //Print values after conversion
    println("String to Float : num1 Value : $num1")
    println("String to Float : num2 Value : $num2")
    println("Float Value : num3 Value : $num3")
    println("Float to Float : num4 Value : $num4")
    println("Double Value : num5 Value : $num5")
    println("Double to Float : num6 Value : $num6")
}

Sample Output

String to Float : num1 Value : 500.0
String to Float : num2 Value : 100.0
Float Value : num3 Value : 1000
Float to Float : num4 Value : 1000.0
Double Value : num5 Value : 2000.31
Double to Float : num6 Value : 2000.31

How It Works

This Kotlin program demonstrates Float Data type Usage and Type Conversion. It first prepares the data it needs, then performs the core operation step by step, and finally prints the output shown in the Sample Output above.

1. Declare the variables that hold the program’s data.
2. Print the final result to the console so you can compare it with the sample output.

Try changing the input values and re-running the program to see how the output changes — this is the fastest way to understand how the logic behaves.