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What is the Nextafter32 function in golang?

Faraz Karim

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The Nextafter32 function is used to find the next representable float32 value after/between the two provided arguments. This function is basically the 32-bit version of the Nextafter function. Nextafter32 returns the number immediately after x that is between x and y (x and y being the first and second arguments for the function).

To use the Nextafter32 function, you must import the math package in your file and access the Nextafter32 function within it using the . notation (math.Nextafter32). Here, Nextafter32 is the actual function, while math is the Go package that stores the definition of this function.

Function definition

The definition of the Nextafter32 function inside the math package is as follows:

Parameters

The Nextafter32 function takes two arguments of type float32:

• x: This is an argument of type float32. The Nextafter32 function finds the next representable float32 value after x.

• y: This is an argument of type float32. The Nextafter32 function finds the next representable float32 value after x that is in the direction of y.

Return value

The Nextafter32 function returns a single value of type float32 that represents the next representable float32 number after x that is in the direction of y.

Some special cases are when you pass something that is infinity, 0, or NAN as an argument:

• If both arguments are the same value, let’s say x, then the Nextafter32 function returns that value (x).

• If either of the two arguments is of type NAN, then the return value is also NAN.

Code

Below is a simple example where we find out the next representable float32 number after $5.35$ towards $1$:

package mainimport(  "fmt"   "math") func main() {	var x float32 = 5.35 	y := math.Nextafter32(x,1)	fmt.Print("The next representable float32 after ", x," is ", y)}

The example below shows how the Nextafter32 function handles two identical arguments:

package mainimport(  "fmt"   "math") func main() {	y := math.Nextafter32( 1 ,1)	fmt.Print("The next representable float32 after ", 1," is ", y)}

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Faraz Karim