How to use the strconv.AppendFloat() function in Golang

Golang `strconv.AppendFloat()`

The strconv package’s AppendFloat() method in Golang is used to append the string form of the specified floating-point number f (as generated by the FormatFloat() function) to dst and return the extended buffer. The parameter dst is of type []byte and f is of type float64.

Syntax

func AppendFloat(
    dst []byte, 
    f float64, 
    fmt byte, 
    prec, bitSize int) []byte

Parameters

dst: This is a byte array to which the floating-point number is to be appended as a string.
f: This is the floating-point number to be appended to dst.
fmt: This is used to specify formatting.
prec: This is the precision of the floating-point number which will be appended to the string.
bitSize: This is the bit size (32 for float32, 64 for float64).

Return value

The function AppendFloat() returns the extended buffer after appending the given floating-point value.

Code

The following code shows how to implement the strconv.AppendFloat() in Golang.


// Using strconv.AppendFloat() Function 
package main
import (
	"fmt"
	"strconv"
)
func main() {
  // Declaring and assigning value
  x := []byte("Some text with a float64: ")
	fmt.Println("Before AppendFloat():", string(x))
	// Appending float-point value
  // prec, fmt, and bitsize
	x = strconv.AppendFloat(x, 56.37781, 'E', -1, 64)
	fmt.Println("After AppendFloat():",string(x))
  fmt.Println()
	
    // Declaring and assigning value
  y := []byte("Some text with a float64: ")
	fmt.Println("Before AppendFloat():", string(y))
	// Appending float-point value
  // prec, fmt, and bitsize
	y = strconv.AppendFloat(x, 56.37781, 'g', 2, 32)
	fmt.Println("After AppendFloat():",string(y))
  fmt.Println()
}