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How to Convert Float to String type in Go?

Like most modern languages, Golang includes Float as a built-in type. Let's take an example, you may have a variable that contains a Float value. In order to convert Float value into string type in Golang, you can use the following methods.
FormatFloat method
You can use the strconv package's FormatFloat() function to convert the float into an string value. FormatFloat converts the floating-point number f to a string, according to the format fmt and precision prec. It rounds the result assuming that the original was obtained from a floating-point value of bitSize bits (32 for float32, 64 for float64).

Syntax

func FormatFloat(f float64, fmt byte, prec, bitSize int) string

Example

package main

import (
	"fmt"
	"reflect"
	"strconv"
)

func main() {
	var f float64 = 3.1415926535
	fmt.Println(reflect.TypeOf(f))
	fmt.Println(f)

	var s string = strconv.FormatFloat(f, 'E', -1, 32)
	fmt.Println(reflect.TypeOf(s))
	fmt.Println(s)
}

Output

float64
3.1415926535
string
3.1415927E+00
fmt.Sprintf() method
Sprintf formats according to a format specifier and returns the resulting string. Here, a is of Interface type hence you can use this method to convert any type to string.

Syntax

func Sprintf(format string, a ...interface{}) string

Example

package main

import (
	"fmt"
	"reflect"
)

func main() {
	b := 12.454
	fmt.Println(reflect.TypeOf(b))

	s := fmt.Sprintf("%v", b)
	fmt.Println(s)
	fmt.Println(reflect.TypeOf(s))
}

Output

float64
12.454
string
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