convert float to string golang

stackoverflow.com › questions › 53312828 › how-to-convert-float-to-string

Use strconv.FormatFloat like such:

s := strconv.FormatFloat(3.1415, 'f', -1, 64)
fmt.Println(s)

Outputs

3.1415

Answer from Ullaakut on Stack Overflow

YourBasic

yourbasic.org › golang › convert-string-to-float

Convert between float and string · YourBasic Go

CODE EXAMPLE Use strconv.ParseFloat to parse a floating point number from a string, and fmt.Sprintf to format a float as a string.

Stack Overflow

stackoverflow.com › questions › 53312828 › how-to-convert-float-to-string

go - How to convert float to string - Stack Overflow

Top answer

1 of 4

Use strconv.FormatFloat like such:

s := strconv.FormatFloat(3.1415, 'f', -1, 64)
fmt.Println(s)

Outputs

3.1415

2 of 4

Convert float to string

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).

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

f := 3.14159265
s := strconv.FormatFloat(f, 'E', -1, 64)
fmt.Println(s)

Output is "3.14159265"

Another method is by using fmt.Sprintf

s := fmt.Sprintf("%f", 123.456) 
fmt.Println(s)

Output is "123.456000"

Check the code on play ground

Discussions

Converting a float to string

http://golang.org/pkg/strconv/#FormatFloat http://golang.org/pkg/strconv/#ParseFloat If you don't care about errors, write a small wrapper func. More on reddit.com

r/golang

November 20, 2014

Problem converting float32 to string

HI I have problem with float32 to string conversion. My test code: package main import ( "fmt" "strconv" ) func main() { var t float32 t = 5.9902389 numeroString := strconv.FormatFloat(float64(t), 'f', -1, 32) fmt.Println("Number float32:", t) fmt.Println("Number string:", numeroString) } Responce: ... More on forum.golangbridge.org

forum.golangbridge.org

July 20, 2023

go - formatFloat : convert float number to string - Stack Overflow

How do I convert a float number into string format? This is google playground but not getting the expected output. More on stackoverflow.com

stackoverflow.com

Issue with type conversion from float64 to string

GO version- go1.13.1 when converting from float64 to string - GO is changing the value for Odd numbers. SAMPLE CODE- package main import ( "fmt" "strconv" ) func main() { var g ... More on github.com

github.com

January 31, 2020

Educative

educative.io › answers › how-can-we-convert-a-float-into-a-string-in-golang

How can we convert a float into a string in Golang

A float can be converted into a string, in Golang, using the following two functions: FormatFloat: This function is available within the strconv package. Sprintf: This function is available within the fmt package.

Go Packages

pkg.go.dev › strconv

strconv package - strconv - Go Packages

FormatFloat converts the floating-point number f to a string, according to the format fmt and precision prec.

reddit.com › r/golang › converting a float to string

r/golang on Reddit: Converting a float to string

November 20, 2014 -

What is the easy way of converting a float to a string?

The strconv package seems awfully cluttered and there doesn't seem to be a function where you can simply give a float and get a string

Top answer

1 of 2

http://golang.org/pkg/strconv/#FormatFloat http://golang.org/pkg/strconv/#ParseFloat If you don't care about errors, write a small wrapper func.

2 of 2

fmt.Sprintf.

Go Forum

forum.golangbridge.org › getting help

Problem converting float32 to string - Getting Help - Go Forum

July 20, 2023 - My test code: package main import ( "fmt" "strconv" ) func main() { var t float32 t = 5.9902389 numeroString := strconv.FormatFloat(float64(t), 'f', -1, 32) fmt.Println("Number float32:", t) fmt.Println("Number string:", numeroString) } Responce: ...

Reintech

reintech.io › blog › introduction-to-gos-strconv-package-string-conversions

An Introduction to Go's `strconv` Package: String Conversions | Reintech media

January 26, 2026 - It takes three arguments: the floating-point number, the format ('f', 'b', 'e', or 'g'), and the precision (number of decimal points), and the number of bits the floating-point number occupies (32 or 64). It returns a string representation of the floating-point number. The strconv.Itoa() function in Go is used to convert an integer to a string.

GitHub

gist.github.com › morrxy › b5972d4516e1e41229aba77f85894942

[int float to string] #golang · GitHub

[int float to string] #golang · Raw · float2str.go · This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.

Find elsewhere

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Admfactory

admfactory.com › home › how to convert a float to string in golang

How to convert a float to string in Golang | ADMFactory

June 11, 2020 - package main import ( "fmt" "strconv" ) func main() { /** float variable */ f := 1.23456789 /** converting the f variable into a string */ /** 5 is the number of decimals */ /** 64 is for float64 type*/ str := strconv.FormatFloat(f, 'f', 5, 64) /** displaying the string variable into the console */ fmt.Println(str) } To compile the code navigate to the file location and run the following command.

Stack Overflow

stackoverflow.com › questions › 19101419 › formatfloat-convert-float-number-to-string

go - formatFloat : convert float number to string - Stack Overflow

Top answer

1 of 1

165

Try this

package main

import "fmt"
import "strconv"

func FloatToString(input_num float64) string {
    // to convert a float number to a string
    return strconv.FormatFloat(input_num, 'f', 6, 64)
}

func main() {
    fmt.Println(FloatToString(21312421.213123))
}

If you just want as many digits precision as possible, then the special precision -1 uses the smallest number of digits necessary such that ParseFloat will return f exactly. Eg

strconv.FormatFloat(input_num, 'f', -1, 64)

Personally I find fmt easier to use. (Playground link)

fmt.Printf("x = %.6f\n", 21312421.213123)

Or if you just want to convert the string

fmt.Sprintf("%.6f", 21312421.213123)

Programming.Guide

programming.guide › go › convert-float-to-string.html

Go: Convert float to string | Programming.Guide

Use the fmt.Sprintf method to convert a floating-point number to a string.

Educative

educative.io › answers › how-to-convert-a-string-to-a-float-in-golang

How to convert a string to a float in Golang

If the input string is non-numeric, then this function will throw an invalid syntax error and the float value will be set to 0. The code snippet below shows how to convert a string to a float using the ParseFloat function.

DigitalOcean

digitalocean.com › community › tutorials › how-to-convert-data-types-in-go

How To Convert Data Types in Go | DigitalOcean

May 9, 2019 - Strings can be converted to numbers by using the strconv package in the Go standard library. The strconv package has functions for converting both integer and float number types. This is a very common operation when accepting input from the user. For example, if you had a program that asked ...

TutorialKart

tutorialkart.com › golang-tutorial › golang-convert-string-to-float

How to convert String to Float in Go Language?

July 1, 2021 - In this tutorial, we will learn the syntax of ParseFloat() function, and how to use this function to parse or convert a string to float value.

Python Examples

pythonexamples.org › go › how-to-convert-float-to-string

How to convert Float to String in Go

package main import ( "fmt" "strconv" ... declare a float variable float2 with a value of 10.5. We import the strconv package. We use the FormatFloat function to convert the float to a string and store the result in a variable str2....

GeeksforGeeks

geeksforgeeks.org › how-to-convert-string-to-float-type-in-golang

How to Convert string to float type in Golang? - GeeksforGeeks

May 19, 2020 - In order to convert Boolean Type to String type in Golang , you can use the strconv and fmt package function. 1. strconv.FormatBool() Method: The FormatBool is used to Boolean Type to String.

Siongui

siongui.github.io › 2017 › 04 › 13 › go-string-float-number-type-casting

[Golang] Type Conversion between String and Floating Number

package main import ( "fmt" "strconv" ) func main() { width := "560" height := "315" // convert string to float64 w, err := strconv.ParseFloat(width, 64) if err != nil { fmt.Println(err) } h, err := strconv.ParseFloat(height, 64) if err != nil { fmt.Println(err) } // make calculation and then convert float64 to string aspectRatio := strconv.FormatFloat(h*100/w, 'f', -1, 64) + "%" fmt.Println("aspect ratio: ", aspectRatio) }

go.dev › src › math › big › floatconv.go

This file implements string-to-Float conversion functions.

259 func (z *Float) Parse(s string, base int) (f *Float, b int, err error) { 260 // scan doesn't handle ±Inf 261 if len(s) == 3 && (s == "Inf" || s == "inf") { 262 f = z.SetInf(false) 263 return 264 } 265 if len(s) == 4 && (s[0] == '+' || s[0] == '-') && (s[1:] == "Inf" || s[1:] == "inf") { 266 f = z.SetInf(s[0] == '-') 267 return 268 } 269 270 r := strings.NewReader(s) 271 if f, b, err = z.scan(r, base); err != nil { 272 return 273 } 274 275 // entire string must have been consumed 276 if ch, err2 := r.ReadByte(); err2 == nil { 277 err = fmt.Errorf("expected end of string, found %q", ch) 278

GitHub

github.com › golang › go › issues › 36922

Issue with type conversion from float64 to string · Issue #36922 · golang/go

January 31, 2020 - package main import ( "fmt" "strconv" ) func main() { var g float64 g = 12643612166373552 var ss string ss = strconv.FormatFloat(g, 'f', 0, 64) fmt.Println(ss)

Author neetikh

Stack Overflow

stackoverflow.com › questions › 18951359 › how-to-format-floating-point-numbers-into-a-string-using-go

How to format floating point numbers into a string using Go - Stack Overflow

Top answer

1 of 2

Both fmt.Sprintf and strconv.FormatFloat use the same string formatting routine under the covers, so should give the same results.

If the precision that the number should be formatted to is variable, then it is probably easier to use FormatFloat, since it avoids the need to construct a format string as you would with Sprintf. If it never changes, then you could use either.

The last argument to FormatFloat controls how values are rounded. From the documentation:

It rounds the result assuming that the original was obtained from a floating-point value of bitSize bits (32 for float32, 64 for float64)

So if you are working with float32 values as in your sample code, then passing 32 is correct.

2 of 2

You will have with Go 1.12 (February 2019) and the project cespare/ryu a faster alternative to strconv:

Ryu is a Go implementation of Ryu, a fast algorithm for converting floating-point numbers to strings.
It is a fairly direct Go translation of Ulf Adams's C library.

The strconv.FormatFloat latency is bimodal because of an infrequently-taken slow path that is orders of magnitude more expensive (issue 15672).

The Ryu algorithm requires several lookup tables.
Ulf Adams's C library implements a size optimization (RYU_OPTIMIZE_SIZE) which greatly reduces the size of the float64 tables in exchange for a little more CPU cost.

For a small fraction of inputs, Ryu gives a different value than strconv does for the last digit.
This is due to a bug in strconv: issue 29491.

Go 1.12 might or might not include that new implementation directly in strconv, but if it does not, you can use this project for faster conversion.