SetCellFloat with precision is not correctly shown if the last digits are zeros

[LaurinX]

Description

Steps to reproduce the issue:
1.

package main

import (
	"fmt"
	excelize "github.com/360EntSecGroup-Skylar/excelize/v2"
)

func main(){
	f := excelize.NewFile()
	sheet := f.GetSheetName(0)
	value := float64(6.7800)
	f.SetCellFloat(sheet,"A1",value,3,64)
	fmt.Println(f.GetCellValue(sheet,"A1") )
	f.SaveAs("Book1.xlsx")
}

run it.
2. open Book1.xlsx with excel or libreoffice
3. Look at cell A1. It wont show the correct precision

Describe the results you received:
Result in Libreoffice = 6.78

Describe the results you expected:
Result should show in Libreoffice = 6.780
(GetCellValue gives the correct number)
Output of go version:

go version go1.15.3 linux/amd64

Excelize version or commit ID:

v2.4.0

Environment details (OS, Microsoft Excel™ version, physical, etc.):
Linux Mint 20.0, LibreOffice 6.4.7.2 40(Build:2)

[vale1410]

To the Excelize community:
Is there another way to set a cell to a number format of 3 decimal places ?

[xuri]

Hi @LaurinX, @vale1410, please create a style with number format by NewStyle, and set the style by SetCellStyle like this:

f.SetCellFloat(sheet, "A1", value, 3, 64)
numberFmt := "0.000"
styleID, err := f.NewStyle(&excelize.Style{CustomNumFmt: &numberFmt})
if err != nil {
    fmt.Println(err)
}
if err := f.SetCellStyle(sheet, "A1", "A1", styleID); err != nil {
    fmt.Println(err)
}

After that, the cell value will be shown correct precision in the Excel application if you open the saved spreadsheet. Not that Excelize doesn't support parse the custom number format, so the result got by the GetCellValue may be inconsistent with the Excel. I'll close this issue, and continue to discuss the number format issue in #660.