html/template is not showing a float value with e 07 notation in exact decimal places-CodePudding

I'm trying an example where I'm passing a value 1.8e 07 to the TestVal field of struct Student. Now I want this 1.8e 07 value to be in exact decimal places but it is not doing so. It is able to show the value in exact decimal places(180000) if the value is 1.8e 05. But if it is greater than e 05 then it is unable to show it.

Example

package main

import (
    "fmt"
    "os"
    "text/template"
    
)

// declaring a struct
type Student struct {
    Name  string
    TestVal float32
}

// main function
func main() {

    std1 := Student{"AJ", 1.8e 07}

    // "Parse" parses a string into a template
    tmp1 := template.Must(template.New("Template_1").Parse("Hello {{.Name}}, value is {{.TestVal}}"))

    // standard output to print merged data
    err := tmp1.Execute(os.Stdout, std1)

    // if there is no error,
    // prints the output
    if err != nil {
        fmt.Println(err)
    }
}

Please help.

CodePudding user response：

That's just the default formatting for floating point numbers. The package doc of fmt explains it: The %v verb is the default format, which for floating numbers means / reverts to %g which is

%e for large exponents, %f otherwise. Precision is discussed below.

If you don't want the default formatting, use the printf template function and specify the format you want, for example:

{{printf "%f" .TestVal}}

This will output (try it on the Go Playground):

Hello AJ, value is 18000000.000000

Or use:

{{printf "%.0f" .TestVal}}

Which will output (try it on the Go Playground):

Hello AJ, value is 18000000

See related:

Format float in golang html/template