How to Format Integers with Thousands Commas using fmt.Printf in Go?

Comma-Separated Integers with fmt.Printf

In Go, the fmt.Printf function provides a versatile way to format and print various data types, including integers. However, by default, fmt.Printf does not support outputting integers with thousands commas.

To address this need, the golang.org/x/text/message package offers localized formatting, allowing you to print numbers according to the cultural norms of different languages.

Utilizing the message Package

To use the message package:

1. Import the package into your Go program:

   <code class="go">import (
    "golang.org/x/text/language"
    "golang.org/x/text/message"
   )</code>

2. Create a message Printer for a specific language. In this case, we use English:

   <code class="go">p := message.NewPrinter(language.English)</code>

3. Use the Printer to format and print your integer using "%d":

   <code class="go">p.Printf("%d\n", 1000)</code>

Example Output

Running the provided code will print the integer 1000 with a thousands comma separator:

1,000

This approach leverages the Unicode CLDR (Common Locale Data Repository) to provide accurate and culturally appropriate formatting for various languages and locales.

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