How to Parse and Format Numbers as Strings in Go

Use strconv.FormatInt to convert integers to strings and strconv.ParseInt to parse strings back into integers.

package main

import (
	"fmt"
	"strconv"
)

func main() {
	// Int to String
	num := int64(12345)
	str := strconv.FormatInt(num, 10)
	fmt.Println(str) // Output: 12345

	// String to Int
	parsed, err := strconv.ParseInt(str, 10, 64)
	if err != nil {
		fmt.Println("Error:", err)
		return
	}
	fmt.Println(parsed) // Output: 12345
}

For floating-point numbers, use strconv.FormatFloat and strconv.ParseFloat instead.

Go provides built-in tools to switch numbers between text and math formats. You use one function to turn a number into a word-like string for display, and another to turn that string back into a number for calculations. Think of it like translating a number into a different language and then translating it back.