Go int to string
last modified April 11, 2024
In this article we show how to convert integers to strings in Golang.
Go int to string conversion
Integer to string conversion is a type conversion or type casting, where an entity of integer data type is changed into string one.
In Go, we can perform the int to string conversion with the strconv.FormatInt,
strconv.Itoa, or fmt.Sprintf functions.
The strconv package implements conversions to and from string
representations of basic data types.
$ go version go version go1.22.2 linux/amd64
We use Go version 1.22.2.
Go int to string with Itoa
The Itoa is a convenience function which convers an integer to a
string.
func Itoa(i int) string
The Itoa is equivalent to FormatInt(int64(i), 10).
package main
import (
"fmt"
"strconv"
)
func main() {
var apples int = 6
n := strconv.Itoa(apples)
msg := "There are " + n + " apples"
fmt.Println(msg)
fmt.Printf("%T\n", apples)
fmt.Printf("%T\n", n)
}
In the code example, we convert the number of apples into a string to build a message.
Later, we output the type of the apples and n variables.
$ go run int2str.go There are 6 apples int string
Go int to string with strconv.FormatInt
The strconv.FormatInt returns the string representation of a value
in the given base; where for 2 <= base <= 36.
package main
import (
"fmt"
"strconv"
)
func main() {
var file_size int64 = 1544466212
file_size_s := strconv.FormatInt(file_size, 10)
msg := "The file size is " + file_size_s + " bytes"
fmt.Println(msg)
}
In the code example, we convert the file_size variable, which has
type int64, to a string with strconv.FormatInt.
$ go run int2str2.go The file size is 1544466212 bytes
Go int to string with fmt.Sprintf
Another way to convert an integer to a string is to use the fmt.Sprintf
function. The function formats according to a format specifier and returns the
resulting string.
package main
import (
"fmt"
)
func main() {
var apples int = 6
msg := fmt.Sprintf("There are %d apples", apples)
fmt.Println(msg)
}
The fmt.Sprintf formats a new string; it replaces the %d
specifier with an integer value.
In this article we have shown how to perform int to string conversions in Go.
Source
Go strconv package - reference
Author
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