Parsing string into int64 example:
// Use the max value for signed 64 integer. http://golang.org/pkg/builtin/#int64
var s string = "9223372036854775807"
i, err := strconv.ParseInt(s, 10, 64)
if err != nil {
panic(err)
}
fmt.Printf("Hello, %v with type %s!\n", i, reflect.TypeOf(i))
output:
Hello, 9223372036854775807 with type int64!
https://play.golang.org/p/XOKkE6WWer
Answer from ET-CS on Stack Overflow Top answer 1 of 3
284
Parsing string into int64 example:
// Use the max value for signed 64 integer. http://golang.org/pkg/builtin/#int64
var s string = "9223372036854775807"
i, err := strconv.ParseInt(s, 10, 64)
if err != nil {
panic(err)
}
fmt.Printf("Hello, %v with type %s!\n", i, reflect.TypeOf(i))
output:
Hello, 9223372036854775807 with type int64!
https://play.golang.org/p/XOKkE6WWer
2 of 3
124
No, there's no Atoi64. You should also pass in the 64 as the last parameter to ParseInt, or it might not produce the expected value on a 32-bit system.
var s string = "9223372036854775807"
i, _ := strconv.ParseInt(s, 10, 64)
fmt.Printf("val: %v ; type: %[1]T\n", i)
https://play.golang.org/p/FUC8QO0-lYn
Bacancy Technology
bacancytechnology.com › qanda › golang › convert-string-to-int64
How to Convert Strings to int64 in Go: A Complete Guide
June 4, 2024 - If you need an int64, you should stick with strconv.ParseInt. Reading from Environment Variables Environment variables are often strings, even when they represent numerical values.
protojson: Add MarshalOption to write int64 as a number and not as a string
Is your feature request related to a problem? Please describe. When using the protonjson library int64 numbers are outputted as strings in the JSON due to this code: https://github.com/protocolbuff... More on github.com
5
February 17, 2022String to int (not int64) using ParseInt()/Atoi()
Greetings! Question about string to int conversion using package: strconv First, strconv.Atoi() returns type int. Second, it appears that strconv.ParseInt() never returns a type int. However, the language definition says: “The bitSize argument specifies the integer type that the result must ... More on forum.golangbridge.org
1
0
May 6, 2020The risks of converting int64 to string using a combination of "int()" and "strconv.Itoa"
int is just 32 bits wide on 32 bit systems. So int(amt) on those systems discards the upper 32 bits of the int64. Effectively int(amt) is int(amt % 1<<32) on 32 bit systems. package main import ( "fmt" "strconv" ) func main() { var i int64 = 1 << 32 fmt.Println(strconv.Itoa(int(i))) } Running with GOARCH=amd64 go run main.go outputs 4294967296 Whereas running with GOARCH=386 go run main.go outputs 0 More on reddit.com
9
2
January 27, 2023Strings slices to Integer Slices the most optimal way
Do you need the most optimized solution? But anyway, a simple optimization is to allocate the slice up front instead of appending to it and growing it to the target length: integers := make([]int, len(lines)) for i, line := range lines { ... integers[i] = n ... More on reddit.com
13
1
December 1, 2021What is type assertion in Golang?
In Go, a type assertion is a mechanism used to determine and extract the underlying concrete value from an interface type. It's primarily used when working with interface values, allowing you to access the actual value stored within the interface.
scaler.com
scaler.com › home › topics › type casting in golang
Type Casting in Golang - Scaler Topics
How do I change variable type in Golang?
In Go, you cannot directly change the type of a variable once it has been declared. Go is a statically typed language, which means that variable types are determined at compile-time and cannot be changed dynamically during program execution.
scaler.com
scaler.com › home › topics › type casting in golang
Type Casting in Golang - Scaler Topics
How do you convert types of Go?
In Go, you can convert between different types using type casting. Type casting allows you to change the data type of a value or variable explicitly. Here's how you can perform type conversions in Go:
scaler.com
scaler.com › home › topics › type casting in golang
Type Casting in Golang - Scaler Topics
Golang Docs
golangdocs.com › home › golang int64 to string conversion
Golang int64 to string conversion - Golang Docs
August 19, 2022 - If you have to convert int64 to string, use strconv.Itoa() function.
Go Packages
pkg.go.dev › strconv
strconv package - strconv - Go Packages
Package strconv implements conversions to and from string representations of basic data types.
Chrislearn's Blog
chrislearn.im › 2015 › 09 › go语言中stringintint64互相转换
go语言中string、int、int64互相转换 | Chrislearn's Blog
September 19, 2015 - #string到int int,err:=strconv.Atoi(string) #string到int64 int64, err := strconv.ParseInt(string, 10, 64) #int到string string:=strconv.Itoa(int) #int64到string string:=strconv.FormatInt(int64,10) 标签 GOLANG · 分享到 Facebook · 分享到 Twitter · 分享到 Google+ by · Apr 4, 2026 · In the Rust web framework world, Axum and Salvo are often put side by side. Both are written in Rust, both run on top of hyper, and both are async.
gosamples
gosamples.dev › tutorials › convert int to string in go
🔢 Convert int to string in Go
July 23, 2021 - Use strconv.FormatInt function to convert an integer variable to a string in Go. var number int64 = 12 str := strconv.FormatInt(number, 10) fmt.Println(str) var number int = 12 // you can use any integer here: int32, int16, int8 str := strconv.FormatInt(int64(number), 10) fmt.Println(str) To ...
Leapcell
leapcell.io › blog › how-to-convert-between-int64-and-string-in-golang
How to Convert Between `int64` and `string` in Golang | Leapcell
July 25, 2025 - Use strconv.FormatInt or fmt.Sprintf to convert int64 to string.
Dot Net Perls
dotnetperls.com › parseint-go
Go - ParseInt Examples: Convert String to Int - Dot Net Perls
July 6, 2023 - result := strconv.FormatInt(int64(value), 10) fmt.Println(result) if result == "1055" { fmt.Println(true) } } ... This method converts an int into a string. It calls FormatInt with a base of 10.
Scaler
scaler.com › home › topics › type casting in golang
Type Casting in Golang - Scaler Topics
September 28, 2023 - Number: int, int32, int64, uint32, ... · General type casting has a simple syntax. To convert that value, simply use that other type name as a function....
LinkedIn
linkedin.com › pulse › golang-convert-int-string-how-senior-developers-do-right-andhi-arifin-unlyc
Golang Convert Int to String: How Senior Developers Do It ...
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ZetCode
zetcode.com › golang › inttostring
Converting Integers to Strings in Go
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) }
YourBasic
yourbasic.org › golang › convert-int-to-string
Convert between int, int64 and string · YourBasic Go
See Pick the right one: int vs. int64 for best practices. The fmt.Sprintf function is a useful general tool for converting data to string: s := fmt.Sprintf("%+8d", 97) // s == " +97" (width 8, right justify, always show sign) See this fmt cheat sheet for more about formatting integers and other types of data with the fmt package. Package strconv · golang.org ·
GitHub
github.com › golang › protobuf › issues › 1414
protojson: Add MarshalOption to write int64 as a number and not as a string · Issue #1414 · golang/protobuf
February 17, 2022 - So right now our organization is between a hard rock and a stone; Either omit default values (such as 0 and false) or write int64 as strings (and breaking other tools that reads in JSON data).
Author corgrath
Stackademic
blog.stackademic.com › a-beginner-friendly-guide-to-type-conversions-in-golang-d2d3aad51db2
A Beginner-Friendly Guide to Type Conversions in Golang | by Thomas Langhorst | Stackademic
November 11, 2024 - The function strconv.FormatInt() takes two arguments. The first is the int64 value and the second is the base. In our example, we converted the integer value of 42 to the binary string representation 101010.
Medium
irshadhasmat.medium.com › golang-string-to-int-int64-conversion-and-int-int64-to-string-conversion-774f9f23cb03
GoLang : String to Int & Int64 Conversion and Int & int64 to String Conversion | by Mohammed Irshad | Medium
June 15, 2018 - To convert Int64 to String we have to use strconv.FormatInt(int64, 10) function.
Golang.cafe
golang.cafe › blog › golang-int-to-string-conversion-example
Golang Int To String Conversion Example | Golang.cafe
April 27, 2022 - Let’s see an example on how we can use these functions to convert an integer to an ASCII string · package main import ( "fmt" "strconv" ) func main() { i := 10 s1 := strconv.FormatInt(int64(i), 10) s2 := strconv.Itoa(i) fmt.Printf("%v, %v\n", s1, s2) }
Go Packages
pkg.go.dev › net › http
http package - net/http - Go Packages
Say hi: ") bufrw.Flush() s, err := bufrw.ReadString('\n') if err != nil { log.Printf("error reading string: %v", err) return } fmt.Fprintf(bufrw, "You said: %q\nBye.\n", s) bufrw.Flush() }) } Output: Share Format Run · type MaxBytesError struct { Limit int64 } MaxBytesError is returned by MaxBytesReader when its read limit is exceeded.
GitConnected
levelup.gitconnected.com › golang-convert-int-to-string-how-senior-developers-do-it-right-168f4d1f60b6
Golang Convert Int to String: How Senior Developers Do It Right
August 7, 2025 - Get expert insights on how to use Golang convert int to string, including tips for better performance and cleaner code
Sentry
sentry.io › sentry answers › go › converting an int to a string in go
Converting an Int to a String in Go | Sentry
October 15, 2024 - For example, you can use the FormatInt function to convert an integer to a binary string by passing in the integer and base 2: package main import ( "fmt" "strconv" ) func main() { i := int64(123) fmt.Println(strconv.FormatInt(i, 2)) } This ...