GoLang Examples - Convert Int to String type tutorials


In this blog post, We are going to learn how String conversion from Int type in go language with examples.

Golang cast int, String

¬† ¬† In Any programming language, Anything user entered in text fields always considered as String and saved to Database as Integer. you check my other post on Convert String to Int type. In some cases, we need to convert this Integer to String. For example, the integer contains numbers 167 and will convert this int to string as ‚Äú167‚ÄĚ.

    String and int are primitive data types in Go language. Int is general data type to hold numeric values. The string is a group of characters enclosed in double quotes. In Go Language, Compiler will not cast Primitive conversions implicitly like Int to String conversions. The developer needs to write a code handle this.

Thanks to Standard strconv package from Golang. strconv is a go standard inbuilt in a package that provides String conversions to or from other data types like int, float and boolean. You can check my other posts on String to/from Boolean  

Golang Convert  Int type to String

With strconv standard package, It is very easy to convert Int to String.strconv package provides various implementations

There are 3 ways to convert Integer type to a string in Go language.

  • strconv FormatInt function
  • strconv Itoa function
  • fmt sprintf format example

strconv FormatInt function example 

strconv FormatInt() function takes input values - integer value and base number and returns number represented string value. You can check complete post on strconv FormatInt example

Here is the syntax of this

func FormatInt(input int64, base int) string  

Parameters to this function

input - actual number to convert to a string type

base - base value from 2 to 36.

Return values from this function

returned a represented numeric string value 

Here is a complete example of FormatInt

package main  
  
import (  
 "fmt"  
 "strconv"  
)  
  
func main() {  
 input := int64(58)  
 fmt.Printf("type=%T, output=%v\n", input, input)  
 s0 := strconv.FormatInt(input, 2)  
 fmt.Printf("type=%T, output=%v\n", s0, s0)  
 s1 := strconv.FormatInt(input, 10)  
 fmt.Printf("type=%T, output=%v\n", s1, s1)  
 s2 := strconv.FormatInt(input, 16)  
 fmt.Printf("type=%T, output=%v\n", s2, s2)  
}  
  

Output is

type=int64, output=58  
type=string, output=111010  
type=string, output=58  
type=string, output=3a  

strconv Itoa function example 

strconv.Itoa() function is simple form FormInt equal to FormatInt(int64(i), 10) function. This takes an Integer value and return string type value Here is a syntax of Itoa function

func Itoa(i int) string 

Following is a complete example of Itoa function

package main  
  
import (  
 "fmt"  
 "reflect"  
 "strconv"  
)  
  
func main() {  
 var input = 20  
 output := strconv.Itoa(input)  
 fmt.Println(output)  
 fmt.Println("Input type: ", reflect.TypeOf(input))  
 fmt.Println("Output type", reflect.TypeOf(output))  
  
}  

When the above program is compiled and executed, The output is as follows

A:\Golang\work>go run Test.go  
20  
Input type:  int  
Output type string  

fmt Sprintf function example 

package fmt Sprintf() function which accepts any value argument and converts to string type and finally returned.
Here is a syntax of Sprintf() function

func Sprintf(format string, input ...interface{}) string 

It accepts two parameters- format string with %v and input - any value

package main  
  
import (  
 "fmt"  
 "reflect"  
)  
  
func main() {  
 var input = 20  
 output := fmt.Sprintf("%v", input)  
 fmt.Println(output)  
 fmt.Println("Input type: ", reflect.TypeOf(input))  
 fmt.Println("Output type", reflect.TypeOf(output))  
  
}  

output is

20  
Input type:  int  
Output type string  

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