In Golang, to convert string to int you can use strconv.Atoi(s) and strconv.ParseInt(s, base, bitSize). Lets walk through this tutorial to see the examples in practice

Convert string to int with strconv.Atoi(s)

  • You can use strconv.Atoi(s) to convert a string s to a 32 bit integer. Atoi stands for ASCII to integer
package main

import (  
    "fmt"
    "strconv"
)

func main() {  
    str := "1"

    n, _ := strconv.Atoi(str)
    fmt.Println(n)
}

Output

1
  • If the input string isn't in the integer format, you would get the zero value in return
package main

import (  
    "fmt"
    "strconv"
)

func main() {  
    str := "1.9"

    n, _ := strconv.Atoi(str)
    fmt.Println(n)
}

Output

0
  • Beside returns integer value, strconv.Atoi(s) also returns an error in case the converting isn't successful
package main

import (  
    "fmt"
    "strconv"
)

func main() {  
    str := "1a"

    n, err := strconv.Atoi(str)

    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(n)
    }
}

Output

strconv.Atoi: parsing "1a": invalid syntax

Convert string to int with strconv.ParseInt(s, base, bitSize)

The strconv.ParseInt(s, base, bitSize) convert the given string s to an integer in the given base (0,2 to 36) and bit size (0 to 64)

Atoi(s) is equivalent to Parseint(s, 10, 0)

Output

9
Golang