• strconv.Atoi: Atoi returns the result of ParseInt(s, 10, 0) converted to type int.
• strconv.ParseInt: ParseInt interprets a string s in the given base (2 to 36) and returns the corresponding value i.

package main
import (
    "fmt"
    "strconv"
)
func main() {
    str1 := "123"
    /** converting the str1 variable into an int using Atoi method */
    i1, err := strconv.Atoi(str1)
    if err == nil {
        fmt.Println(i1)
    }
    str2 := "456"
    /** converting the str2 variable into an int using ParseInt method */
    i2, err := strconv.ParseInt(str2, 10, 64)
    if err == nil {
        fmt.Println(i2)
    }
}