stringgoint64

Golang converting string to int64

I want to convert a string to an int64. What I find from the strconv package is the Atoi function. It seems to cast a string to an int and return it:

// Atoi is shorthand for ParseInt(s, 10, 0).
func Atoi(s string) (i int, err error) {
        i64, err := ParseInt(s, 10, 0)
    return int(i64), err
}

The ParseInt actually returns an int64:

func ParseInt(s string, base int, bitSize int) (i int64, err error){
     //...
}

So if I want to get an int64 from a string, should I avoid using Atoi, instead use ParseInt? Or is there an Atio64 hidden somewhere?

Solution

  • 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