number-parsing.go

package main
The built-in package strconv provides the number parsing.
import "strconv"
import "fmt"
func main() {
// With ParseFloat, this 64 tells how many bits of precision to parse.
    f, _ := strconv.ParseFloat("1.234", 64)
    fmt.Println(f)
// For ParseInt, the 0 means infer the base from the string. 64 requires that the result fit in 64 bits.
    i, _ := strconv.ParseInt("123", 0, 64)
    fmt.Println(i)
// ParseInt will recognize hex-formatted numbers.
    d, _ := strconv.ParseInt("0x1c8", 0, 64)
    fmt.Println(d)
// A ParseUint is also available.
    u, _ := strconv.ParseUint("789", 0, 64)
    fmt.Println(u)
// Atoi is a convenience function for basic base-10 int parsing.
    k, _ := strconv.Atoi("135")
    fmt.Println(k)
// Parse functions return an error on bad input.
    _, e := strconv.Atoi("wat")
    fmt.Println(e)
}