nextprime.go

package main

import (
    "os"
    "fmt"
    "log"
    "strconv"
    "github.com/cznic/mathutil"
)

func main() {
    i, err := strconv.ParseUint(os.Args[1], 0, 64)
    if err != nil {
        log.Fatal("Could not parse number: \"", os.Args[1], "\"")
    }
    prime, ok := mathutil.NextPrimeUint64(i)
    if !ok {
        log.Fatal("Could not find next prime for: ", i)
    }
    fmt.Println(prime)
}