56 lines
800 B
Go
56 lines
800 B
Go
// For more tutorials: https://blog.learngoprogramming.com
|
|
//
|
|
// Copyright © 2018 Inanc Gumus
|
|
// Learn Go Programming Course
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
|
//
|
|
|
|
// go run . {1..100}
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"strconv"
|
|
)
|
|
|
|
func main() {
|
|
// remember [1:] skips the first argument
|
|
|
|
main:
|
|
for _, arg := range os.Args[1:] {
|
|
n, err := strconv.Atoi(arg)
|
|
if err != nil {
|
|
// skip non-numerics
|
|
continue
|
|
}
|
|
|
|
switch {
|
|
// prime
|
|
case n == 2 || n == 3:
|
|
fmt.Print(n, " ")
|
|
continue
|
|
|
|
// not a prime
|
|
case n <= 1 || n%2 == 0 || n%3 == 0:
|
|
continue
|
|
}
|
|
|
|
for i, w := 5, 2; i*i <= n; {
|
|
// not a prime
|
|
if n%i == 0 {
|
|
continue main
|
|
}
|
|
|
|
i += w
|
|
w = 6 - w
|
|
}
|
|
|
|
// all checks ok: it's a prime
|
|
fmt.Print(n, " ")
|
|
}
|
|
|
|
fmt.Println()
|
|
}
|