package main
import "fmt"
func isPrime(n int) bool {
if n < 2 {
return false
}
// Try dividing by all numbers from 2 to sqrt(n).
for i := 2; i*i <= n; i++ {
if n % i == 0 {
return false
}
}
// If we get here, we didn't find a factor, so n is prime.
return true
}
func main() {
var name string
fmt.Print("What is your name? ")
fmt.Scanln(&name)
fmt.Println("Hello, " + name + "!")
var number int
fmt.Print("What is your favorite number? ")
fmt.Scanln(&number)
fmt.Print("Your favorite number is ", number)
if isPrime(number) {
fmt.Println(", and that's a prime number!")
} else {
fmt.Println(". It's not a prime number, but that's okay!")
}
}
