go goroutine实现素数统计的示例

package main
import (
	"fmt"
	"sync"
)
var wg sync.WaitGroup
func main() {
	fmt.Println("begin for goroutine")
	for i := 1; i < 5; i++ {
		wg.Add(1)
		go CheckFor(i)
	}
	wg.Wait()
	fmt.Println("this script done!!!!!!!!!")
}
func CheckFor(n int) {
	defer wg.Done()
	for i := (n-1)*30000 + 1; i < n*30000; i++ {
		flag := true
		for j := 2; j < i-1; j++ {
			if i%j == 0 {
				flag = false
			}
		}
		if flag {
			fmt.Printf("%d是素数！！！！！！！！！！！！\n", i)
		}
	}
}