go语言for循环的三种写法

func main() {

a := []string{}

a = append(a, "hello")

a = append(a, ", ")

a = append(a, "world")

fmt.Println(a)

for i := 0; i < len(a); i++ {
        fmt.Println(a[i])
}

for _, aa := range a {
        aa += "@"
        fmt.Println(aa)
}
for i :=0;i<len(a);i++ {
        a[i] += "@"
        fmt.Println(a[i])
}
fmt.Println(a)

}

打印99 乘法表

func main()  {
        for i :=1;i<=9;i++{
                for j:=1;j<=i;j++{
                        fmt.Printf("%d*%d=%d  ",i,j,i*j)
                }
                fmt.Println()
        }
}