Golang简单用户输入产品数学问题，例如3 * 2 * 1 = 6

Question

I'm trying to create a small program that allows a user to input an integer which will output the product such as follows:

For example:

a = 5, 5*4*3*2 = 120
a = 4, 4*3*2*1 = 24  
a = 3, 3*2*1 = 6

Can someone provide guidance as I'm stuck on how to frame this more efficiently. If using Python, I would probably write the logic something like:

def a(num):
    x = 1
    for i in range (num):
            x=x*(i + 1)
    return x

print a(5)

Answer 1

You need to learn about the go language itself first, after that you'll be able to convert your python code into go, easily.

Few go learning resources:

• https://tour.golang.org
• https://gobyexample.com
• https://golang.org/doc

---

But anyway, here is the go version of your python code:

func a(num int) int {
    x := 1
    for i := 0; i < num; i++ {
        x = x * (i + 1)
    }
    return x
}

func main() {
    fmt.Println(a(5)) // 120
    fmt.Println(a(4)) // 24
    fmt.Println(a(3)) // 6
}

Working playground: https://play.golang.org/p/glHwuMhTDYj