GO：处理随机生成的float64

Question

I was wondering if we can specify to the random generator to how many numbers should be generated after the point decimal?

Example of default behaviour:

fmt.Println(rand.float64())

Would print out the number 0.6046602879796196

Desired behaviour:

fmt.Println(rand.float64(4))

Would then print out the number 0.6047.

Does this functionality already exist in GO or would I have to implement it myself ?

Thank you!

Answer 1

It sounds like only the string representation is important to you, and the fmt package does provide that for you:

fmt.Printf("%1.4f", rand.Float64())

So yes, you would still need to wrap this call to specify the number of digits after the decimal point.

func RandomDigits(number int) string {
    return fmt.Sprintf("%1." + strconv.Itoa(number) + "f", rand.Float64())
}