Golang : Generate random integer or float number

Was helping out a friend last Sunday to finish up his Golang project and encounter a problem where we need to generate random integer or float number. Below is a snippet of the code that we used to generate the random numbers. Hope this can be useful to your work/project as well.

 package main

 import (

 func randSeed() (p []byte) {
 for i := 0; i < 10; i++ {
 p = append(p, byte(rand.Intn(512)))

 func main() {

 b := randSeed()


In case you are looking for random float number. This should do the trick :

 fmt.Println(rand.Float64()) // rand.Float64 returns a float64 value f ...  between  0.0 <= f < 1.0.

and if 0.0 to 1.0 is not what you wanted. You can tweak it to become in between 5.0 <= f < 10.0 with is this line

 fmt.Print((rand.Float64() * 5) + 5)

Reference :


  See also : Generate Random number with math/rand in Go

By Adam Ng

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