如何在Go中计算随机数？ [关闭]

package main

import "fmt"

import "math/rand"

func main() {

    var milesdriven float64
    var enginerunningloud bool = true
    var changeoil bool = true

    if milesdriven >= 3000.0 || enginerunningloud == false {

        float64 := (milesdriven * Rand)
        changeoil = true
        fmt.Println("Change that oil duuuuuude")

    }

}

This is what I have so far but I keep getting imported and not used "math/rand" and also a undefined Rand what does that mean? And what should I do?

See the math/rand package documentation for how to generate random numbers. e.g.:

package main

import "math/rand"
import "time"

func main() {
  seed := time.Now().UnixNano()
  random := rand.New(rand.NewSource(seed))
  println(random.Float64()) // => +8.277637e-001
  println(random.Int())     // => 7112143871403206581
  // etc.
}