go test

gotest.go

package main

import "fmt"
import "time"

func main() {
    var values [32000000]float64
    for i := 0; i < len(values); i++ {
        values[i] = 2.0
    }

    for j := 0; j < 10; j++ {
        start := time.Now().UnixNano()
        sum := 0.0
        for i := 0; i < len(values); i++ {
            v := values[i]
            sum = sum +  v*v
        }
        end := time.Now().UnixNano()

        fmt.Printf("forloop sum %f time: %d\n",sum, (end-start)/1000000)

        start = time.Now().UnixNano()
        sum = 0.0
        for _,v := range values {
            sum = sum +  v*v
        }
        end = time.Now().UnixNano()

        fmt.Printf("range sum %f time: %d\n",sum, (end-start)/1000000)
    }
}