golang use rational numbers example

rat.go

package main

import "math/big"
import "fmt"
import "time"

func main() {
	fmt.Printf("Hello, world.\n")
    start := time.Now()

      	r := new(big.Rat)
	for i := 0; i < 10000000; i++ {
		r.Add(r, big.NewRat(1, 1))
	}
    elapsed := time.Since(start)

    fmt.Printf(" took %s %d", elapsed, r)
}