main.go

package main

import (
	"fmt"
	"math/rand"
	"time"
)

const (
	max   = 100 + 1
	tries = max * 100000
)

func main() {
	rand.Seed(time.Now().UnixNano())
	m := make(map[int]int)
	for i := 0; i < tries; i++ {
		j := rand.Intn(max)
		m[j]++
	}
	for k, v := range m {
		fmt.Printf("%5d: %f%%\n", k, float64(v)/tries*100)
	}
}