nearest.go

package main

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

func main() {

    rand.Seed(time.Now().UnixNano())

    score := 0
    total := 0

    c := make(chan os.Signal, 1)
    signal.Notify(c, os.Interrupt)

    go func() {
        for range c {
            fmt.Printf("\n\nYou got %d out of %d \n", score, total)
            os.Exit(0)
        }
    }()

    for {

        answer := rand.Intn(999-1) + 1

        var nearest int
        if rand.Intn(2) == 1 {
            nearest = 10
        } else {
            nearest = 100
        }

        // 1. Prompt
        fmt.Printf("Enter your guess for %d (nearest %d): ", answer, nearest)

        // 2. Read input
        var guess int
        fmt.Scanf("%d", &guess)

        // 3. Processing
        tmp1 := ((answer / nearest) + 1) * nearest
        tmp2 := (answer / nearest) * nearest

        var result int
        if (tmp1 - answer) > (answer - tmp2) {
            result = tmp2
        } else {
            result = tmp1
        }

        // 4. Output
        if result == guess {
            score++
            fmt.Println("herray! you are correct")
        } else {
            fmt.Printf("Ohh! the result is: %d", result)
        }
        total++
        fmt.Println("----------------")
    }
}