First Program Part II

main.go

package main

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

func main() {
	var n int
	var ug string
	var g int
	var c int
	var maxg int = 10
	var maxnum int = 100
	flag.IntVar(&maxg, "guess", 10, "Number of guesses to win.  Default value is 10.")
	flag.IntVar(&maxnum, "maxnum", 100, "Maxium value the number to guess can be.  Default value is 100.")
	flag.Parse()
	rand.Seed(int64(time.Now().Nanosecond()))
	n = rand.Intn(maxnum)
	for {
		var inputError error
		fmt.Printf("Enter your guess: ")
		fmt.Scanln(&ug)
		c = c + 1
		g, inputError = strconv.Atoi(ug)
		if inputError != nil {
			fmt.Println("Not a number:", ug)
			fmt.Println("Try again.")
			continue
		}
		maxg = maxg - 1
		if g == n {
			fmt.Println("You guessed it!")
			fmt.Println("No. Guesses: ", c)
			break
		} else if g > n {
			fmt.Println("Too high.")
		} else {
			fmt.Println("Too low.")
		}
		if maxg == 0 {
			fmt.Println("Out of guesses.  Better luck next time.")
			break
		}
		fmt.Println("You have", maxg, "guesses remaning.")
		fmt.Println("")
	}
}