// ==========================================================================
// $Id: lettersnumbers.go,v 1.1 2014/04/02 20:51:53 jlang Exp $
// CSI2120 GO: Concurrency
// ==========================================================================
// (C)opyright:
//
//   Jochen Lang
//   EECS, University of Ottawa
//   800 King Edward Ave.
//   Ottawa, On., K1N 6N5
//   Canada. 
//   http://www.eecs.uottawa.ca
// 
// Creator: Jochen Lang (based on example by R. Laganiere)
// Email:   jlang@eecs.uottawa.ca
// ==========================================================================
// $Log: lettersnumbers.go,v $
// Revision 1.1  2014/04/02 20:51:53  jlang
// Created the concurrency examples
//
// ==========================================================================
package main

import ( 
	"fmt"
	"runtime"
	"time"
)


func main() {
	runtime.GOMAXPROCS(3)
	sTime := time.Now(); // time it
	fmt.Println("Starting")
	go letters() // goroutine A 
	go numbers() // goroutine B
/*
	// without concurrency
	letters()
	numbers()
*/
	fmt.Println("Waiting ...")
	time.Sleep(2*time.Second)
	fmt.Println("\nDone\n")
	eTime := time.Now();
	fmt.Printf("Run time: %s", eTime.Sub(sTime))
}

func numbers() {
	for number := 1; number < 27; number++ {
		// pause before every print
		time.Sleep(10*time.Millisecond) 
		fmt.Printf("%d ", number)
	}
}

func letters() {
	for char := 'a'; char < 'a'+26; char++ {
		time.Sleep(10)
		fmt.Printf("%c ", char)
	}
}