pragprog.com/rggo/firstProgram/wc/main.go

package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

func main() {
	// Calling the count function to count the number of words
	// received from the standard input and printing it out
	fmt.Println(count(os.Stdin))
}

func count(r io.Reader) int {
	scanner := bufio.NewScanner(r)
	// Split sets the split function for the Scanner.
	// The default split function is ScanLines.
	scanner.Split(bufio.ScanWords)
	wc := 0
	// For every word scanned, increment the counter
	for scanner.Scan() {
		wc++
	}
	return wc
}