RollerCoaster (CodeEval) in go

main.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"unicode"
)

func main() {
	file, err := os.Open(os.Args[1])
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		//'scanner.Text()' represents the test case, do something with it
		var line string = scanner.Text()

		var upper_flg bool = true
		for _, r := range line {
			if unicode.IsLetter(r) {
				if upper_flg {
					fmt.Printf("%c", unicode.ToUpper(r))
				} else {
					fmt.Printf("%c", unicode.ToLower(r))
				}
				upper_flg = !upper_flg

			} else {
				fmt.Printf("%c", r)
			}

		}
		fmt.Print("\n")
	}
}