package main import (	"os"	"flag"	"fmt"	"strconv")  var pad = flag.Bool("w", false, "Equalize the widths of all numbers by padding with leading zeros as necessary.")var format = flag.String("f", "%g", "Use the print(3)-style format for printing each number.")  func main() { 	flag.Usage = usage	flag.Parse()	args := flag.Args()		firsts := "1"	incrs := "1"	var lasts string	switch len(args) {	case 1:		lasts = args[0]	case 2: 		incrs = args[0]		lasts = args[1]	case 3:		firsts = args[0]		incrs = args[1]		lasts = args[2]	default:		usage()	}		first, err := strconv.ParseFloat(firsts, 64)	if err != nil {		fail(err)	}	incr, err := strconv.ParseFloat(incrs, 64)	if err != nil {		fail(err)	}	last, err := strconv.ParseFloat(lasts, 64)	if err != nil {		fail(err)	}		if incr == 0 {		fmt.Fprintf(os.Stderr, "seq: a zero increment will take you nowhere!\n")	}  	f := *format+"\n" 	/* TODO	if pad {		maxi := 0		for c := first; c <= last; c += incr {			maxl = len(fmt.Sprintf("%g", c))		}	} */	if incr > 0 {		for c := first; c <= last; c += incr {			fmt.Printf(f, c)		}	} else {		for c := first; c >= last; c += incr {			fmt.Printf(f, c)		}	} }  func fail(err error) {	fmt.Fprintf(os.Stderr, "%s\n", err)	os.Exit(2)} func usage() {	fmt.Print("usage: seq [-fformat] [-w] [first [incr]] last")	flag.PrintDefaults()	os.Exit(2)}