93 lines
2.2 KiB
Go
93 lines
2.2 KiB
Go
/*
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Copyright © 2025 filifa
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package cmd
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import (
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"fmt"
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"log"
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"math/big"
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"github.com/spf13/cobra"
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)
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var extended bool
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func computeBezouts(bezouts []big.Int, x, y *big.Int) {
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for i, b := range bezouts {
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if i == len(bezouts)-1 {
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bezouts[i].Set(y)
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} else {
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bezouts[i].Mul(&b, x)
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}
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}
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}
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func gcd(cmd *cobra.Command, args []string) {
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x := new(big.Int)
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y := new(big.Int)
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z := new(big.Int)
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w := new(big.Int)
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bezouts := make([]big.Int, len(args))
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for i, s := range args {
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_, ok := w.SetString(s, 10)
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if !ok {
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log.Fatal("invalid input " + s)
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}
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z.GCD(x, y, z, w)
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if extended {
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computeBezouts(bezouts[:i+1], x, y)
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}
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}
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fmt.Print(z)
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if extended {
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for _, b := range bezouts {
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fmt.Printf(" %s", &b)
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}
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}
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fmt.Println()
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}
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// gcdCmd represents the gcd command
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var gcdCmd = &cobra.Command{
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Use: "gcd N N [N ...]",
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Short: "Compute the greatest common denominator of a set of numbers",
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Long: `Compute the greatest common denominator of a set of numbers.`,
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Args: cobra.MinimumNArgs(2),
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Run: gcd,
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}
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func init() {
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rootCmd.AddCommand(gcdCmd)
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// Here you will define your flags and configuration settings.
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// Cobra supports Persistent Flags which will work for this command
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// and all subcommands, e.g.:
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// gcdCmd.PersistentFlags().String("foo", "", "A help for foo")
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// Cobra supports local flags which will only run when this command
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// is called directly, e.g.:
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// gcdCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
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gcdCmd.Flags().BoolVarP(&extended, "extended", "e", false, "also compute the Bezout coefficients")
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}
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