39 lines
521 B
Go
39 lines
521 B
Go
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package main
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import (
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"fmt"
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"os"
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"strconv"
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)
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const USAGE string = `Usage: algs4-gcd <int> <int>`
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func gcd(p, q uint64) uint64 {
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if q == 0 {
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return p
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}
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r := p % q
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return gcd(q, r)
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}
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func main() {
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if len(os.Args) < 3 {
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fmt.Println(USAGE)
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os.Exit(1)
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}
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p, err := strconv.ParseUint(os.Args[1], 10, 0)
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if err != nil {
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fmt.Println("Wherps: ", err)
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os.Exit(1)
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}
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q, err := strconv.ParseUint(os.Args[2], 10, 0)
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if err != nil {
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fmt.Println("Wherps: ", err)
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os.Exit(1)
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}
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fmt.Println(gcd(p, q))
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}
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