50 lines
893 B
Go
50 lines
893 B
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"strconv"
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)
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var usage string = "usage: " + os.Args[0] + " <number of fibs>"
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// fibonacci is a function that returns
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// a function that returns an int.
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// from cpython/Doc/build/html/library/functools.html
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// [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]
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func fibonacci() func() uint64 {
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cur_fib := uint64(0)
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nxt_fib := cur_fib
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return func() uint64 {
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if nxt_fib == 0 {
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nxt_fib = 1
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return 0
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}
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tmp := cur_fib
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cur_fib = nxt_fib
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nxt_fib += tmp
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if nxt_fib < cur_fib {
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panic("overfull!!")
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}
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return cur_fib
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}
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}
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func main() {
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flag.Parse()
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if len(flag.Args()) != 1 {
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fmt.Fprintln(os.Stderr, usage)
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os.Exit(1)
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}
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count, err := strconv.Atoi(flag.Arg(0))
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s\n", err.Error())
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os.Exit(1)
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}
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f := fibonacci()
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for i := 0; i < count; i++ {
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fmt.Println(f())
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}
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}
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