A cli tool to generate Fibonacci numbers.

main.go

// A cli tool to generate Fibonacci numbers.
package main

import "fmt"

func main() {
	var a, b uint64 = 0, 1

	for a <= b {
		fmt.Println(a)
		a, b = b, a+b
	}

	// don't miss the last number in the sequence before overflowing uint64
	fmt.Println(a)
}