test.go

package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	var t int

	for {
		inp := bufio.NewReader(os.Stdin)
		fmt.Scanln(&t, inp)

		if t < 0 || t > 99 || t == 42 {
			break
		} else {
			fmt.Printf("%d\n", t)
		}
	}
}