import std.console.*

main() {
    println("The characters you entered will be returned as is. Enter q to exit:")
    try {
        //读取一个字符
        var ch = Console.stdIn.read().getOrThrow()

        //判断输入的是否是字符q,如果是就退出，否则继续循环
        while (ch != 'q') {
            //输入的字符是不是换行，如果不是就打印该字符
            if (ch != '\n') {
                println(ch)
            }

            //重新读取一个字符
            ch = Console.stdIn.read().getOrThrow()
        }
    } catch (e: Exception) {
        println("An error occurred:" + e.message)
    }
}