大家好！我是一个V#的初学者，现在正在拜读周靖老师翻译的《Visual c#2010从入门到精通》这本书，其中一个例子让我这个门外汉有点匪夷所思，例子如下：
十进制转成八进制
        private void showStepsClick(object sender, RoutedEventArgs e)
        {
            int amount = int.Parse(number.Text);
            steps.Text = "";
            string current = "";
            do
            {
                int nextDigit = amount % 8;
                amount /= 8;
                int digitCode = '0' + nextDigit;
                char digit = Convert.ToChar(digitCode);
                current = digit + current;
                steps.Text += current + "\n";
            }
            while (amount != 0);
        }
让我匪夷所思的是这两句：
int digitCode = '0' + nextDigit;
char digit = Convert.ToChar(digitCode);
后来我自己修改了一下，调试后一切正常：
        private void showStepsClick(object sender, RoutedEventArgs e)
        {
            int amount = int.Parse(number.Text);
            steps.Text = "";
            string current = "";
            do
            {
                int nextDigit = amount % 8;
                amount /= 8;
                string digit = nextDigit.ToString();
                current = digit + current;
                steps.Text += current + "\n";
            }
            while (amount != 0);
        }
请大家给我一个提示，为什么一定要加这两句，谢谢!

不想让它沉下去，这个对初学者来说很重要。

把数字转换成ASCII码