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   源码介绍

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   switch (aa)
            {
                case "香港":
                    float a;
                    a = float.Parse(textBox1.Text);
                    // textBox1.Text = a.ToString();
                    if (a <= 1)
                    {
                        label3.Text = "30";
                    }
                    else if (a > 1)
                    {
                        float b = a % 1;
                        float c = a - b;
                        if (b <= 0.5)
                        {
                            double res;
                            if (b == 0)
                            {

                                res = (c - 1) * 25 30;
                                label3.Text = res.ToString();
                            }
                            else
                            {
                                res = (c - 1) * 25 30 12.5;
                                label3.Text = res.ToString();
                            }

                        }
                        else if (b > 0.5)
                        {
                            double res;
                            res = c * 25 30;
                            label3.Text = res.ToString();
                        }
                    }

                    break;