C# 快递费用计算软件 源码

代码说明：

     switch (aa)            {                case "香港":                    float a;                    a = float.Parse(textBox1.Text);                    // textBox1.Text = a.ToString();                    if (a 1)                    {                        float b = a % 1;                        float c = a - b;                        if (b 0.5)                        {                            double res;                            res = c * 25 30;                            label3.Text = res.ToString();                        }                    }                     break;