C# '；Program.CalculateAX（双精度）和#x27；：并非所有代码路径都返回值'；

我在这个代码上有错误。它说“并非所有代码路径都返回值” 请帮我修一下这个。谢谢

public static double subtotal;

public static void Main(String[] args)
{
  subtotal = 15.00;
  Console.WriteLine($"Subtotal : {subtotal}");

  double total = subtotal + CalculateTax(7);
  Console.WriteLine($"Total : {total}");
}

public static double CalculateTax(double taxRate)
{
  double tax = subtotal * taxRate;
  Console.WriteLine($"Tax: {tax}");
}

试试这个

public static double CalculateTax(double taxRate)
{
    double tax = subtotal * taxRate;
    Console.WriteLine($"Tax: {tax}");
    return tax;
}

试试这个

public static double CalculateTax(double taxRate)
{
    double tax = subtotal * taxRate;
    Console.WriteLine($"Tax: {tax}");
    return tax;
}

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添加

返回税

在方法末尾添加

返回税到方法的末尾