如何编写同时包含字符串和双精度类型的方法？ 应该是void还是返回类型方法？

Question

Basically, I want my method to contain(?) both string and double type. But I don't know how to declare the method, I actually want both as a return type. It gives me an error if I declare it as a double or as a string.

This is not my original code but it is just an example and a short cut.

This method should print two strings and sum three doubles and print the total of the sum.

public static double MethodName ( string A, string B, double n1, double n2, double n3)

{
   double sum;    
   Console.Write(A);    
   Console.Write(B);    
   sum= n1+n2+n3;    
}

Answer 1

public static Tuple<string, double> MethodName ( string A, string B, double n1, double n2, double n3)
{
   double sum;

   Console.Write(A);

   Console.Write(B);

   sum= n1+n2+n3;

   return new Tuple<string, double>("yourString", sum);
}

You can use Tuple

After that you are taking your values like this:

Tuple<string, double> result = MethodName(a,b,n1,n2,n3);
string yourString = result.Item1;
double yourDouble = result.Item2;

Answer 2

I think your problem is that you're not returning anything from the function even tho compiler is expecting so as you've defined your function as returning double. In case you want to your last line should be something like

...
return sum;
}

or if you want it one line shorter then

...
return n1+n2+n3;
}

Class declaration is fine if you only want to return double value.

EDIT: In case you want only to write out the sum, change return type to void

public static void MethodName ( string A, string B, double n1, double n2, double n3)

Otherwise you're making compiler expect something to be returned from your function.

Answer 3

public void MethodName (string A, string B, double n1, double n2, double n3)
{
    double sum = n1 + n2 + n3;

    Console.WriteLine(A);
    Console.WriteLine(B);
    Console.WriteLine(sum.ToString());
}

Does exactly what your question asks - Prints the 2 strings, then the sum of the 3 numbers.