C#求长方体体积

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 体积
{
    class Program
    {
        static void Main(string[] args)
        {
            double tj,a,b,c;
            Console.WriteLine("请输入第一个数字：");
            a = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("请输入第二个数字：");
            b = Convert.ToDouble(Console.ReadLine());
            Console.WriteLine("请输入第三个数字：");
            c = Convert.ToDouble(Console.ReadLine());
            tj = tiji(a,b,c);
            Console.WriteLine("体积为："+tj);
        }

        public static double tiji(double x,double y,double z)
        {
            double v;
            v = x * y * z;
            return v;
        }
    }
}