c# 怎么将在主函数中输入的值用在函数中

我这个函数没走一次就得重新输入一次，怎么把输入放在主函数里然后函数去获取那个值 或者有别的解决办法吗？

 public static double tuoqiu()
        {
            Console.WriteLine("请选择椭球类型：");
            Console.WriteLine("如果为克拉索夫斯基椭球请输入1");
            Console.WriteLine("如果为IAG-75椭球请输入2");
            Console.WriteLine("如果为WGS-84椭球请输入3");
            Console.WriteLine("如果为CGCS2000椭球请输入4");
            string tuoqiu = Console.ReadLine();
            int temp = int.Parse(tuoqiu);
            double f=0;
            switch (temp)
            {
                case 1: f = 1 / 298.3; break;
                case 2: f = 1 / 298.257; break;
                case 3: f = 1 / 298.257223563; break;
                case 4: f = 1 / 298.257222101; break;
            }
            return f;
 
        }

        static void Main(string[] args)
        {
            Console.WriteLine("请选择椭球类型：");
            Console.WriteLine("如果为克拉索夫斯基椭球请输入1");
            Console.WriteLine("如果为IAG-75椭球请输入2");
            Console.WriteLine("如果为WGS-84椭球请输入3");
            Console.WriteLine("如果为CGCS2000椭球请输入4");
            string tuoqiu = Console.ReadLine();
            int temp = int.Parse(tuoqiu);
            
            Console.WriteLine(tuoqiu(temp));
    
        }
        
        public static double tuoqiu(int temp){
            double f=0;
            switch (temp)
            {
                case 1: f = 1 / 298.3; break;
                case 2: f = 1 / 298.257; break;
                case 3: f = 1 / 298.257223563; break;
                case 4: f = 1 / 298.257222101; break;
            }
            return f;
        }

你可以这样写：

        public static double tuoqiu(int temp)
        {
            double f = 0;
            switch (temp)
            {
                case 1: f = 1 / 298.3; break;
                case 2: f = 1 / 298.257; break;
                case 3: f = 1 / 298.257223563; break;
                case 4: f = 1 / 298.257222101; break;
            }
            return f;
        }
        public static double GetE2(int f)
        {
            return 2 * f - f * f;
        }

使用时：

            Console.WriteLine("请选择椭球类型：");
            Console.WriteLine("如果为克拉索夫斯基椭球请输入1");
            Console.WriteLine("如果为IAG-75椭球请输入2");
            Console.WriteLine("如果为WGS-84椭球请输入3");
            Console.WriteLine("如果为CGCS2000椭球请输入4");
            string str = Console.ReadLine();
            int temp = int.Parse(str);

            int f = tuoqiu(temp);
            int result = GetE2(f);