using System namespace Calc class BigNumber private string num public

using System;

namespace Calc
{
    class BigNumber
    {
        private string num = "";

        public BigNumber(string inputNum)
        {
            this.num = inputNum;
        }

        public static long operator *(BigNumber firstNum, BigNumber secondNum)
        {
            return (long)firstNum * (long)secondNum;
        }

        public static double operator /(BigNumber firstNum, double secondNum)
        {
            return (double)firstNum / secondNum;
        }

        public static explicit operator long(BigNumber Number)
        {
            long lNum = long.Parse(Number.num);

            return lNum;
        }

        public static explicit operator double(BigNumber Number)
        {
            double dNum = double.Parse(Number.num);

            return dNum;
        }

    }
}