public static MyBigNumber Sum2MyBigNumbers(MyBigNumber myNmbr1, MyBigNumber myNmbr2)
        {
            int         smallerByAbs = MyBigNumber.SmallerByAbsIsFirstOrSecond(myNmbr1, myNmbr2);
            MyBigNumber bgrByAbs, smlrByAbs;
            int         signOfBigger = 0;

            if (smallerByAbs == 1)
            {
                smlrByAbs    = myNmbr1;
                bgrByAbs     = myNmbr2;
                signOfBigger = myNmbr2.SignNmbr;
            }
            else
            {
                smlrByAbs    = myNmbr2;
                bgrByAbs     = myNmbr1;
                signOfBigger = myNmbr1.SignNmbr;
            }
            string biggerAbsNmbrs  = bgrByAbs.PartDigits;
            string smallerAbsNmbrs = smlrByAbs.PartDigits;
            int    biggerAbsFlPos  = bgrByAbs.FloatPointPosition;
            int    smallerAbsFlPos = smlrByAbs.FloatPointPosition;
            int    biggerFlPPos    = 0;

            if (biggerAbsFlPos > smallerAbsFlPos)
            {
                biggerFlPPos    = biggerAbsFlPos;
                smallerAbsNmbrs = MyBigNumber.AddNmbrZero(smallerAbsNmbrs, -1 * (biggerAbsFlPos - smallerAbsFlPos));
            }
            else
            {
                biggerFlPPos   = smallerAbsFlPos;
                biggerAbsNmbrs = MyBigNumber.AddNmbrZero(biggerAbsNmbrs, -1 * (smallerAbsFlPos - biggerAbsFlPos));
            }
            if (smallerAbsNmbrs.Length < biggerAbsNmbrs.Length)
            {
                smallerAbsNmbrs = MyBigNumber.AddNmbrZero(smallerAbsNmbrs, biggerAbsNmbrs.Length - smallerAbsNmbrs.Length);
            }
            string newStrPartDigits;

            if ((myNmbr1.SignNmbr * myNmbr2.SignNmbr) >= 0)
            {
                newStrPartDigits = MyBigNumber.AddTwoLines(biggerAbsNmbrs, smallerAbsNmbrs);
            }
            else
            {
                newStrPartDigits = MyBigNumber.BiggerMinusSmaller(biggerAbsNmbrs, smallerAbsNmbrs);
            }
            var myNmbr3 = new MyBigNumber()
            {
                PartDigits = newStrPartDigits, SignNmbr = signOfBigger, FloatPointPosition = biggerFlPPos
            };
            string newStringVal = myNmbr3.Value();

            return(MyBigNumber.CreateMyBigNumber(newStringVal));
        }
        public static MyBigNumber MultiplyBy(MyBigNumber myBigNumber, MyBigNumber myBigMultiplier)
        {
            string tmpNmbrString   = myBigNumber.PartDigits;
            string tmpMltplrString = myBigMultiplier.PartDigits;
            var    lstMtpldLines   = new List <string>(tmpMltplrString.Length);

            for (int i = tmpMltplrString.Length - 1; i >= 0; i--)
            {
                string line = MyBigNumber.MultiplyLineByChar(tmpNmbrString, tmpMltplrString[i]);
                line = MyBigNumber.AddNmbrZero(line, (-1 * (tmpMltplrString.Length - 1 - i)));
                lstMtpldLines.Add(line);
            }
            MyBigNumber.IndentLengthWithZeroes(lstMtpldLines);
            string lineSum = lstMtpldLines[0];

            for (int i = 1; i < lstMtpldLines.Count; i++)
            {
                string tmpLine  = lstMtpldLines[i];
                var    lsAppend = new List <string>(2);
                lsAppend.Add(lineSum);
                lsAppend.Add(tmpLine);
                MyBigNumber.IndentLengthWithZeroes(lsAppend);
                lineSum = MyBigNumber.AddTwoLines(lsAppend[0], lsAppend[1]);
            }
            int pstnFloatPoint = myBigNumber.FloatPointPosition + myBigMultiplier.FloatPointPosition;
            int nmbrLeadZeroes = pstnFloatPoint - lineSum.Length + 1;

            if (nmbrLeadZeroes > 0)
            {
                lineSum = MyBigNumber.AddNmbrZero(lineSum, nmbrLeadZeroes);
            }
            int newSign     = myBigMultiplier.SignNmbr * myBigNumber.SignNmbr;
            var newMyNumber = new MyBigNumber()
            {
                PartDigits = lineSum, FloatPointPosition = pstnFloatPoint, SignNmbr = newSign
            };
            string resultValue = newMyNumber.Value();
            var    resMyNumber = MyBigNumber.CreateMyBigNumber(resultValue);

            return(resMyNumber);
        }