public static LongNumber Add(LongNumber a, LongNumber b)
{
if (a.positive == b.positive)
{
String operand1 = a.value,
operand2 = b.value,
result = "";
int numberLength = LongNumber.AlignLength(ref operand1, ref operand2);
int positionValue,
correction = 0;
for (int i = numberLength - 1; i >= 0; i--)
{
positionValue = Byte.Parse(operand1.Substring(i, 1)) + Byte.Parse(operand2.Substring(i, 1)) + correction;
correction = (positionValue > 9) ? 1 : 0;
result = (correction == 1 ? positionValue - 10 : positionValue) + result;
}
if (correction > 0)
result = correction + result;
if (!a.positive)
result = "-" + result;
return new LongNumber(result);
}
else
{
if (a.positive)
return LongNumber.Subtract(a, new LongNumber(b.value));
else
return LongNumber.Subtract(b, new LongNumber(a.value));
}
}
public static LongNumber Subtract(LongNumber a, LongNumber b)
{
LongNumber result = LongNumber.Subtract(a, b);
Console.WriteLine(" {0} - {1} = {2}", a, b, result);
return result;
}
public static LongNumber Multiply(LongNumber a, LongNumber b)
{
LongNumber result = LongNumber.Multiply(a, b);
Console.WriteLine(" {0} * {1} = {2}", a, b, result);
return result;
}
public static LongNumber Divide(LongNumber a, LongNumber b)
{
LongNumber result = LongNumber.Divide(a, b);
Console.WriteLine(" {0} / {1} = {2}", a, b, result);
return result;
}
public static LongNumber Add(LongNumber a, LongNumber b)
{
LongNumber result = LongNumber.Add(a, b);
Console.WriteLine(" {0} + {1} = {2}", a, b, result);
return result;
}
public void StartCalculation()
{
this.Register1 = GetOperand("Enter the first argument: ");
this.Register2 = GetOperand("Enter the second argument: ");
GetOperations();
Console.ForegroundColor = ConsoleColor.Yellow;
this.Calculate();
}
public static Boolean TryParse(String value, out LongNumber parsedValue)
{
parsedValue = new LongNumber(value);
return Regex.IsMatch(value, @"^[+-]?[0-9]+$");
}
public static LongNumber Subtract(LongNumber a, LongNumber b)
{
if (!a.positive && b.positive)
return LongNumber.Add(a, new LongNumber("-" + b.value));
if (a.positive && !b.positive)
return LongNumber.Add(a, new LongNumber(b.value));
String operand1 = a.value,
operand2 = b.value,
result = "";
int numberLength = LongNumber.AlignLength(ref operand1, ref operand2);
int compareOperands = LongNumber.CompareAbs(operand1, operand2);
if (compareOperands == 0) // abs(a) == abs(b)
return new LongNumber(LongNumber.Zero.Value);
if (compareOperands == -1) // abs(a) < abs(b)
{
String temp = operand1;
operand1 = operand2;
operand2 = temp;
}
int positionValue,
correction = 0;
for (int i = numberLength - 1; i >= 0; i--)
{
positionValue = Byte.Parse(operand1.Substring(i, 1)) - Byte.Parse(operand2.Substring(i, 1)) - correction;
if (positionValue < 0)
{
positionValue += 10;
correction = 1;
}
else
{
correction = 0;
}
result = positionValue + result;
}
if (compareOperands == 1) // abs(a) > abs(b)
{
if (!a.positive)
result = "-" + result;
}
else // abs(a) < abs(b)
{
if (a.positive)
result = "-" + result;
}
return new LongNumber(result);
}
public static LongNumber Multiply(LongNumber a, LongNumber b)
{
if (a.value == LongNumber.Zero.Value || b.value == LongNumber.Zero.Value)
return new LongNumber();
String operand1,
operand2,
tmpResult;
int multiplier,
positionValue,
correction,
digit;
LongNumber result = new LongNumber();
if (a.value.Length < b.value.Length)
{
operand1 = b.value;
operand2 = a.value;
}
else
{
operand1 = a.value;
operand2 = b.value;
}
for (int i = operand2.Length - 1, k = 0; i >= 0; i--, k++)
{
multiplier = Byte.Parse(operand2.Substring(i, 1));
if (multiplier !=0)
{
correction = 0;
tmpResult = "";
for (int j = operand1.Length - 1; j >= 0; j--)
{
positionValue = multiplier * Byte.Parse(operand1.Substring(j, 1)) + correction;
digit = positionValue % 10;
correction = (positionValue - digit) / 10;
tmpResult = digit + tmpResult;
}
if (correction > 0)
tmpResult = correction + tmpResult;
if (k > 0)
tmpResult += new String('0', k);
result = LongNumber.Add(result, new LongNumber(tmpResult));
}
else
{
continue;
}
}
if (a.positive != b.positive)
result.positive = false;
return result;
}
public static LongNumber Divide(LongNumber a, LongNumber b)
{
if (a.value == LongNumber.Zero.Value) // divident = 0
return new LongNumber(LongNumber.Zero.Value);
if (b.value == LongNumber.Zero.Value) // divisor = 0 Exception!
throw new DivideByZeroException();
if (b.value == "1") // divisor = 1
{
if (a.positive == b.positive)
return new LongNumber(a.value);
else
return new LongNumber("-" + a.value);
}
int compareOperands = LongNumber.CompareAbs(a.value, b.value);
if (compareOperands == 0) // divident = divisor
if (a.positive == b.positive)
return new LongNumber("1");
else
return new LongNumber("-1");
if (compareOperands < 0) // divident < divisor
return new LongNumber();
LongNumber dividend = new LongNumber(a.value);
LongNumber divisor = new LongNumber(b.value);
LongNumber result = new LongNumber();
int usedLength = b.value.Length;
LongNumber tempDivident = new LongNumber(a.value.Substring(0, usedLength));
int quotient = 0;
while (true)
{
if (LongNumber.Compare(tempDivident, divisor) >= 0)
{
quotient = 0;
while (LongNumber.Compare(tempDivident, divisor) >= 0)
{
quotient++;
tempDivident = LongNumber.Subtract(tempDivident, divisor);
}
result.Value = result.value + quotient;
}
else
{
result.Value = result.value + "0";
}
usedLength++;
if (usedLength <= a.value.Length)
tempDivident.Value = tempDivident.value + a.value.Substring(usedLength - 1, 1);
else
break;
}
if (a.positive != b.positive)
result.positive = false;
return result;
}
/**
* Returns:
* 1 : a > b
* -1 : a < b
* 0 : a = b
*/
public static int Compare(LongNumber a, LongNumber b)
{
if (a.positive != b.positive)
return (a.positive ? 1 : -1);
String operand1 = a.value,
operand2 = b.value;
int result = LongNumber.CompareAbs(operand1, operand2);
if (!a.positive)
result = -result;
return result;
}