//freebie add courtesy of professor amack
public InfInt Add(InfInt addValue)
{
InfInt temp = new InfInt();
if (Positive == addValue.Positive)
{
temp = AddPositives(addValue);
}
//addvalue is negative
else if (Positive && (!addValue.Positive))
{
addValue.Positive = true;
if (IsGreaterThan(addValue))
{
temp = SubtractPositives(addValue);
}
else
{
temp = addValue.SubtractPositives(this);
temp.Positive = false;
}
addValue.Positive = false;
}
else if (!Positive && addValue.Positive)
{
addValue.Positive = false;
if (IsGreaterThan(addValue))
{
temp = addValue.SubtractPositives(this);
}
else
{
temp = SubtractPositives(addValue);
temp.Positive = false;
}
addValue.Positive = true;
}
return(temp);
}
//Figures out what function needs to be done in order to subtract 2 InfInt's
public InfInt Subtract(InfInt subtractValue)
{
InfInt temp = new InfInt(); // temporary result
// subtractValue is negative
if (Positive && (!subtractValue.Positive))
{
temp = AddPositives(subtractValue);
}
// this InfInt is negative
else if (!Positive && subtractValue.Positive)
{
temp = AddPositives(subtractValue);
}
// at this point, both InfInts have the same sign
else
{
bool isPositive = Positive; // original sign
bool resultPositive = Positive; // sign of the result
// set both to positive so we can compare absolute values
Positive = true;
subtractValue.Positive = true;
if (this.IsGreaterThan(subtractValue))
{
temp = this.SubtractPositives(subtractValue);
}
else
{
temp = subtractValue.SubtractPositives(this);
resultPositive = !isPositive; // flip the sign
}
Positive = isPositive;
subtractValue.Positive = isPositive;
temp.Positive = resultPositive;
}
return(temp);
}
