int main
{
	cin time

	while time is not -1
	{
		if IsValidEntry time
			cin distance
			if IsValidEntry distance
				cin c or b
				if Calculate_Time
					timeWithCurrent = Calculate_Time
					timeAGainstCurrent = Calculate_Time
					print
				else
					invalid speed
			else
				invalid distance
		else
			invalid time

		cin time
	}

	return 0;
}


//call this with totalTime, distance, and whichSpeed inputted but boatSpeed and currentSpeed not.

bool Calculate_Speeds (float totalTime, float distance, char whichSpeed, float & boatSpeed, float & currentSpeed)
{
	if whichSpeed is 'C'
		cin boatSpeed
		if IsValidEntry
			calculate currentSpeed
			return true
		else return false

	if whichSpeed is 'B'
		cin currentSpeed
		if IsValidEntry
			calculate boatSpeed
			return true
		else return false

}

float Calculate_Time(string direction, float boatSpeed, float currentSpeed, float distance)
{
	if direction is "WITH"
		return the value given by the WITH_CURRENT formula
	else if direction is "AGAINST"
		return the value given by the AGAINST_CURRENT formula
}


bool IsValidEntry(char entry), float value)
{
	if the entry is "T"
	and the value is (greater than 0) and (less than or equal to MAXTIME)
	return true

	else if the entry is "S"
	and the value is (greater than 0) and (less than or equal to MAXSPEED)
	return true

	else if the entry is "D"
	and the value is (greater than 0) and (less than or equal to MAXDIST)
	return true

	else return false
}