/// <summary>
///
/// </summary>
/// <returns></returns>
/// <exception cref="System.ArgumentOutOfRangeException">Something is wrong with the digits you specified.</exception>
public Problem Generate()
{
Problem problem = new Problem();
problem.Left = generateValue(LeftDigits, RightDigits);
if (!Problem.IsUnary(Operation))
problem.Right = generateValue(RightDigits, LeftDigits);
problem.Operation = Operation;
if (!Problem.IsUnary(Operation))
applyConstraints(ref problem);
switch (Operation)
{
case MathPractice.Operation.Addition:
if (problem.Left.ToString().Length < problem.Right.ToString().Length)
reverseOperands(ref problem);
break;
case MathPractice.Operation.Subtraction:
if (problem.Left < problem.Right)
reverseOperands(ref problem);
break;
case MathPractice.Operation.Multiplication:
if (problem.Left.ToString().Length < problem.Right.ToString().Length)
reverseOperands(ref problem);
break;
}
return problem;
}
/// <summary>
///
/// </summary>
/// <exception cref="System.ArgumentOutOfRangeException">Bad digit specifications.</exception>
public void PrintProblem()
{
currentProblem = Generator.Generate();
string leftText = currentProblem.Left.ToString();
string rightText = currentProblem.Right.ToString();
char opText = getOperationText(currentProblem.Operation);
Console.WriteLine("[#" + (TotalAnswers + 1).ToString() + "]");
if (Generator.Operation == Operation.DayOfWeek) //todo: make this suck less
{
Console.Write("What is the day of the week for New Year's Day in the year " + currentProblem.Left.ToString() + "? ");
}
else if (Problem.IsUnary(currentProblem.Operation))
{
Console.Write(leftText + opText + " = ");
}
else if (Vertical)
{
string answerPadding = getVerticalAnswerPadding(currentProblem);
Console.WriteLine("------------------");
Console.WriteLine(" " + answerPadding + leftText + "\t");
Console.Write(opText + " ");
for (int i = rightText.Length; i < leftText.Length; i++)
Console.Write(" ");
Console.WriteLine(answerPadding + rightText + "\t");
Console.WriteLine("------------------");
Console.Write(" ");
}
else
Console.Write(leftText + " " + opText + " " + rightText + " = ");
}
private void applyConstraints(ref Problem problem)
{
if (Operation == MathPractice.Operation.DayOfWeek)
{
problem.Right = 0;
problem.Left = (uint)(random.Next(2000, 2100));
return;
}
if (this.Constraints.HasFlag(Constraints.LastDigitCycle))
{
applySequenceConstraint(ref problem.Left, ref problem.Right);
return;
}
if (this.Constraints.HasFlag(Constraints.SecondNumberIsEleven))
problem.Right = 11;
if (this.Constraints.HasFlag(Constraints.BothNumbersAreSame))
problem.Left = problem.Right;
if (this.Constraints.HasFlag(Constraints.LastDigitsAddTo10))
{
uint rightDigit = problem.Right % 10;
uint leftDigit = 10 - rightDigit;
if (leftDigit == 10)
{
problem.Right++;
leftDigit = 9;
}
problem.Left = (problem.Left / 10) * 10 + leftDigit;
}
if (this.Constraints.HasFlag(Constraints.FirstDigitIsSame))
{
StringBuilder leftText = new StringBuilder(problem.Left.ToString());
string rightText = problem.Right.ToString();
leftText[0] = rightText[0];
problem.Left = uint.Parse(leftText.ToString());
}
}
private static void reverseOperands(ref Problem problem)
{
uint temp = problem.Left;
problem.Left = problem.Right;
problem.Right = temp;
}
private static string getVerticalAnswerPadding(Problem problem)
{
StringBuilder output = new StringBuilder();
uint padding = 0;
switch (problem.Operation)
{
case Operation.Addition:
padding = 1;
break;
case Operation.Subtraction:
break;
case Operation.Multiplication:
padding = (uint)problem.Right.ToString().Length;
break;
case Operation.DayOfWeek:
break;
}
for (uint i = 0; i < padding; i++)
output.Append(' ');
return output.ToString();
}
