private List <Tuple <decimal, TupleOperation> > GenerateRandomEquation()
{
List <Tuple <decimal, TupleOperation> > result = new List <Tuple <decimal, TupleOperation> >();
int counter = 1;
decimal term = 0;
int termCount = TermPool.Count;
int opCount = OperatorPool.Length;
TupleOperation operation = new TupleOperation();
OperationType lastOperand = OperationType.None;
while (counter <= NumberOfOperations)
{
do
{
term = Convert.ToDecimal(TermPool[EquationArgs.Rand.Next(0, termCount)]);
}while (lastOperand == OperationType.Divide && term == 0);
if (counter == NumberOfOperations)
{
operation = new TupleOperation(OperationType.Equal);
}
else
{
operation = new TupleOperation(OperatorPool.ElementAt(EquationArgs.Rand.Next(0, opCount)).ToString());
}
result.Add(new Tuple <decimal, TupleOperation>(term, operation));
lastOperand = operation.Operand;
counter++;
}
return(result);
}
public void GenerateNewAndEvaluate(IEquationFinderArgs args)
{
_result = null;
_isSolution = false;
EquationArgs = args;
IncreasingOperations = new List <TupleOperation>();
DecreasingOperations = new List <TupleOperation>();
foreach (char op in EquationArgs.OperatorPool)
{
TupleOperation tupleOperation = new TupleOperation(op);
switch (tupleOperation.Operand)
{
case OperationType.Add:
case OperationType.Multiply:
case OperationType.Exponentiation:
IncreasingOperations.Add(tupleOperation);
break;
case OperationType.Subtract:
case OperationType.Divide:
DecreasingOperations.Add(tupleOperation);
break;
}
}
BuildEquation();
}
public override bool Equals(object obj)
{
TupleOperation other = obj as TupleOperation;
if (other == null)
{
return(false);
}
return(this.Operand.Equals(other.Operand));
}
private decimal Solve()
{
if (_result == null)
{
TupleOperation lastOperation = new TupleOperation(OperationType.None);
decimal runningTotal = 0;
foreach (Tuple <decimal, TupleOperation> t in Equation)
{
if (lastOperation.Operand == OperationType.None)
{
runningTotal = (decimal)t.Item1;
}
else
{
runningTotal = lastOperation.Calculate((decimal)runningTotal, (decimal)t.Item1);
}
lastOperation = t.Item2;
}
_result = runningTotal;
}
return((decimal)_result);
}
private void BuildEquation()
{
if (_result != null)
{
return;
}
int termCount = TermPool.Count;
int increasingOpCount = IncreasingOperations.Count;
int decreasingOpCount = DecreasingOperations.Count;
int counter = 1;
BigInteger currentTerm = 0;
BigInteger runningTotal = 0;
TupleOperation currentOperation = new TupleOperation();
TupleOperation lastOperation = new TupleOperation(OperationType.None);
List <Tuple <BigInteger, TupleOperation> > result = new List <Tuple <BigInteger, TupleOperation> >();
while (counter <= NumberOfOperations)
{
do
{
currentTerm = TermPool[EquationArgs.Rand.Next(0, termCount)];
}while (lastOperation.Operand == OperationType.Divide && currentTerm == 0);
if (lastOperation.Operand == OperationType.None)
{
runningTotal = currentTerm;
}
else
{
runningTotal = lastOperation.Calculate((BigInteger)runningTotal, currentTerm);
}
if (counter == NumberOfOperations)
{
currentOperation = new TupleOperation(OperationType.Equal);
}
else
{
switch (runningTotal.CompareTo(TargetValue))
{
case -1:
currentOperation = IncreasingOperations.ElementAt(EquationArgs.Rand.Next(0, increasingOpCount));
break;
case 1:
currentOperation = DecreasingOperations.ElementAt(EquationArgs.Rand.Next(0, decreasingOpCount));
break;
case 0:
currentOperation = new TupleOperation(OperationType.Equal);
result.Add(new Tuple <BigInteger, TupleOperation>(currentTerm, currentOperation));
Equation = result;
_result = runningTotal;
if (EquationArgs.TargetValuePredicate == ResultPredicate.IsDivisibleBy)
{
_isSolution = ((_result != 0) && (_result % TargetValue == 0));
}
else if (EquationArgs.TargetValuePredicate == ResultPredicate.IsEqualTo)
{
_isSolution = (_result == TargetValue);
}
return;
}
//
}
result.Add(new Tuple <BigInteger, TupleOperation>(currentTerm, currentOperation));
lastOperation = currentOperation;
counter++;
}
Equation = result;
_result = runningTotal;
if (EquationArgs.TargetValuePredicate == ResultPredicate.IsDivisibleBy)
{
_isSolution = ((_result != 0) && (_result % TargetValue == 0));
}
else if (EquationArgs.TargetValuePredicate == ResultPredicate.IsEqualTo)
{
_isSolution = (_result == TargetValue);
}
}
public BigInteger Calculate(BigInteger Value1, BigInteger Value2)
{
return(TupleOperation.Calculate(Value1, Value2, this.Operand));
}
public static OperationType Parse(char charOperand)
{
return(TupleOperation.Parse(charOperand.ToString()));
}
public decimal Calculate(decimal Value1, decimal Value2)
{
return(TupleOperation.Calculate(Value1, Value2, Operand));
}