public bool SetObjectiveFunction(string objectiveFunctionString)
{
if (ObjectiveFunction.TryParse(objectiveFunctionString, out ObjectiveFunction objectiveFunction))
{
ObjectiveFunction = objectiveFunction;
}
else
{
return(false);
}
return(true);
}
public static bool TryParse(string objectiveFunctionString, out ObjectiveFunction objectiveFunction)
{
objectiveFunction = new ObjectiveFunction();
if (string.IsNullOrWhiteSpace(objectiveFunctionString))
{
return(false);
}
string coefficientText = "";
bool negitive = false;
char previousChar = ' ';
foreach (char character in objectiveFunctionString)
{
if (character == ' ')
{
continue;
}
else if (character == '+')
{
negitive = false;
}
else if (character == '-')
{
negitive = true;
}
if (character == '.' || char.IsDigit(character))
{
coefficientText += character;
}
else if (char.IsLetter(character) && !char.IsLetter(previousChar))
{
if (string.IsNullOrWhiteSpace(coefficientText))
{
coefficientText = "1";
}
if (double.TryParse(coefficientText, out double coefficient))
{
objectiveFunction.AddVariable(character, coefficient * (negitive ? -1 : 1));
}
coefficientText = "";
}
else if (char.IsLetter(character) && char.IsLetter(previousChar))
{
return(false);
}
previousChar = character;
}
return(true);
}
public MainWindow()
{
InitializeComponent();
ObjectiveFunction instance = new ObjectiveFunction();
instance.ShowDialog();
objFunction = instance.ObjFunction;
objFunction_label.Content = "Your objective function: \n" + objFunction;
addConstraint_btn.Click += AddConstraint_btn_Click;
deleteConstraint_btn.Click += DeleteConstraint_btn_Click;
solve_btn.Click += Solve_btn_Click;
}
public void Output()
{
System.Console.Write("Maximize \t");
ObjectiveFunction.Output();
System.Console.Write("Subject to \t");
if (Constraints.Length > 0)
{
Constraints[0].Output();
for (int i = 1; i < Constraints.Length; i++)
{
System.Console.Write("\t\t"); Constraints[i].Output();
}
}
}
public LPParser()
{
ObjectiveFunction = new ObjectiveFunction();
Constraints = new List <Constraint>();
}
public LinearProgram()
{
ObjectiveFunction = new ObjectiveFunction();
Constraints = new Constraint[0];
}
