static void Main(string[] args)
{
List<Variable> variable = new List<Variable>();
variable.Add(new Variable("x", 10));
Parser parser = new Parser(variable);
Console.WriteLine(parser.calculate("x"));
Console.WriteLine("Write your Equation:");
Console.WriteLine(parser.calculate(Console.ReadLine()));
Console.WriteLine("Exit with any Key");
Console.ReadLine();
}
public double calculate()
{
double ret = 0;
switch (type)
{
case "(":
ret = parameters[0];
break;
case "sin(":
ret = Math.Sin(parameters[0]);
break;
case "sqrt(":
if (parameters.Count == 1)
ret = Math.Sqrt(parameters[0]);
else
ret = Math.Pow(parameters[1], 1 / parameters[0]);
break;
case "log(":
if (parameters.Count == 1)
ret = Math.Log(parameters[0]);
else
ret = Math.Log(parameters[1], parameters[0]);
break;
case "abs(":
ret = Math.Abs(parameters[0]);
break;
case "fac(":
ret = parameters[0];
int tempret = 1;
if (ret == (int)ret)
{
for (int ii = 2; ii <= (int)ret; ii++)
tempret *= ii;
ret = tempret;
}
else
{
ret = (Math.Sqrt(3 * Math.PI * (6 * ret + 1)) * Math.Pow(ret, ret) * Math.Pow(Math.E, -ret)) / 3;
}
break;
case "integral(":
double min = parameters[0];
double max = parameters[1];
int n = (int)parameters[2];
double h = 0;
string trapezregel = "";
Parser parser = new Parser(null);
if (n > 0)
{
ret = 0;
h = (max - min) / n;
//(f(a) + f(b)) / 2
trapezregel = "(" + term.Replace("x", min.ToString(CultureInfo.CreateSpecificCulture("en-GB"))) +"+"+
term.Replace("x", max.ToString(CultureInfo.CreateSpecificCulture("en-GB"))) + ")/2";
ret += parser.calculate(trapezregel) ;
for (int ii = 1; ii < n; ii++)
{
//<-- + f(a+ i*h)
trapezregel = term.Replace("x", "(" + min.ToString(CultureInfo.CreateSpecificCulture("en-GB")) + "+" + ii.ToString() +
"*" + h.ToString(CultureInfo.CreateSpecificCulture("en-GB")) + ")");
ret += parser.calculate(trapezregel);
}
ret *= h;
}
else
ret = 0;
break;
}
return Math.Round(ret,4);
}