public static Polynome FromStringArray(string[] coefs) //null if not valid
{
List <Coeficient> tempCoefs = new List <Coeficient>();
Coeficient? c = null;
for (int i = 0; i < coefs.Length; i++)
{
c = Coeficient.FromString(coefs[i]);
if (c.HasValue)
{
tempCoefs.Add(c.Value);
}
else
{
return(null);
}
}
return(new Polynome(tempCoefs));
}
static void Main(string[] args)
{
string line;
string[] lineParts;
Polynome p = null;
while ((line = Console.ReadLine()) != null)
{
lineParts = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);
if (lineParts.Length == 0)
{
Console.WriteLine("Syntax Error");
}
else
{
if (Coeficient.IsValid(lineParts[0]))
{
p = Polynome.FromStringArray(lineParts);
if (p == null)
{
Console.WriteLine("Syntax Error");
}
Console.WriteLine(p);
continue;
}
string[] temp;
Polynome p2;
switch (lineParts[0])
{
case "+":
temp = new string[lineParts.Length - 1];
Array.Copy(lineParts, 1, temp, 0, lineParts.Length - 1);
p2 = Polynome.FromStringArray(temp);
if (p2 == null || p == null)
{
Console.WriteLine("Syntax Error");
continue;
}
p = p.AddPolynome(p2);
Console.WriteLine(p);
break;
case "-":
temp = new string[lineParts.Length - 1];
Array.Copy(lineParts, 1, temp, 0, lineParts.Length - 1);
p2 = Polynome.FromStringArray(temp);
if (p2 == null || p == null)
{
Console.WriteLine("Syntax Error");
continue;
}
p = p.SubtractPolynome(p2);
Console.WriteLine(p);
break;
case "*":
temp = new string[lineParts.Length - 1];
Array.Copy(lineParts, 1, temp, 0, lineParts.Length - 1);
p2 = Polynome.FromStringArray(temp);
if (p2 == null || p == null)
{
Console.WriteLine("Syntax Error");
continue;
}
p = p.MultiplyByPolynome(p2);
Console.WriteLine(p);
break;
case "e":
int val;
if (p == null || lineParts.Length != 2 || !int.TryParse(lineParts[1], out val))
{
Console.WriteLine("Syntax Error");
continue;
}
Console.WriteLine(p.Eval(val));
break;
case "d":
if (p == null)
{
Console.WriteLine("Syntax Error");
continue;
}
p = p.Derive();
Console.WriteLine(p);
break;
case "s":
temp = new string[lineParts.Length - 1];
Array.Copy(lineParts, 1, temp, 0, lineParts.Length - 1);
p2 = Polynome.FromStringArray(temp);
if (p2 == null || p == null)
{
Console.WriteLine("Syntax Error");
continue;
}
p = p.Substitute(p2);
Console.WriteLine(p);
break;
default:
Console.WriteLine("Syntax Error");
break;
}
}
}
}