private static void DisplayExample(Polynomial first, Polynomial second, Polynomial added, Polynomial subtracted, Polynomial multiplied)
{
StringBuilder print = new StringBuilder();
string border = new string('-', 60);
print.AppendLine("Problem 11. Adding polynomials \nWrite a method that adds two polynomials. \nRepresent them as arrays of their coefficients.")
.AppendLine("Problem 12. Subtracting polynomials \nExtend the previous program to support also subtraction and multiplication of polynomials.");
// print
print.AppendLine("Example:")
.AppendLine(border)
.AppendLine(string.Format("{0,20} | {1,20}", "first", "second"))
.AppendLine(string.Format("{0,20} | {1,20}", first.ToString(), second.ToString()))
.AppendLine(border)
.AppendLine(string.Format("{0,20} | {1,20} | {2,20}", "added", "subtracted", "multiplied"))
.AppendLine(string.Format("{0,20} | {1,20} | {2,20}", added.ToString(), subtracted.ToString(), multiplied.ToString()))
.AppendLine(border)
.AppendLine(string.Format("{0,20} | {1,20} | {2,20}", string.Join(" ", added.Coefficients), string.Join(" ", subtracted.Coefficients), string.Join(" ", multiplied.Coefficients)))
.AppendLine(border);
Console.WriteLine(print.ToString());
// test with your input
Console.Write("Try it yourself! \nEnter first polynomial coefficients as integer numbers separated by space: ");
first = new Polynomial(ConvertStringOfIntsToArray(Console.ReadLine()));
Console.Write("Enter second polynomial coefficients as integer numbers separated by space: ");
second = new Polynomial(ConvertStringOfIntsToArray(Console.ReadLine()));
added = first + second;
subtracted = first - second;
multiplied = first * second;
// print
print.Clear()
.AppendLine(border)
.AppendLine(string.Format("{0,20} | {1,20}", "first", "second"))
.AppendLine(string.Format("{0,20} | {1,20}", first.ToString(), second.ToString()))
.AppendLine(border)
.AppendLine(string.Format("{0,20} | {1,20} | {2,20}", "added", "subtracted", "multiplied"))
.AppendLine(string.Format("{0,20} | {1,20} | {2,20}", added.ToString(), subtracted.ToString(), multiplied.ToString()))
.AppendLine(border)
.AppendLine(string.Format("{0,20} | {1,20} | {2,20}", string.Join(" ", added.Coefficients), string.Join(" ", subtracted.Coefficients), string.Join(" ", multiplied.Coefficients)))
.AppendLine(border);
Console.WriteLine(print.ToString());
}