public INode AddFirstNode()
{
List <IOperator> operators = new List <IOperator>();
Console.WriteLine("\n1.x\n" +
"2.skaičių\n" +
"3.cos(ax+b)\n" +
"4.sin(ax+b)\n" +
"5.e^ax+b\n" +
"6.ln(ax+b)\n" +
"(\n"
);
Console.Write(equation);
string choice = Console.ReadLine();
switch (choice)
{
case "1":
AddOperationToNode(CreateX(), operators);
break;
case "2":
AddOperationToNode(CreateNumber(), operators);
break;
case "3":
AddOperationToNode(CreateCosX(), operators);
break;
case "4":
AddOperationToNode(CreateSinX(), operators);
break;
case "5":
AddOperationToNode(CreateEx(), operators);
break;
case "6":
AddOperationToNode(CreateLnX(), operators);
break;
case "(":
equation += "(";
OpenParenthesis item = new OpenParenthesis(accuracy, riba);
item.equation = equation;
var ri = item.AddFirstNode();
equation = item.equation;
AddOperationToNode(ri, operators);
break;
default:
Console.WriteLine("nera tokio pasirinkimo");
break;
}
DoOperations s = new DoOperations(operators);
return(s.SimplifyNodes());
}
static void Main(string[] args)
{
Console.WriteLine(
@"C# delegates are similar to pointers to functions, in C or C++.
With the help of deletgates, methods can be passed as a parameter to another methods.
A delegate is a reference type variable that holds the reference to a method.
The reference can be changed at runtime.");
Console.WriteLine(Environment.NewLine);
Console.WriteLine(@"Following example shows a delegate DoOperations. It is used
to perform various operations on 2 integers like add, subtract and multiply.");
Console.WriteLine(Environment.NewLine);
DoOperations add = new DoOperations(Add);
Console.WriteLine("Addition 2+3 = " + add(2, 3));
DoOperations subtract = Subtract;
Console.WriteLine("Subtraction 2-3 = " + subtract(2, 3));
result = 1;
DoOperations multiply = Multiply;
Console.WriteLine("Multiplication 2*3 = " + multiply(2, 3));
Console.WriteLine(Environment.NewLine);
Console.WriteLine(@"This is multicast delegate. When delegate is invoked, seris of methods will be invoked.
In this case, first Add method and then Multiply method will be invoked.");
add += multiply;
Console.WriteLine("Result 2+3 = 5; 5*(2*3) = : " + CallBackMethod(add, 2, 3));
Console.ReadKey();
}
static int CallBackMethod(DoOperations doOperations, int a, int b)
{
result = doOperations(a, b);
return(result);
}
