static void DoStruct()
{
AddHeading("Structures");
// Structs are value types; Classes are reference types
// Structs exist only on the stack, whereas class objects reference
// their entities on the heap
Graph pos1 = new Graph(12, 5);
Graph pos2 = new Graph(8, 11);
Console.WriteLine(">> Initial Values:");
Console.WriteLine("Position 1: [{0},{1}]", pos1.xPos, pos1.yPos);
Console.WriteLine("Position 2: [{0},{1}]", pos2.xPos, pos2.yPos);
// This assigns values of "pos1" to same values of "pos2", but as a struct
// is not a reference type it does not point to "pos2", unlike a class type
pos1 = pos2;
Console.WriteLine(">> After: pos1 = pos2");
Console.WriteLine("Position 1: [{0},{1}]", pos1.xPos, pos1.yPos);
Console.WriteLine("Position 2: [{0},{1}]", pos2.xPos, pos2.yPos);
pos1.xPos = 24;
Console.WriteLine(">> After: pos1.xPos = 24");
Console.WriteLine("Position 1: [{0},{1}]", pos1.xPos, pos1.yPos);
Console.WriteLine("Position 2: [{0},{1}]", pos2.xPos, pos2.yPos);
pos1.Transpose();
Console.WriteLine(">> After: pos1.Transpose()");
Console.WriteLine("Position 1: [{0},{1}]", pos1.xPos, pos1.yPos);
Console.WriteLine("Position 2: [{0},{1}]", pos2.xPos, pos2.yPos);
int day = InputInteger("Input date day", 1, 31);
int month = InputInteger("Input date month number", 1, 12);
int year = InputInteger("Input the year", 1950, 2100);
Console.WriteLine(">> Input date: {0:D2}/{1:D2}/{2}", day, month, year);
MyDate xdate = new MyDate(day, month, year);
xdate.ShowDate();
}