public static void Menu()
{
int x = 0;
do
{
Console.Clear();
Console.WriteLine(" Implement Program Flow \n ");
Console.WriteLine(" Iterate across collection and array items; program decisions by using switch \n");
Console.WriteLine(" statements, if/then, and operators; evaluate expressions");
Console.WriteLine(" 0. Iteration Statements \n ");
Console.WriteLine(" 1. Operators (Ternary / Short-circuiting logic) \n ");
Console.WriteLine(" 9. Quit \n\n ");
Console.Write(" Enter Number to execute Routine ");
int selection;
selection = Common.readInt("Enter Number to Execute Routine : ", 0, 9);
switch (selection)
{
case 0:
IterationStatements.Menu();
Console.ReadKey();
break;
case 1:
Operators.Menu();
break;
case 2:
break;
case 9:
x = 9;
break;
default:
Console.WriteLine(" Invalid Number");
break;
}
} while (x < 9);
}
/* Called by ReferenceTypes.cs
*/
public static void Menu()
{
int x = 0;
do
{
/*
*
* For Each versus using 'For' loop
*
* A foreach is readonly
* If you want to make modifications you have to use a for loop instead of a foreach
*
* But that does'n't mean individual elements are readonly, if the element contains
* reference types you can still modify their values, can't demonstrate that with strings
* because strings are immutable(unable to be changed or a value type, even though a string
* is a reference type). But can be done with an an array
* of a reference type that is mutable (able to be changed).
*
* for each loop
* - can't replace elements
* - can modify values of elements - Array/Lists elements are read only. But the element
* properties can be modified e.g. You can change a word from lowercase to uppercase
* - cannot modify the index
* - only need one loop
* - Must iterate through all elements of a list
*
* for loop
* - can replace elements
* - Needed for nested loops
*
*
*
* Arrays versus Lists
*
* Arrays.
* 1. Fixed Length. Are Definined, so you cannot add to array on the fly.
* If you want to add on the fly you have to use a List.
* 2. Single Dimension array can be used with a foreach
* 3. Strongly typed
* Lists.
* 1. Expandable - can add, insert, or remove elements
* 2. Multi-Dimensional. A List cannot have more than one index.
* Have to use a Multi-Dimensional Array if you want more than one index.
* 3. A list can be used with a foreach.
* 4. Strongly typed
*
* ArrayList
* - Represents an ordered collection of an object that can be indexed
* individually. An Alternative to an array. However, unlike an array
* you can add and remove items from a list at a specified position using
* an index and the array resizes itself automatically. Allows dynamic memory
* allocation, adding, searching and sorting items in the list.
* https://www.tutorialspoint.com/csharp/csharp_arraylist.htm
* List<T> is a generic version of ArrayList See GenericExamples.cs
*
* C# is not like c++ where objects are destroyed when they go out of scope.
* Instead, the Garbage Collector looks for objects which are completely unreferenced at
* the current point of execution. Because the second function has a reference to the
* arraylist, the arraylist and all its contents can't be garbage collected
* while the second function is executing.
*
* Multi-Diminesional Arrays.
* 1. Can have more than one index.
* 2. Follow the x,y coordinates for a 2 dimensional array. Great for grid based data
* 3. Must use a 'for' loop for nested loops
* 4. float [ , ] array1 - defines a 2 dimensional array
* 5. float [ , , ] array1 - defines a 3 dimesion array
* 6. Multi-Dimensional Arrays are Simpler when compared to Jagged Arrays.
* 7. The second, third dimension can only be arrays. Can be any collection with Jagged Arrays
*
* Jagged Arrays.
* 1. Concept - You can put an Array into an Array
* 2. float [ ][ ] array1 - defines this as an array of arrays of floats.
* 3. float [ ][ ][ ] array1 - defines this as an array of arrays or arrays
* 4. float[ ][ ] array1 = new array1[4][] - you always have to set the first elment - says we will store 4 sets of arrays
* 5. Inner arrays (which is defined by the second element) do not have to be the same length, which is why they are called jagged.
* 6. The inner array can be any collections (.i.e. can be a List<int>)
*
*
*/
Console.Clear();
Console.WriteLine(" Store data in and retrieve data from Collections ");
Console.WriteLine(" Store and retrieve data by using dictionaries, arrays, lists, sets, ");
Console.WriteLine(" and queues; hoose a collection type; initialize a collection; add ");
Console.WriteLine(" and remove items from a collection; use typed versus non-typed ");
Console.WriteLine(" collections; implement custom collections; implement collection interfaces. \n ");
Console.WriteLine(" 0. Print Obect Array ");
Console.WriteLine(" 1. Print Generic List ");
Console.WriteLine(" 2. Print Generic List Two ");
Console.WriteLine(" 3. Print Generic List Three ");
Console.WriteLine(" 4. Class return List in Descending Order");
Console.WriteLine(" 5. Website ");
Console.WriteLine(" 6. Take Verb");
Console.WriteLine(" 7. Sort Ascendingz-Descending ");
Console.WriteLine(" 8. Dictionary and other Iterations");
Console.WriteLine(" 9. Quit \n ");
Console.Write(" Enter Number to execute Routine ");
int selection;
int[] J = { 1, 2, 3 };
selection = Common.readInt("Enter Number to Execute Routine : ", 0, 9);
switch (selection)
{
case 0:
PrintObjectArray(new { i = J[2] });
break;
case 1: PrintGenericList();
break;
case 2: PrintGenericList2();
break;
case 3: new PrintGenericList3().Print();
break;
case 4: List <CommonCollections.Cat> threecats = CommonCollections.GetSomeCats(3);
Console.WriteLine(" Listed in Descending Order ");
Console.WriteLine(" Example of a Class returning three Cats");
foreach (CommonCollections.Cat c in threecats)
{
Console.WriteLine(SortingExamples.PrintCats(c));
}
Console.ReadKey();
//
// Returning Full List
//
List <CommonCollections.Cat> dbcats = CommonCollections.GetAllCats();
Console.WriteLine(" Example of a Class returning a Full List");
foreach (CommonCollections.Cat c in dbcats)
{
Console.WriteLine(SortingExamples.PrintCats(c));
}
Console.ReadKey();
break;
case 5:
// Arrays_Collections();
Using_Collections();
break;
case 6:
Test_To_take.TopThree();
break;
case 7:
SortingExamples.Sort_Ascending_Descending();
SortingExamples.Sort_A_Class();
break;
case 8: IterationStatements.Menu();
break;
case 9: x = 9;
break;
default: Console.WriteLine(" Invalid Number");
break;
}
} while (x < 9); // end do
} // end Collections Menu()