public static Reco createObj()
{
if (flag == false)
{
Reco r = new Reco();
flag = true;
return(r);
}
else
{
return(null);
}
}
// Main method.
static void Main()
{
Console.WriteLine(Colors.Red); // return enum key
Console.WriteLine((char)Colors.Red); // return enum value
Console.Title = "Console App Core"; // Title of the console screen.
// calling class with non static method.
Human mohamed = new Human(); // ahmed object from human , calling with object.
mohamed.add(10, 20); // return 30.
// calling class with static method.
Human.sum(10, 20); // return 30.
// above code it printing in memory.
// hear printing from memory to user interfsce.
System.Console.WriteLine(Human.sum(10, 20)); // without system libarary.
// Example for swaping varibles.
int a = 10;
int b = 20;
// swap a = 20 , b = 10 without using any temp varaible.
b = a; // b = 10.
a = b + b; // a = 10 + 10 = 20.
int x = 99;
int y = 101;
//swap x = 101 , y = 99 without using any temp varaible.
x = x + y; // x = 99 + 101 = 200.
y = x - y; // y = 200 - 101 = 99.
x = x - y; // x = 200 - 99 = 101.
Childs childs = new Childs(); // object from childs >> has a relationship.
Console.WriteLine(childs.age);
Store Cairo = new Store();
Console.WriteLine(Cairo.NumberOfReminingProduct(20)); // 20 requested quntity >> 80 all quntity
Store Ismailia = new Store();
Console.WriteLine(Ismailia.NumberOfReminingProduct(30)); // 30 requested quntity >> 50 all quntity
Store Alex = new Store();
Console.WriteLine(Alex.NumberOfReminingProduct(50)); // 50 requested quntity >> 0 all quntity
// Demo d = new Demo(); // proccess 1 >> time 1 : time of object creation.
//d.PrintMe(); // proccess 2 >> time 2 : time of calling to method.
// when class have constructor
Demo dc = new Demo(); // only 1 proccess and 1 time.
// object with constructor overloding
Demo dco = new Demo(); // only 1 proccess and 1 time.
MyClass m1 = new MyClass();
// Console.WriteLine(m1.name);
MyClass m2 = m1;
m2.name = "reco2";
Console.WriteLine(m1.name);
Console.WriteLine(m2.name);
Reco r = Reco.createObj();
r.speak();
utilits u = new utilits("reco"); // object from class with overload constructor.
string username = "******";
string password = "******";
// fore loop
for (int i = 0; i < 100; i++) // strucur of for loop with condition and incriment.
{
if (i % 2 == 0)
{
if (i <= 9)
{
Console.WriteLine("even number : " + i);
}
else
{
Console.WriteLine("even number : " + i);
}
}
else
{
Console.WriteLine("odd number : " + i);
}
}
// while
int index = 0;
while (index < 10)
{
Console.WriteLine(index);
index++;
}
// do while
int val = 0;
do
{
Console.WriteLine(val);
val++;
}while (val < 8);
//foreach
// inline if , // ternary operator {dision making}.
string answer = "good";
string result = (answer == "good") ? "good job" : "bad job";
Console.WriteLine(result);
//if else
if (username == "ahmed" && password == "123456")
{
Console.WriteLine("login success ... ");
}
else
{
Console.WriteLine("login faild ...");
}
//if elseif else
if (username == "ahmed" && password == "123456")
{
Console.WriteLine("login success ... ");
}
else if (username == "ahmed" || password == "123456")
{
Console.WriteLine("login simi success .... ");
}
else
{
Console.WriteLine("login faild ... ");
}
//swich case comapre between value and value only >> like if else but cant using multi operators.
int myAge = 20;
switch (myAge)
{
case 20:
Console.WriteLine("same age");
break; // end proccess
case 30:
Console.WriteLine("not match");
break; // end proccess
default:
Console.WriteLine("plz chose"); //like else
break;
}
int xa = 5;
double ya = 7.3;
// working with casting ...
xa = (int)ya; // explicit casting
ya = xa; // implicit casting
// another implicit casting
var s = "hi"; // string
var d = 5; // int
Console.WriteLine(s + d);
// working with Anonymous types
Demo rr = new Demo();
var rrr = new Demo();
var anonymousType = new { name = "reco ", age = 25, salary = 1000 };
Console.WriteLine(anonymousType.name);
// daynamic type it's can evaluate the compile time at same run time
dynamic uu = 20; // runtime
var uuu = 50; // compile time
Console.WriteLine(uuu);
const double PI = 3.14; // cannot be re-intialize
// PI = 15.5; // > error
Console.WriteLine(PI);
Ireport ireport = new PDFReport();
ireport.Header();
ireport.Body();
ireport.Footer();
// example of arrays
// 1- single dimention array
int[] ages = { 10, 20, 80, 40, 50, 15 };
// or int[] ages = new int[2];
// ages[0] = 1;
// ages[1] = 2;
// or int[] ages = new int[6] { 10, 20, 30, 40, 50, 60 };
// sorting array
Array.Sort(ages);
// reverse array
Array.Reverse(ages);
for (int i = 0; i < ages.Length; i++)
{
Console.WriteLine("i[" + i + "]" + "=" + ages[i]);
}
// 2- two dimention array
string[,] rectangle = new string[2, 3]; // row * coulmns
rectangle[0, 0] = "mohamed";
rectangle[0, 1] = "abd";
rectangle[0, 2] = "algafour";
rectangle[1, 0] = "ahmed";
rectangle[1, 1] = rectangle[0, 0];
rectangle[1, 2] = "ali";
for (int row = 0; row <= rectangle.GetUpperBound(0); row++)
{
for (int coulmn = 0; coulmn <= rectangle.GetUpperBound(1); coulmn++)
{
Console.WriteLine(rectangle[row, coulmn]);
}
}
// 3- array of array
int[][] jagged = new int[3][];
jagged[0] = new int[3] {
1, 2, 3
};
jagged[1] = new int[2] {
50, 60
};
jagged[2] = new int[5] {
1, 2, 3, 4, 5
};
for (int outer = 0; outer < jagged.Length; outer++)
{
for (int inner = 0; inner < jagged[outer].Length; inner++)
{
Console.Write(jagged[outer][inner] + ",");
}
Console.WriteLine();
}
// example of collections and workink ...
// arraylist
int[] age = { 100, 200, 300 };
ArrayList seq = new ArrayList();
seq.Add(1);
seq.Add('c');
seq.InsertRange(1, age);
seq.Insert(0, "hi");
seq.Remove(100);
seq.RemoveAt(0);
foreach (var item in seq)
{
Console.WriteLine(item);
}
//sortedlist
SortedList seq2 = new SortedList();
seq2.Add("team A", 50);
seq2.Add("team B", 50);
seq2.Add("team C", 50);
foreach (DictionaryEntry item in seq2)
{
Console.WriteLine(item.Key);
Console.WriteLine(item.Value);
}
// stack
Stack st = new Stack();
st.Push("1");
st.Push("10");
st.Push("11");
st.Push("12");
st.Pop("1");
st.Pop("10");
st.Pop("11");
st.Pop("12");
// Queue
Queue q = new Queue();
q.Enqueue(1);
q.Enqueue(15);
q.Enqueue(23);
q.Enqueue(2);
}
// Main method.
static void Main()
{
Console.Title = "Console App Core"; // Title of the console screen.
// calling class with non static method.
Human mohamed = new Human(); // ahmed object from human , calling with object.
mohamed.add(10, 20); // return 30.
// calling class with static method.
Human.sum(10, 20); // return 30.
// above code it printing in memory.
// hear printing from memory to user interfsce.
System.Console.WriteLine(Human.sum(10, 20)); // without system libarary.
// Example for swaping varibles.
int a = 10;
int b = 20;
// swap a = 20 , b = 10 without using any temp varaible.
b = a; // b = 10.
a = b + b; // a = 10 + 10 = 20.
int x = 99;
int y = 101;
//swap x = 101 , y = 99 without using any temp varaible.
x = x + y; // x = 99 + 101 = 200.
y = x - y; // y = 200 - 101 = 99.
x = x - y; // x = 200 - 99 = 101.
Childs childs = new Childs(); // object from childs >> has a relationship.
Console.WriteLine(childs.age);
Store Cairo = new Store();
Console.WriteLine(Cairo.NumberOfReminingProduct(20)); // 20 requested quntity >> 80 all quntity
Store Ismailia = new Store();
Console.WriteLine(Ismailia.NumberOfReminingProduct(30)); // 30 requested quntity >> 50 all quntity
Store Alex = new Store();
Console.WriteLine(Alex.NumberOfReminingProduct(50)); // 50 requested quntity >> 0 all quntity
// Demo d = new Demo(); // proccess 1 >> time 1 : time of object creation.
//d.PrintMe(); // proccess 2 >> time 2 : time of calling to method.
// when class have constructor
Demo dc = new Demo(); // only 1 proccess and 1 time.
// object with constructor overloding
Demo dco = new Demo(); // only 1 proccess and 1 time.
MyClass m1 = new MyClass();
// Console.WriteLine(m1.name);
MyClass m2 = m1;
m2.name = "reco2";
Console.WriteLine(m1.name);
Console.WriteLine(m2.name);
Reco r = Reco.createObj();
r.speak();
utilits u = new utilits("reco"); // object from class with overload constructor.
string username = "******";
string password = "******";
// fore loop
for (int i = 0; i < 100; i++) // strucur of for loop with condition and incriment.
{
if (i % 2 == 0)
{
if (i <= 9)
{
Console.WriteLine("even number : " + i);
}
else
{
Console.WriteLine("even number : " + i);
}
}
else
{
Console.WriteLine("odd number : " + i);
}
}
// while
int index = 0;
while (index < 10)
{
Console.WriteLine(index);
index++;
}
// do while
int val = 0;
do
{
Console.WriteLine(val);
val++;
}while (val < 8);
//foreach
// inline if , // ternary operator {dision making}.
string answer = "good";
string result = (answer == "good") ? "good job" : "bad job";
Console.WriteLine(result);
//if else
if (username == "ahmed" && password == "123456")
{
Console.WriteLine("login success ... ");
}
else
{
Console.WriteLine("login faild ...");
}
//if elseif else
if (username == "ahmed" && password == "123456")
{
Console.WriteLine("login success ... ");
}
else if (username == "ahmed" || password == "123456")
{
Console.WriteLine("login simi success .... ");
}
else
{
Console.WriteLine("login faild ... ");
}
//swich case comapre between value and value only >> like if else but cant using multi operators.
int myAge = 20;
switch (myAge)
{
case 20:
Console.WriteLine("same age");
break; // end proccess
case 30:
Console.WriteLine("not match");
break; // end proccess
default:
Console.WriteLine("plz chose"); //like else
break;
}
}
