// MakeOld method
// void means returns nothing
// statc enable the method to be called without createing an object
public static void MakeOld(PersonTwo person)
{
person.Age += 10;
}
static void Main(string[] args)
{
/////////////////////////////
var john = new Person();
john.FirstName = "John";
john.LastName = "Smith";
john.Introduce();
Calculator calculator = new Calculator(); // allocate mamory
var result = calculator.Add(1, 2);
// Because the cw method is defined as static, you do not have to create a new Console instance(object) of Console class
// to call the cw method
Console.WriteLine(result);
/////////////////////////////
// create an array. numbers is an identifier
var numbers = new int[3];
numbers[0] = 1;
Console.WriteLine(numbers[0]);
Console.WriteLine(numbers[1]);
Console.WriteLine(numbers[2]);
// boolean array
var flags = new bool[3];
flags[0] = true;
Console.WriteLine(flags[0]);
Console.WriteLine(flags[1]);
Console.WriteLine(flags[2]);
var names = new string[3] {
"jack", "John", "Mary"
};
Console.WriteLine(names[0]);
Console.WriteLine(names[1]);
Console.WriteLine(names[2]);
/////////////////////////////
// String which is a class on the system namespace. primiive types e.g. int are srucures.
var firstName = "Mosh";
var lastName = "Hamedani";
var fullName = firstName + " " + lastName;
// format is a static method of string class
// Statis methods arw accessible without a need to create an object
var myFullName = string.Format("My name is {0} {1}", firstName, lastName);
// .Join is also a static method on the string class
var namesTwo = new string[3] {
"John", "Jack", "Mary"
};
var formattedNames = string.Join(", ", namesTwo); // separator, array
Console.WriteLine(formattedNames);
var text = "Hi John \nLook into the following paths \nc:\\folder1\\folder2\nc:\\folder3\\folder4";
Console.WriteLine(text);
var text2 = @"Hi John
Look into the following paths
c:\folder1\folder2
c:\folder3\folder3";
Console.WriteLine(text2);
/////////////////////////////
var method = ShippingMethod.Express;
Console.WriteLine(((int)method)); //casting
var methodId = 3; // we want to convert this to ShippingMethod using casting
Console.WriteLine((ShippingMethod)methodId);
Console.WriteLine(method.ToString());
// string to enum
var methodName = "Express";
//parsing converts string to a different type
var shippingMethod = (ShippingMethod)Enum.Parse(typeof(ShippingMethod), methodName);
/////////////////////////////
var a = 10;
var b = a;
b++; //icrement operator
//integeres are value types (values are coppied. a and b are independent)
Console.WriteLine(string.Format("a: {0}, b: {1}", a, b));
// array is reference type (the memory address is the same)
var array1 = new int[3] {
1, 2, 3
};
var array2 = array1;
array2[0] = 0;
Console.WriteLine(string.Format("array1: {0}, array2: {1}", array1[0], array2[0])); //Both are zero
/////////////////////////////
// Value type
var number = 1; // this is inside the scope of main method. It does not have meaning outside
Increment(number); // because int is a value type, the number is still 1. number inside the Increment has a different place in memory
Console.WriteLine(number); // 1
// Ref type sharing the seme reference (memory) in the heap
var person = new PersonTwo()
{
Age = 20
};
MakeOld(person);
Console.WriteLine(person.Age);
}