// using Class vs Struct
static void ClassTaker(TheClass c)
{
c.willIChange = "Changed";
}
// Normally, all the objects are passed by reference as parameter to the method.
// On the other hand most of the primitive data types such as integer, double, Boolean etc. are passed by value.
public static void ParametersTest()
{
Console.WriteLine("Hello World!");
int y = 5; // initialize y to 5
int z; // declares z, but does not initialize it
// display original values of y and z
Console.WriteLine($"Original value of y: {y}");
Console.WriteLine("Original value of z: uninitialized\n");
// pass y and z by reference
SquareRef(ref y); // must use keyword ref
SquareOut(out z); // must use keyword out
// display values of y and z after they're modified by
// methods SquareRef and SquareOut, respectively
Console.WriteLine($"Value of y after SquareRef: {y}");
Console.WriteLine($"Value of z after SquareOut: {z}\n");
// pass y and z by value
Square(y);
// display values of y and z after they're passed to method Square
// to demonstrate that arguments passed by value are not modified
Console.WriteLine($"Value of y after Square: {y}\n");
// pass y and z by value
Square(z);
Console.WriteLine($"Value of z after Square: {z}\n");
Person p1 = new Person {
name = "John", age = 20
};
Console.WriteLine($"before Person: name: {p1.name} age: {p1.age}\n");
ChangeAge(p1);
Console.WriteLine($"after ChangeAge: name: {p1.name} age: {p1.age}\n");
ChangeAgeRef(ref p1);
Console.WriteLine($"after ChangeAgeRef: name: {p1.name} age: {p1.age}\n");
// using Class vs Struct
Console.WriteLine("using Class vs Struct:");
TheClass testClass = new TheClass();
TheStruct testStruct = new TheStruct();
testClass.willIChange = "Not Changed";
testStruct.willIChange = "Not Changed";
ClassTaker(testClass);
StructTaker(testStruct);
Console.WriteLine("Class field = {0}", testClass.willIChange);
Console.WriteLine("Struct field = {0}", testStruct.willIChange);
// using out to return multiple values
int argNumber;
string argMessage, argDefault;
Method(out argNumber, out argMessage, out argDefault);
Console.WriteLine($"argNumber = {argNumber}, argMessage = {argMessage}, argDefault = {argDefault == null}");
Console.ReadLine();
}
