A method is a code block that contains a series of statements. Methods. Console.WriteLine(); Console.ReadKey(); Console.ReadKey(); int.

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1 A method is a code block that contains a series of statements Methods Built-in User Define Built-in Methods (Examples): Console.WriteLine(); int.parse(); Methods Void (Procedure) Return (Function)

2 Procedures : Void MethodName (Parameters) Instructions Functions : Type MethodName (Parameters) Instructions return value; Procedures No Data Type (Void) Does not return value Functions Data Type (int,string ) Return value

3 Example namespace ConsoleApplication1 static void msg() Console.WriteLine("Hello"); static void msg(string name) Console.Write("Hello "+name); //Call (Invoke) msg(); msg("ahmid");

4 Example static void add (int x, int y) Console.WriteLine("the result of number1 + number 2 is " + (x + y)); Console.WriteLine("Please enter the first number :"); int x = int.parse(console.readline()); Console.WriteLine("Please enter the second number :"); int y = int.parse(console.readline()); add(x, y);

5 Example static void PrintMax(float number1, float number2) float max = number1; if (number2 > number1) max = number2; Console.WriteLine("Maximum number is : "+ max); Console.WriteLine("Please enter the first number :"); int x = int.parse(console.readline()); Console.WriteLine("Please enter the second number :"); int y = int.parse(console.readline()); PrintMax(x, y);

6 Example class MonthsExample static void SayMonth(int month) string[] monthnames = "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"; Console.Write(monthNames[month-1]); Console.WriteLine("Please enter the month number :"); int x = int.parse(console.readline()); SayMonth(x);

7 Example static void msg() Console.WriteLine("Hello"); static void msg(string name) Console.Write("Hello "+name); static void msg(string name, string address) Console.Write("your name is : " + name +" your address is: "+address); static void stop() :"); //Call (Invoke) Console.WriteLine("please enter your name :"); string x = Console.ReadLine(); Console.WriteLine("please enter your address string y = Console.ReadLine(); msg(x, y); stop();

8 Example static int sum(int N1, int N2) int x = N1 + N2; return x; int N1, N2; Console.WriteLine("Enter the frist number :"); N1 = int.parse(console.readline()); Console.WriteLine("enter the second number :"); N2 = int.parse(console.readline()); Console.WriteLine("the result of 1st number + 2nd number is :" + sum(n1, N2));

9 گۆڕينى پلەى گەرمى Celsius) Example (Convert Fahrenheit to static double FahrenheitToCelsius(double degrees) double celsius = (degrees - 32) / 1.8; return celsius; static void stop() Console.Write("Temperature in Fahrenheit: "); double t = Double.Parse(Console.ReadLine()); t = FahrenheitToCelsius(t); Console.Write("Temperature in Celsius: "+ t); stop();

10 Example (Calculator) First Way: static void sum () Console.WriteLine("enter first number :"); int i = int.parse(console.readline()); Console.WriteLine("enter second number :"); int j = int.parse(console.readline()); Console.WriteLine(i + j); static void sub() Console.WriteLine("enter first number :"); int i = int.parse(console.readline()); Console.WriteLine("enter second number :"); int j = int.parse(console.readline()); Console.WriteLine(i - j); static void mul() Console.WriteLine("enter first number :"); int i = int.parse(console.readline()); Console.WriteLine("enter second number :"); int j = int.parse(console.readline()); Console.WriteLine(i * j);

11 static void div() Console.WriteLine("enter first number :"); int i = int.parse(console.readline()); Console.WriteLine("enter second number :"); int j = int.parse(console.readline()); Console.WriteLine(i / j); Console.WriteLine ("for Sum select 1"); Console.WriteLine("for Sub select 2"); Console.WriteLine("for Mul select 3"); Console.WriteLine("for Div select 4"); int x = int.parse(console.readline()); if (x==1) sum(); else if (x==2) sub(); else if (x==3) mul(); else div();

12 Second Way: static void sum (int i, int j) Console.WriteLine("The result is : "+(i + j)); static void sub(int i, int j) Console.WriteLine("The result is : " + (i - j)); static void mul(int i, int j) Console.WriteLine("The result is : " + (i * j)); static void div(int i, int j) Console.WriteLine("The result is : " + (i / j)); Console.WriteLine ("for Sum select 1"); Console.WriteLine("for Sub select 2"); Console.WriteLine("for Mul select 3"); Console.WriteLine("for Div select 4"); int x = int.parse(console.readline()); Console.WriteLine("Enter the first number:"); int i = int.parse(console.readline()); Console.WriteLine("Enter the second number:");

13 int j = int.parse(console.readline()); if (x==1) sum(i,j); else if (x==2) sub(i,j); else if (x==3) mul(i,j); else div(i,j);