Joseph Albahari - C# 5.0 Pocket Reference

Here is a program that multiplies 12 by 30, and prints the result, 360, to the screen. The double forward slash indicates that the remainder of a line is a comment .

using System; // Importing namespaceclass Test // Class declaration{ static void Main() // Method declaration { int x = 12 * 30; // Statement 1 Console.WriteLine (x); // Statement 2 } // End of method} // End of class

At the heart of this program lie two statements . Statements in C# execute sequentially and are terminated by a semicolon. The first statement computes the expression12 * 30 and stores the result in a local variable , named x, which is an integer type. The second statement calls the Console classs WriteLinemethod to print the variable x to a text window on the screen.

A method performs an action in a series of statements called a statement block a pair of braces containing zero or more statements. We defined a single method named Main.

Writing higher-level functions that call upon lower-level functions simplifies a program. We can refactor our program with a reusable method that multiplies an integer by 12, as follows:

using System;class Test{ static void Main() { Console.WriteLine (FeetToInches (30)); // 360 Console.WriteLine (FeetToInches (100)); // 1200 } static int FeetToInches (int feet) { int inches = feet * 12; return inches; }}

A method can receive input data from the caller by specifying parameters and output data back to the caller by specifying a return type . We defined a method called FeetToInches that has a parameter for inputting feet, and a return type for outputting inches, both of type int (integer).

The literals