Variables and Constants
A variable is a storage location within a method. In the preceding examples, both x
and y
are variables. You can assign values to your variables, and you can change those values programmatically.
You create a variable by declaring its type and then giving it a name. You can initialize the variable with a value when you declare it, and you can assign a new value to that variable at any time, changing the value held in the variable. Example 3-1 illustrates this.
Example 3-1. Initializing and assigning a value to a variable
using System; using System.Collections.Generic; using System.Text; namespace InitializingVariables { class Program { static void Main(string[] args) { int myInt = 7; System.Console.WriteLine("Initialized, myInt: {0}", myInt); myInt = 5; System.Console.WriteLine("After assignment, myInt: {0}", myInt); } } } Output: Initialized, myInt: 7 After assignment, myInt: 5
Tip
Visual Studio creates a namespace and using
directive for every program. To save space, I've omitted these from most of the code examples after this one.
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