C# Variables

Declaring Variables

All variables in C# must be declared with a type:

int age;
string name;
bool isOnline;

Initializing Variables

You can assign values during declaration or after:

int age = 25;
string name;
name = "Alice";

Variable Naming Rules

• Must start with a letter or underscore
• Cannot use C# keywords
• Case-sensitive (e.g. total ≠ Total)

Multiple Declarations

Constants

Use const to declare values that never change:

Practice Prompt

What does this print?

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