Type inference

Learn how the compiler infers expression types and type compatibility.

camelCase and PascalCase

In C# naming decides how readable your code is. There are two common styles: camelCase and PascalCase.

In camelCase the first word starts lowercase, the rest are capitalized: firstName, totalPrice, isActive.

In PascalCase every word starts uppercase: FirstName, TotalPrice, CustomerOrder.

Local variables use camelCase; classes and methods use PascalCase. This is the common C# convention.

Keyword conflicts

C# has reserved words: class, int, string, return, if and many more. You cannot use them as variable names.

For example, int class = 5; is a compile error; class is a keyword.

Pick a meaningful suffix instead: write int classNumber = 5; or int classCount = 5;.

Keep names short but meaningful. Avoid vague names like x1, x2; prefer clear ones such as studentCount, orderTotal.

Exercise Declare three camelCase variables and print them

Assign 30 to int studentCount, "C#" to string courseName, and true to bool isOnline. Print the three variables on separate lines with Console.WriteLine.

Show example solution

First write int studentCount = 30; string courseName = "C#"; bool isOnline = true; then add three Console.WriteLine calls.
Example solution:
int studentCount = 30;
string courseName = "C#";
bool isOnline = true;
Console.WriteLine(studentCount);
Console.WriteLine(courseName);
Console.WriteLine(isOnline);

Test yourself

Which one is in camelCase?
- FirstName
- firstname
- First_Name
- firstName
Show answer

firstName — Correct! firstName is camelCase; first word lowercase, the rest uppercase.
Match each name to its style

firstName

camelCase example
FirstName

PascalCase example
first name

no spaces allowed
1user

no leading digit

Write the PascalCase form

string ____ = "Hello";  // class name style

Show answer

string UserName = "Hello";  // class name style

Next lesson: Variable scope

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