Naming conventions in C# - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of variable names with different casing

What is the output of this C# code snippet?

C Sharp (C#)

using System;
class Program {
    static void Main() {
        int myVariable = 5;
        int MyVariable = 10;
        Console.WriteLine(myVariable + ", " + MyVariable);
    }
}

A 10, 5

B Runtime error

C Compilation error due to duplicate variable names

D 5, 10

💡 Hint

Remember that C# is case-sensitive when it comes to variable names.

C# treats myVariable and MyVariable as two different variables because it is case-sensitive. So, the output prints their values separated by a comma.

🧠 Conceptual

intermediate

Correct naming convention for constants

Which of the following is the correct naming convention for a constant in C#?

A const int MaxSize = 100;

B int MAX_SIZE = 100;

C const int max_size = 100;

D int maxSize = 100;

💡 Hint

Constants in C# are usually declared with const keyword and use PascalCase.

In C#, constants are declared with the const keyword and follow PascalCase naming convention, so MaxSize is correct.

🔧 Debug

advanced

Identify the naming convention violation

Which option violates the standard C# naming conventions for methods?

A public void CalculateTotal123() {}

B public void calculateTotal() {}

C public void Calculate_Total() {}

D public void CalculateTotal() {}

💡 Hint

Methods in C# should use PascalCase without underscores.

Option B uses camelCase (calculateTotal) which is not the standard for methods in C#. Methods should use PascalCase.

📝 Syntax

advanced

Which variable name causes a syntax error?

Which of the following variable names will cause a syntax error in C#?

A int totalValue;

B int _count;

C int 2ndValue;

D int value_2;

💡 Hint

Variable names cannot start with a digit in C#.

Option C starts with a digit which is not allowed in C# variable names, causing a syntax error.

🚀 Application

expert

Determine the number of items in a dictionary with naming conventions

Given the following C# code, how many items will the dictionary contain after execution?

C Sharp (C#)

using System.Collections.Generic;
var dict = new Dictionary<string, int>();
dict["FirstKey"] = 1;
dict["firstkey"] = 2;
dict["First_Key"] = 3;
dict["FirstKey"] = 4;

A 3

B 4

C 1

D 2

💡 Hint

Dictionary keys in C# are case-sensitive and exact string matches.

The dictionary keys are "FirstKey", "firstkey", and "First_Key" which are all different strings. The last assignment to "FirstKey" updates its value, so total items are 3.