C# Assessment: Sample Questions | Bryq

Beginner

Intermediate

Advanced

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These are three sample questions from Bryq’s C# assessment, a coding test for hiring C# developers, .NET developers and back-end engineers. The full assessment covers three levels: beginner, intermediate and advanced, from core syntax and object-oriented principles to memory management, performance and concurrency. Questions test both C# concepts and the ability to read code and predict its output, with four options and one correct answer each.

Beginner

Question

What does the following code print?

int a = 7;
int b = 2;
Console.WriteLine(a / b);

Select your answer

3

3.5

4

3.0

WHY IS THIS THE CORRECT ANSWER

When both operands are integers, C# performs integer division and discards the remainder, so 7 / 2 gives 3. To get 3.5, at least one operand must be a floating-point type, for example 7.0 / 2 or (double)a / b.

Intermediate

Question

What does the following code print?

struct Point { public int X; }

var p1 = new Point { X = 1 };
var p2 = p1;
p2.X = 5;
Console.WriteLine(p1.X);

Select your answer

1

5

0

A compile-time error

WHY IS THIS THE CORRECT ANSWER

Structs are value types, so assigning p1 to p2 copies the whole value. Changing p2.X only affects the copy. If Point were a class, both variables would refer to the same object and the output would be 5.

Advanced

Question

What does the following code print?

var list = new List<int> { 1, 2, 3 };
var query = list.Where(x => x > 1);
list.Add(4);
Console.WriteLine(query.Count());

Select your answer

3

2

4

An InvalidOperationException

WHY IS THIS THE CORRECT ANSWER

LINQ operators such as Where use deferred execution: the filter only runs when the query is enumerated, which happens here when Count() is called. By then the list contains 1, 2, 3 and 4, so three values match. Calling ToList() when defining the query would have captured the result straight away, giving 2.