[Solved] What will be the output of this C# code?var set = new HashSet<int>() {1, 2, 3}; set.Add(2); Console.WriteLine(set.Count); | C Sharp (C#)

C Sharp (C#) - Collections

What will be the output of this C# code?

var set = new HashSet<int>() {1, 2, 3};
set.Add(2);
Console.WriteLine(set.Count);

A3

B4

C2

DRuntime error

Step-by-Step Solution

Solution:

Step 1: Initialize HashSet with 3 unique elements
The set starts with elements 1, 2, and 3, so count is 3.
Step 2: Add duplicate element 2 and check count
Adding 2 again is ignored, so count remains 3.
Final Answer:
3 -> Option A
Quick Check:
HashSet count after duplicate add = 3 [OK]

Quick Trick: Adding duplicates does not increase HashSet count [OK]

Common Mistakes:

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