Day i do not know

190. Reverse Bits/190. Reverse Bits.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_190._Reverse_Bits</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

190. Reverse Bits/Program.cs

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+namespace _190._Reverse_Bits;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine(new Solution().reverseBits(2));
+    }
+}

190. Reverse Bits/Solution.cs

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+namespace _190._Reverse_Bits;
+
+public class Solution
+{
+    public uint reverseBits(uint n)
+    {
+        uint res = 0;
+        int count = 32;
+        while(count-- > 0)
+        {
+            res <<= 1;
+            res += n & 1;
+            n >>= 1;
+        }
+        return res;
+    }
+}