Day i do not know

191. Number of 1 Bits/191. Number of 1 Bits.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_191._Number_of_1_Bits</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

191. Number of 1 Bits/Program.cs

@@ -0,0 +1,9 @@
+namespace _191._Number_of_1_Bits;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}

191. Number of 1 Bits/Solution.cs

@@ -0,0 +1,15 @@
+namespace _191._Number_of_1_Bits;
+
+public class Solution
+{
+    public int HammingWeight(uint n)
+    {
+        int count = 0;
+        while (n > 0)
+        {
+            count+=(int)(n & 1);
+            n >>= 1;
+        }
+        return count;
+    }
+}