diff --git a/day6/d6.cpp b/day6/d6.cpp
new file mode 100644
index 0000000..0dbcce9
--- /dev/null
+++ b/day6/d6.cpp
@@ -0,0 +1,26 @@
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    // 定义 Linux 的文件权限
+    int r = 4, w = 2, x = 1;
+    int n = 0;
+
+    // 为 n 值添加 r 和 w 权限
+    n = r | w;                   // 6: | 位或运算符
+    cout << "n = " << n << endl; // 6
+
+    // 为 n 值添加 x 权限
+    n |= x;                      // 7
+    cout << "n = " << n << endl; // 7
+
+    // 验证 n 是否包含 w 权限
+    if (n & w == w) // 7 & 2 == 2: & 位与运算符
+    {
+        cout << "n 包含 w 权限" << endl;
+    }
+
+    return 0;
+}
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