fd

liwentian · liwentian · commit 580ed60debb0 · 2017-08-24T21:16:34.000+08:00
diff --git a/doc/BitSet.md b/doc/BitSet.md
@@ -6,6 +6,31 @@
         x is odd
     }
     ```
- - 测试nth bit是否设置：`x & (1 << n)`
- - 设置nth bit：`x | (1 << n)`
- - 
+ - Test if the n-th bit is set
+    ```
+    if (x & (1 << n)) {
+        n-th bit is set
+    } else {
+        n-th bit is not set
+    }
+    ```
+ - Set the n-th bit
+    ```
+    y = x | (1 << n)
+    ```
+ - Unset the n-th bit
+    ```
+    y = x & ~(1 << n)
+    ```
+ - Toggle the n-th bit
+    ```
+    y = x ^ (1 << n)
+    ```
+ -  Turn off the rightmost 1-bit
+    ```
+    y = x & (x - 1)
+    ```
+ -  Isolate the rightmost 1-bit
+    ```
+    y = x & (-x)
+    ```
