fixed code bug in check

data/3.C语言高阶/3.位运算/1.位和字节/check.md

@@ -27,7 +27,7 @@ int check(int x) {
     if(x < 2){
         return 0;
     }
-    return x & (x-1) == 0;
+    return (x & (x-1)) == 0;
 }
 
 ```
@@ -38,11 +38,31 @@ int check(int x) {
 
 ```c
 
-bool check(int x) {
-    if(x < 2){
-        return 0;
-    }
+int check(int x) {
+    return (x & (x-1)) == 0;
+}
+
+```
+
+### 优先级错误
+
+```c
+
+int check(int x) {
     return x & (x-1) == 0;
 }
 
 ```
+
+### 边界条件处理的不对
+
+```c
+int check(int x) {
+    for(int value = x; value > 0; value = value/2) {
+        if((value % 2) != 0){
+            return 0;
+        }
+    }
+    return 1;
+}
+```
\ No newline at end of file