Update 7. Reverse Integer.md

Author: ShusenTang

Diff for: solutions/7. Reverse Integer.md

@@ -7,7 +7,7 @@
 * Python 3.6：>>> (-7) % 3 // 输出 2
 # C++
 ## 方法一
-```
+``` C++
 class Solution {
 public:
     int reverse(int x) {
@@ -25,8 +25,9 @@ public:
     }
 };
 ```
+
 ## 方法二(较方法一更快)
-```
+``` C++
 class Solution {
 public:
     int reverse(int x) {