diff --git a/day4/d2.cpp b/day4/d2.cpp
index 058e619..e71d849 100644
--- a/day4/d2.cpp
+++ b/day4/d2.cpp
@@ -5,8 +5,8 @@ using namespace std;
 
 int main()
 {
-    cout << "12 = " << 12 << endl;                      // 结果：12
-    cout << "ob01001 = " << bitset<5>(0b01001) << endl; // 结果：9, bitset<8>用于2进制形式输出
+    cout << "12 = " << 12 << endl;                      // 结果: 12
+    cout << "ob01001 = " << bitset<5>(0b01001) << endl; // 结果: 9, bitset<8>用于2进制形式输出
     cout << "062 = " << 062 << endl;                    // 结果: 50
     cout << "062 = " << oct << 062 << endl;             // 结果: 50, oct 用于8进制形式输出
     cout << "0x4f = " << hex << 0x4f << endl;           // 结果: 79，hex 用于16进制形式输出