diff --git a/practical_exercises/10_day_practice/day4/时钟练习题/重载++的时钟.cpp b/practical_exercises/10_day_practice/day4/时钟练习题/重载++的时钟.cpp
index e85fd20..2a2767f 100644
--- a/practical_exercises/10_day_practice/day4/时钟练习题/重载++的时钟.cpp
+++ b/practical_exercises/10_day_practice/day4/时钟练习题/重载++的时钟.cpp
@@ -1,5 +1,5 @@
 /*
-���һ��ʱ���࣬�ܹ���¼ʱ���֡��룬��������++�������ÿִ��һ��++���㣬��ʱ1�룬��Ҫʹ��ʱ�����ܹ��Զ���λ��
+设计一个时钟类，能够记录时、分、秒，重载它的++运算符，每执行一次++运算，加时1秒，但要使计时过程能够自动进位。
 */
 #include<iostream>
 using namespace std;
@@ -10,19 +10,24 @@ class Time{
             minute = m;
             second = s;
         }
-        void operator++();
+        Time operator++();
+        Time operator++(int); 
         void showTime(){
-            cout<<"��ǰʱ��Ϊ��"<<hour<<":"<<minute<<":"<<second<<endl;
+            cout<<"当前时间为："<<hour<<":"<<minute<<":"<<second<<endl;
         }
 
     private:
         int hour,minute,second;
 
 };
-
-void Time::operator++(){
+Time Time::operator++(int n){
+    Time tmp=*this;
+    ++(*this);
+    return tmp;
+}
+Time Time::operator++(){
     ++second;
-    if(second=60){
+    if(second==60){
         second=0;
         ++minute;
         if(minute==60){
@@ -33,12 +38,15 @@ void Time::operator++(){
             }
         }
     }
+    return *this;
 }
 
 int main(int argc, char const *argv[])
 {
     Time t(23,59,59);
     ++t;
+    t.showTime();
+	(t++).showTime();
     t.showTime();
     system("pause");
     return 0;