Update 重载++的时钟.cpp

修复了++的时候判断时使用if(second=60)的bug，增加了后缀形式的++重载，完善了++的返回值。

practical_exercises/10_day_practice/day4/时钟练习题/重载++的时钟.cpp

@@ -1,5 +1,5 @@
 /*
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD>ܹ<EFBFBD><EFBFBD><EFBFBD>¼ʱ<EFBFBD><EFBFBD><EFBFBD>֡<EFBFBD><EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>++<2B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿִ<C3BF><D6B4>һ<EFBFBD><D2BB>++<2B><><EFBFBD>㣬<EFBFBD><E3A3AC>ʱ1<CAB1>룬<EFBFBD><EBA3AC>Ҫʹ<D2AA><CAB9>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>ܹ<EFBFBD><DCB9>Զ<EFBFBD><D4B6><EFBFBD>λ<EFBFBD><CEBB>
+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<<"<EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>"<<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;