#include
     
       class time {
   private: int hour,minute,second; public: void settime(int h,int m,int s)     {
           hour=(h>=0&&h<24)?h:0;         minute=(m>=0&&m<60)?m:0;         second=(s>=0&&s<60)?s:0;     } void showtime()     {cout<
      
       <<':'<
       
        <<':'<
        
         <
        
       
      
     

 改后

#include
      
        class time {
    private: int hour,minute,second; public: void settime(int h,int m,int s)     {
            hour=(h>=0&&h<24)?h:0;         minute=(m>=0&&m<60)?m:0;         second=(s>=0&&s<60)?s:0;     } void showtime()     {
            cout<
       
        <<':'<
        
         <<':'<
         
          <
         
        
       
      

 改为外联函数:

#include
      
        class time {
    private: int hour,minute,second; public: void settime(int,int,int); void showtime(); }; void time::settime(int h,int m,int s)     {
            hour=(h>=0&&h<24)?h:0;         minute=(m>=0&&m<60)?m:0;         second=(s>=0&&s<60)?s:0;     } void time::showtime()     {
            cout<
       
        <<':'<
        
         <<':'<
         
          <