Load operator ++ and - in C ++

The incremental operators (++) and the reduced operator (-) are the two important unary operators available in C ++.

The following example illustrates how to overload the increment operator (++) with the use of the prefix as well as the suffix. Similarly, you can also overload the reduce operator (-) in C ++:

 #include using namespace  std ; class ThoiGian { private : int  gio ; // tu 0 toi 23 int  phut ; // tu 0 toi 59 public : // phan khai bao cac constructor can thiet ThoiGian (){  gio  = 0 ;  phut  = 0 ; } ThoiGian ( int  h , int  m ){  gio  =  h ;  phut  =  m ; } // phuong thuc de hien thi thoi gian void  hienthiTG () {  cout  << "Gio: " <<  gio  << " Phut: " <<  phut  <<  endl ;  cout  << "-----------------------" <<  endl ; } // nap chong toan tu ++ (tien to) ThoiGian operator ++ () { ++ phut ; // tang doi tuong nay if ( phut  >= 60 ) { ++ gio ;  phut  -= 60 ; } return ThoiGian ( gio ,  phut ); } // nap chong toan tu ++ (hau to) ThoiGian operator ++( int ) { // luu giu gia tri ban dau ThoiGian  T ( gio ,  phut ); // tang doi tuong nay ++ phut ; if ( phut  >= 60 ) { ++ gio ;  phut  -= 60 ; } // tra ve gia tri return  T ; } }; int  main () { ThoiGian  T1 ( 6 , 59 ),  T2 ( 19 , 24 ); ++ T1 ; // tang T1  T1 . hienthiTG (); // hien thi T1 ++ T1 ; // tang T1 mot lan lua  T1 . hienthiTG (); // hien thi T1  T2 ++; // tang T2  T2 . hienthiTG (); // hien thi T2  T2 ++; // tang T2 mot lan lua  T2 . hienthiTG (); // hien thi T2 return 0 ; } 

Compiling and running the above C ++ program will produce the following results:

According to Tutorialspoint

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