类计时器中的重载前缀和后缀增量。调试时出现问题

我需要为类Timer重载增量。我班的成员只有几分钟和几秒钟。

#include <iostream>
#include <conio.h>
using namespace std;

class Timer
{
private:
  int minutes;           
  int seconds;            

public:

  Time(){
     minutes = 0;
     seconds = 0;

  }
  Time(int m, int s){
     minutes = m;
     seconds = s;

  }

  void displayTime()
  {
     cout << "M: " << hours << " S:" << minutes <<endl;
  }

  Time operator++ ()  
  {
     ++seconds;          
     if(seconds >= 60)  
     {
        ++minutes;
        seconds -= 60;
     }
     return Time(minutes, seconds);
  }

  Time operator++( int )         
  {

     Time T(minutes, seconds);

     ++seconds;                    
     if(seconds >= 60)
     {
        ++minutes;
        seconds -= 60;
     }

     return T; 
  }
  };
  int main()
  {
  Time T1(18, 23), T2(19,12);

  ++T1;                    
  T1.displayTime();       
  ++T1;                   
  T1.displayTime();      

  T2++;                  
  T2.displayTime();      
  T2++;                   
  T2.displayTime();       
  _getch()
  }

当我调试时，它说

编译器：默认编译器构建Makefile：“ C：\ Dev-Cpp \ Makefile.win”正在执行make ... make.exe -f“ C：\ Dev-Cpp \ Makefile.win”所有g ++。exe -c main.cpp -o main.o -I“ C：/Dev-Cpp/lib/gcc/mingw32/3.4.2/include” -I“ C：/ Dev-Cpp / include / c ++ / 3.4.2 / backward” -I“ C：/ Dev-Cpp / include / c ++ / 3.4.2 / mingw32“ -I” C：/ Dev-Cpp / include / c ++ / 3.4.2“ -I” C：/ Dev-Cpp / include“

main.cpp:13: error: ISO C++ forbids declaration of `Time' with no type

main.cpp:18: error: ISO C++ forbids declaration of `Time' with no type
main.cpp:29: error: ISO C++ forbids declaration of `Time' with no type

main.cpp:29: error: expected `;' before "operator"
main.cpp:40: error: expected `;' before "Time"
main.cpp:40: error: ISO C++ forbids declaration of `Time' with no type
main.cpp:40: error: expected `;' before "operator"

main.cpp:54: error: expected `;' before '}' token
main.cpp: In member function `void Timer::displayTime()':
main.cpp:26: error: `hours' undeclared (first use this function)

main.cpp:26: error: (Each undeclared identifier is reported only once for each function it appears in.)
main.cpp: At global scope:
main.cpp:56: error: new types may not be defined in a return type
main.cpp:56: error: extraneous `int' ignored
main.cpp:56: error: `main' must return `int'
main.cpp: In function `int main(...)':
main.cpp:57: error: `Time' undeclared (first use this function)
main.cpp:57: error: expected `;' before "T1"
main.cpp:59: error: `T1' undeclared (first use this function)
main.cpp:64: error: `T2' undeclared (first use this function)
main.cpp:69: error: expected `;' before '}' token

make.exe: *** [main.o] Error 1

Execution terminated