can some one figure out what is the error message is about in my code

[ayman723]

hi;

I have this code in my book and when I copied it into my compiler into two files, one is header and the other is .cpp. it gives me an error, I'm sure I copied it right but can't figure out the error.

here is my code:

Time.h
// declaration of class time.
// membar functions defined in Time.cpp

// prevent multiple inclusions of header file

#ifndef TIME_H
#define TIME_H

// Time abstract data type definition

class Time

{
public:
Time( int=0, int=0, int=0 ); //default constructor

// set functions

void setTime ( int,int,int); // set hour, minute, second
void setHour ( int ); // set hour ( after validation )
void setMinute ( int ); // set minute ( after validation )
void setSecond ( int ); // set second ( after validation )

// get functions
int getHour(); // return hour
int getMinute(); // return minute
int getSecond(); // return second

void printUniversal();// print time in universal time format


private:

int hour; // 0-23 ( 24 hour clock format )
int minute; // 0-59
int second; // 0-59
}; // end class Time


#endif

------------------------------------------------------------------------------------------------

Time.cpp
#include <iostream>
using std::cout;
#include <iomanip>
using std::setfill;
using std::setw;

#include "Time.h" // include definition from class Time from Time.h

Time::Time( int hr, int min, int sec )

{
setTime( hr, min, sec );

}

void Time::setTime( int h, int m , int s )

{
setHour (h);
setMinute (m);
setSecond (s);
}

void Time::setHour ( int h )
{
hour = ( h >= 0 && h < 24 ) ? h : 0;

}

void Time::setMinute ( int m )
{
minute = ( m >= 0 && m < 60 ) ? m : 0;

}

void Time::setSecond ( int s )
{
second = ( s >= 0 && s < 60 ) ? s : 0;

}

int Time::getHour()
{
return hour;
}

int Time::getMinute()
{
return minute;
}
int Time::getSecond()

{
return second;
}

void Time::printUniversal()

{
cout<< setfill( '0' ) << setw(2)<<getHour()<<":"<<setw(2)<<getMinute()<<":" <<setw(2)<<getSecond();

}

---------------------------------------------------------------------------------------------------------------

the error message:

------ Build started: Project: example2, Configuration: Debug Win32 ------
Linking...
LIBCMT.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
C:\Documents and Settings\Owner\My Documents\Visual Studio 2005\Projects\example2\Debug\example2.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://c:\Documents and Settings\Owner\My Documents\Visual Studio 2005\Projects\example2\example2\Debug\BuildLog.htm "
example2 - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
--------------------------------------------------------------------------------------------------

your fast responce is highly appreciated. thanks in advance for your cooperation.

ayman723

[horace1]

you missed #endif at the end of the header file

// declaration of class time.
// membar functions defined in Time.cpp
 
// prevent multiple inclusions of header file
 
#ifndef TIME_H
#define TIME_H
 
// Time abstract data type definition
 
class Time
 
{
public:
Time( int=0, int=0, int=0 ); //default constructor
 
// set functions
 
void setTime ( int,int,int); // set hour, minute, second
void setHour ( int ); // set hour ( after validation )
void setMinute ( int ); // set minute ( after validation )
void setSecond ( int ); // set second ( after validation )
 
// get functions
int getHour(); // return hour
int getMinute(); // return minute
int getSecond(); // return second
 
void printUniversal();// print time in universal time format
 
 
private:
 
int hour; // 0-23 ( 24 hour clock format )
int minute; // 0-59
int second; // 0-59
}; // end class Time
 
#endif   // *** missing  
 
 

your error message indicated that you did not have a main() function, e.g.

 
#include <iostream>
using std::cout;
 
#include <iomanip>
using std::setfill;
using std::setw;
 
#include "Time.h" // include definition from class Time from Time.h
 
Time::Time( int hr, int min, int sec )
 
{
setTime( hr, min, sec );
 
}
 
void Time::setTime( int h, int m , int s )
 
{
setHour (h);
setMinute (m);
setSecond (s);
}
 
void Time::setHour ( int h )
{
hour = ( h >= 0 && h < 24 ) ? h : 0;
 
}
 
void Time::setMinute ( int m )
{
minute = ( m >= 0 && m < 60 ) ? m : 0;
 
}
 
void Time::setSecond ( int s )
{
second = ( s >= 0 && s < 60 ) ? s : 0;
 
}
 
int Time::getHour()
{
return hour;
}
 
int Time::getMinute()
{
return minute;
}
int Time::getSecond()
 
{
return second;
}
 
void Time::printUniversal()      // ** missing :
{
cout<< setfill( '0' ) << setw(2)<<getHour()<<":"<<setw(2)<<getMinute()<<":"<<setw(2)<<getSecond();
 
}
 
// ** added a main()
int main()
{
    Time t=Time(9,30,25);
    t.printUniversal();
    return 0;
}
 

[ayman723]

thanks a million for your help. :)