Help with referencing

**daisy244** · 07-28-2004

Originally Posted by nbk

bman - does vc++ have a place to add directories to look for for include files(as does dev-c++)

this is a beginning c++ course. deitel vsn. 4 it came with the visual c++ compiler

**prog-bman** · 07-28-2004

grr i know why :P
try including test.h and not time3.h

and nbk when you create a project with vc++ the directory you put it in is searched as well as the include directory

**daisy244** · 07-28-2004

Originally Posted by prog-bman

grr i know why :P
try including test.h and not time3.h

and nbk when you create a project with vc++ the directory you put it in is searched as well as the include directory

Duh, that makes sense....its pointing to the file. Well bad news I got these 10 errors.

Linking...
test.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::setTime(int,int,int)" (?setTime@Time@@QAEXHHH@Z)
test.obj : error LNK2001: unresolved external symbol "public: int __thiscall Time::getHour(void)" (?getHour@Time@@QAEHXZ)
test.obj : error LNK2001: unresolved external symbol "public: int __thiscall Time::getMinute(void)" (?getMinute@Time@@QAEHXZ)
test.obj : error LNK2001: unresolved external symbol "public: int __thiscall Time::getSecond(void)" (?getSecond@Time@@QAEHXZ)
test.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::setSecond(int)" (?setSecond@Time@@QAEXH@Z)
test.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::setMinute(int)" (?setMinute@Time@@QAEXH@Z)
test.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time::setHour(int)" (?setHour@Time@@QAEXH@Z)
test.obj : error LNK2001: unresolved external symbol "public: __thiscall Time::Time(int,int,int)" (??0Time@@QAE@HHH@Z)
test.obj : error LNK2001: unresolved external symbol "public: void __thiscall Time:

rintStandard(void)" (?printStandard@Time@@QAEXXZ)
Debug/test.exe : fatal error LNK1120: 9 unresolved externals
Error executing link.exe.

test.exe - 10 error(s), 0 warning(s)

**prog-bman** · 07-28-2004

there are the errors i got basically that means you are calling a function that hasn't been defined yet

**daisy244** · 07-28-2004

Originally Posted by prog-bman

there are the errors i got basically that means you are calling a function that hasn't been defined yet

ok I think I got it. thanks alot

**daisy244** · 07-29-2004

Originally Posted by daisy244

ok I think I got it. thanks alot

Ok I figured it out and got it to work. Now I have to change this code in the header to include a tick memeber function that increments the time stored in the time object by one second any suggestions? By what I am looking at.....it looks like it should do it already. but I think in my cpp part it is only changing it by minutes? Am I right?

Code:

Fig. 6.18: time3.h 
// Declaration of class Time. 
// Member functions defined in time3.cpp 

// prevent multiple inclusions of header file 
#ifndef TIME3_H  
#define TIME3_H 

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 
   void setMinute( int ); // set minute 
   void setSecond( int ); // set second 

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

   void printUniversal(); // output universal-time format 
   void printStandard();  // output standard-time format 

private: 
   int hour;              // 0 - 23 (24-hour clock format) 
   int minute;            // 0 - 59 
   int second;            // 0 - 59 

}; // end clas Time 

#endif

**prog-bman** · 07-29-2004

These are just prototypes can you show me the definitions?

**daisy244** · 07-29-2004

Originally Posted by prog-bman

These are just prototypes can you show me the definitions?

With the header file already stored in its directory: I put this in the cpp source file built it and it gave me the output I was searching for:

Code:

// Fig. 6.19: time3.cpp
// Member-function definitions for Time class.
#include <iostream>

using std::cout;

#include <iomanip>

using std::setfill;
using std::setw;

// include definition of class Time from time3.h
#include "time3.h"

// constructor function to initialize private data;
// calls member function setTime to set variables;
// default values are 0 (see class definition)
Time::Time( int hr, int min, int sec ) 
{ 
   setTime( hr, min, sec ); 

} // end Time constructor

// set hour, minute and second values
void Time::setTime( int h, int m, int s )
{
   setHour( h );
   setMinute( m );
   setSecond( s );

} // end function setTime

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

} // end function setHour

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

} // end function setMinute

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

} // end function setSecond

// return hour value
int Time::getHour() 
{ 
   return hour; 

} // end function getHour

// return minute value
int Time::getMinute() 
{
   return minute; 

} // end function getMinute

// return second value
int Time::getSecond() 
{ 
   return second;
   
} // end function getSecond

// print Time in universal format
void Time::printUniversal()
{
   cout << setfill( '0' ) << setw( 2 ) << hour << ":"
        << setw( 2 ) << minute << ":"
        << setw( 2 ) << second;

} // end function printUniversal

// print Time in standard format
void Time::printStandard()
{
   cout << ( ( hour == 0 || hour == 12 ) ? 12 : hour % 12 )
        << ":" << setfill( '0' ) << setw( 2 ) << minute
        << ":" << setw( 2 ) << second 
        << ( hour < 12 ? " AM" : " PM" );

} // end function printStandard
// Fig. 6.20: fig06_20.cpp
// Demonstrating the Time class set and get functions
#include <iostream>

using std::cout;
using std::endl;

// include definition of class Time from time3.h
#include "time3.h"

void incrementMinutes( Time &, const int );  // prototype

int main()
{
   Time t;              // create Time object

   // set time using individual set functions
   t.setHour( 17 );     // set hour to valid value
   t.setMinute( 34 );   // set minute to valid value
   t.setSecond( 25 );   // set second to valid value

   // use get functions to obtain hour, miunute and second
   cout << "Result of setting all valid values:\n" 
        << "  Hour: " << t.getHour()
        << "  Minute: " << t.getMinute()
        << "  Second: " << t.getSecond();

   // set time using individual set functions
   t.setHour( 234 );    // invalid hour set to 0
   t.setMinute( 43 );   // set minute to valid value
   t.setSecond( 6373 ); // invalid second set to 0

   // display hour, minute and second after setting 
   // invalid hour and second values
   cout << "\n\nResult of attempting to set invalid hour and"
        << " second:\n  Hour: " << t.getHour()
        << "  Minute: " << t.getMinute()
        << "  Second: " << t.getSecond() << "\n\n";

   t.setTime( 11, 58, 0 );    // set time
   incrementMinutes( t, 3 );  // increment t's minute by 3

   return 0;

} // end main

// add specified number of minutes to a Time object
void incrementMinutes( Time &tt, const int count )
{
   cout << "Incrementing minute " << count
        << " times:\nStart time: ";
   tt.printStandard();

   for ( int i = 0; i < count; i++ ) {
      tt.setMinute( ( tt.getMinute() + 1 ) % 60 );  

      if ( tt.getMinute() == 0 )
         tt.setHour( ( tt.getHour() + 1 ) % 24 );

      cout << "\nminute + 1: ";
      tt.printStandard();

   } // end for

   cout << endl;

} // end function incrementMinutes

**prog-bman** · 07-29-2004

Yep i just kept seeing declarations and no definations that looks good to me

**daisy244** · 07-29-2004

Originally Posted by prog-bman

Yep i just kept seeing declarations and no definations that looks good to me

what do you mean by definitions?

**nbk** · 07-29-2004

A definition is where you define the function(correct?)

e.g.

Code:

int main()    // Define main()
{                 //   Still...
     int var;       //   :o          
{                // yay


int main();           //declare main(which you never do :), unless the compiler requires it)

**sean** · 07-29-2004

Declarations and prototype are when you just have the functions name, return type, and parameters, but no code for the functions. It's like declaring a variable (int x) but not defining it yet (x = 5). Show the code to your functions.

edit: nbk is basically correct, but I wouldn't recommend looking at that code.

**daisy244** · 07-29-2004

Originally Posted by sean_mackrory

Declarations and prototype are when you just have the functions name, return type, and parameters, but no code for the functions. It's like declaring a variable (int x) but not defining it yet (x = 5). Show the code to your functions.

edit: nbk is basically correct, but I wouldn't recommend looking at that code.

This program is referencing this header file:

Code:

Fig. 6.18: time3.h 
// Declaration of class Time. 
// Member functions defined in time3.cpp 

// prevent multiple inclusions of header file 
#ifndef TIME3_H  
#define TIME3_H 

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 
   void setMinute( int ); // set minute 
   void setSecond( int ); // set second 

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

   void printUniversal(); // output universal-time format 
   void printStandard();  // output standard-time format 

private: 
   int hour;              // 0 - 23 (24-hour clock format) 
   int minute;            // 0 - 59 
   int second;            // 0 - 59 

}; // end clas Time 

#endif

Notice that it says Member functions defined in time3.cpp

**daisy244** · 07-29-2004

Ive got to change time.h to increment with a tick command to make the output increment in seconds.

**daisy244** · 07-29-2004

Originally Posted by daisy244

Ive got to change time.h to increment with a tick command to make the output increment in seconds.

Are you through with helping me? Let me know?

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