Help with referencing

This is a discussion on Help with referencing within the C++ Programming forums, part of the General Programming Boards category; Originally Posted by nbk bman - does vc++ have a place to add directories to look for for include files(as ...

  1. #16
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    Quote 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

  2. #17
    Sweet
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    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
    Woop?

  3. #18
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    Quote 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)

  4. #19
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    there are the errors i got basically that means you are calling a function that hasn't been defined yet
    Woop?

  5. #20
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    Quote 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

  6. #21
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    Quote 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

  7. #22
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    These are just prototypes can you show me the definitions?
    Woop?

  8. #23
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    Quote 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

  9. #24
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    Yep i just kept seeing declarations and no definations that looks good to me
    Woop?

  10. #25
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    Quote 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?

  11. #26
    nbk
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    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)
    Last edited by nbk; 07-29-2004 at 09:50 PM.

  12. #27
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    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.

  13. #28
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    Quote 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

  14. #29
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    Ive got to change time.h to increment with a tick command to make the output increment in seconds.

  15. #30
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    Quote 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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