Help with Linker error, while using multiple inheritance
Hi
I have been trying to compile this code, in this I had a class clocktype with its header and implementation file and now I have to extend this class to be able to implement the function timezone in it. This is a program where I have to use two header files in my derived class.
I am posting my code here:
Code:
//header file clocktype
#ifndef h_clocktype
#define h_clocktype
#include<string>
using namespace std;
class clocktype
{
public:
void settime(int hours, int minutes, int seconds);
void gettime(int& hours, int& minutes, int& seconds);
void printtime();
void incseconds();
void incminutes();
void inchours();
clocktype (int hours, int minutes, int seconds);
clocktype();
protected:
int hr;
int min;
int sec;
};
#endif
// implemnetation file
#include<iostream>
#include<conio.h>
#include "clocktype.h"
using namespace std;
void clocktype::settime(int hours, int minutes, int seconds)
{
if(0<= hours && hours<24)
hr=hours;
else
hr=0;
if(0<=minutes && minutes<60)
min=minutes;
else
min=0;
if (0<=seconds && seconds<60)
sec=seconds;
else
sec=0;
}
void clocktype::gettime(int& hours, int& minutes, int& seconds)
{
hours=hr;
minutes=min;
seconds=sec;
}
void clocktype::printtime()
{
if(hr<10)
cout<<"0";
cout<<hr<<":";
if(min<10)
cout<<"0";
cout<<min<<":";
if(sec<10)
cout<<"0";
cout<<sec;
}
void clocktype::inchours()
{
hr++;
if(hr<23)
hr=0;
}
void clocktype::incminutes()
{
min++;
if(min<59)
min=0;
inchours();
}
void clocktype::incseconds()
{
sec++;
if(sec<59)
sec=0;
incminutes();
}
clocktype::clocktype()
{
hr=0;
min=0;
sec=0;
}
clocktype::clocktype(int hours, int minutes, int seconds)
{
if(0<= hours && hours<24)
hr=hours;
else
hr=0;
if(0<=minutes && minutes<60)
min=minutes;
else
min=0;
if (0<=seconds && seconds<60)
sec=seconds;
else
sec=0;
}
// main function
int main()
{
clocktype myclock;
myclock.settime( 12, 14, 40);
cout<<" The time now is : ";
myclock.printtime();
myclock.settime( 24, 60, 60);
cout<<"\n The time now is : ";
myclock.printtime();
getch();
}
And now I have the derived class
Code:
#ifndef h_clocktype2
#define h_clocktype2
#include<iostream>
#include"clocktype.h"
using namespace std;
enum zonetype {GMT, EST, PST, IST, CET};
class clocktype2: public clocktype
{
public:
void settime(int hours, int minutes, int seconds,zonetype timezone);
void printtime();
clocktype2 (int hours, int minutes, int seconds, zonetype timezone);
clocktype2();
private:
zonetype tz;
};
#endif
#include<iostream>
#include<conio.h>
#include"clocktype.h"
#include"clocktype2.h"
using namespace std;
void clocktype2::settime(int hours, int minutes, int seconds, zonetype timezone)
{
hours=hr;
minutes=min;
seconds=sec;
timezone=tz;
}
void clocktype2::printtime()
{
switch(tz)
{
case GMT:
cout<<"GMT";
break;
case EST:
cout<<"EST";
break;
case PST:
cout<<"PST";
break;
case IST:
cout<<"IST";
break;
case CET:
cout<<"CET";
break;
}
}
clocktype2::clocktype2(){
hr=0;
min=0;
sec=0;
tz=GMT;
}
clocktype2::clocktype2(int hours, int minutes, int seconds, zonetype timezone)
{
hours=hr;
minutes=min;
seconds=sec;
timezone=tz;
}
int main()
{
clocktype2 clock;
clock.settime( 12, 14, 40, GMT);
cout<<" The time now is : ";
clock.printtime();
clock.settime( 24, 60, 60, IST);
cout<<"\n The time now is : ";
clock.printtime();
getch();
}
Now when I try to run this program it gives me the following error:
------ Build started: Project: lab-4, Configuration: Debug Win32 ------
Linking...
clocktypeimp2.obj : error LNK2019: unresolved external symbol "public: __thiscall clocktype::clocktype(void)" (??0clocktype@@QAE@XZ) referenced in function "public: __thiscall clocktype2::clocktype2(void)" (??0clocktype2@@QAE@XZ)
C:\Documents and Settings\user\My Documents\Visual Studio 2008\Projects\lab-4\Debug\lab-4.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://c:\Documents and Settings\user\My Documents\Visual Studio 2008\Projects\lab-4\lab-4\Debug\BuildLog.htm"
lab-4 - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
