You have right. Meanwhile I corrct it my self too. Sriharsha, thank you anyway for your help.
Where do you come from, Sriharsha?
Sriharsha wrote:
OOps,
add this to your base.c
Base::Base(){ } // This defines your default constructor.
Graf László wrote:
I did all what you said Sriharsha. Whit file names changed, Makefile modified I get the same message:
1. step: rm *.o
2. step: g++ -c base.cpp -o base.o
3. step: g++ axf.cpp base.o -o axf.o
/tmp/ccGshWGj.o(.text+0x4a): In function `main': : undefined reference to `Base::Base[in-charge]()'
collect2: ld returned 1 exit status
Sriharsha wrote:
Hi Laszlo,
firstly, I suggest that you change the extension of your code files from .c to .cpp.
then, in your make file: Change: g++ axf.c -o axf.o to g++ axf.cpp base.o -o axf.o
Harsha.
Graf László wrote:
Hi Gurus,
I am Laszlo from Hungary. Please, take a look at these files:
--- The main file ---------------------------------------------------------------------
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "base.h"
int main(int argc, char* argv[])
{
system("clear");
Base* b = new Base();
printf("\n---------- %s ---------------\n", b->toString());
delete b;
return 0;
}//main
--- The base.h file ---------------------------------------------------------------------
#ifndef __BASE
#define __BASE
class Base{
private:
char* _str;
public: Base(); Base(Base &); ~Base();
char* toString(); char* toHtml(); }; #endif
--- The base.c file ---------------------------------------------------------------------
#include "base.h"
using namespace std;
Base::Base(Base &s){ }
Base::~Base(){ }
char* Base::toString() { char* rv = "this is the toString()"; return rv; }
char* Base::toHtml() { char* rv = "this is the toHtml()"; return rv; }
--- The Makefile file ---------------------------------------------------------------------
compile :
g++ -c base.c -o base.o
g++ axf.c -o axf.o
clear :
clear
clean :
rm *.o
run :
./axf.o
--------------------------------------------------------------------------------------------
After the command make clear clean compile run
I got these error messages:
rm *.o g++ -c base.c -o base.o g++ axf.c -o axf.o
/tmp/cc2K7HjB.o(.text+0x4a): In function `main': : undefined reference to `Base::Base[in-charge]()'
/tmp/cc2K7HjB.o(.text+0x88): In function `main': : undefined reference to `Base::toString()' /tmp/cc2K7HjB.o(.text+0xaf): In function `main': : undefined reference to `Base::~Base [in-charge]()' collect2: ld returned 1 exit status
make: *** [compile] Error 1
Could somebody tell me what is wrong there? Thank you.
-- Graf László - bitfaragó http://grafl.port5.com/
