When I compiled this program...
#include<iostream>
using namespace std;
class base
{
public:
virtual void show()
{
cout<<"\n Base class show:";
}
void display()
{
cout<<"\n Base class display:" ;
}
};
class drive:public base
{
public:
void display()
{
cout<<"\n Drive class display:";
}
void show()
{
cout<<"\n Drive class show:";
}
};
int main()
{
base obj1;
base *p;
cout<<"\n\t P points to base:\n" ;
p=&obj1;
p->display();
p->show();
cout<<"\n\n\t P points to drive:\n";
drive obj2;
p=&obj2;
p->display();
p->show();
return 0;
}I got these messages.. Can anyone tell me what Im doing wrong?
/tmp/cckMKZwu.o: In function `main':
virtual.cpp:(.text+0x1a): undefined reference to `std::cout'
virtual.cpp:(.text+0x1f): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
virtual.cpp:(.text+0x50): undefined reference to `std::cout'
virtual.cpp:(.text+0x55): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/cckMKZwu.o: In function `__static_initialization_and_destruction_0(int, int)':
virtual.cpp:(.text+0xb6): undefined reference to `std::ios_base::Init::Init()'
virtual.cpp:(.text+0xbb): undefined reference to `std::ios_base::Init::~Init()'
/tmp/cckMKZwu.o: In function `base::show()':
virtual.cpp:(.text._ZN4base4showEv[base::show()]+0x12): undefined reference to `std::cout'
virtual.cpp:(.text._ZN4base4showEv[base::show()]+0x17): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/cckMKZwu.o: In function `base::display()':
virtual.cpp:(.text._ZN4base7displayEv[base::display()]+0x12): undefined reference to `std::cout'
virtual.cpp:(.text._ZN4base7displayEv[base::display()]+0x17): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/cckMKZwu.o: In function `drive::show()':
virtual.cpp:(.text._ZN5drive4showEv[drive::show()]+0x12): undefined reference to `std::cout'
virtual.cpp:(.text._ZN5drive4showEv[drive::show()]+0x17): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/tmp/cckMKZwu.o:(.rodata._ZTI5drive[typeinfo for drive]+0x0): undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
/tmp/cckMKZwu.o:(.rodata._ZTI4base[typeinfo for base]+0x0): undefined reference to `vtable for __cxxabiv1::__class_type_info''
Please help. gcc -v gives:
gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)