all,I write a code like this in my mac os x 10.8,and when I use “gcc use_new.cpp -o use_new ” to compile it,but it throws wrong message like this:
Undefined symbols for architecture x86_64:
"std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))", referenced from:
_main in ccr2vrRQ.o
"std::basic_ostream<char, std::char_traits<char> >::operator<<(void const*)", referenced from:
_main in ccr2vrRQ.o
"std::basic_ostream<char, std::char_traits<char> >::operator<<(double)", referenced from:
_main in ccr2vrRQ.o
"std::basic_ostream<char, std::char_traits<char> >::operator<<(int)", referenced from:
_main in ccr2vrRQ.o
"std::basic_ostream<char, std::char_traits<char> >::operator<<(unsigned long)", referenced from:
_main in ccr2vrRQ.o
"std::ios_base::Init::Init()", referenced from:
__static_initialization_and_destruction_0(int, int) in ccr2vrRQ.o
"std::ios_base::Init::~Init()", referenced from:
__static_initialization_and_destruction_0(int, int) in ccr2vrRQ.o
"std::cout", referenced from:
_main in ccr2vrRQ.o
"std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from:
_main in ccr2vrRQ.o
"std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)", referenced from:
_main in ccr2vrRQ.o
"operator delete(void*)", referenced from:
_main in ccr2vrRQ.o
"operator new(unsigned long)", referenced from:
_main in ccr2vrRQ.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
and when I use “g++ use_new.cpp -o use_new” is OK,who can help me!? thank you!
#include <iostream>
struct fish
{
float weight;
int id;
int kind;
};
int main()
{
using namespace std;
int* pt = new int;
*pt = 1001;
cout<<"int: "<<*pt<<"in location: "<<pt<<endl;
double* pd = new double;
*pd = 100000001.0;
cout<<"double: "<<*pd<<"in location: "<<pd<<endl;
cout<<"int point pt is length "<<sizeof(*pt)<<endl;
cout<<"double point pd is length "<<sizeof(*pd)<<endl;
delete pt;
delete pd;
cout<<(int *)"How are you!"<<endl;
return 0;
}