???????????????У??????????????UNIX?±??????hello world ???????????UNIX???￡??????????????IO??
??????????????????????????????ο?????:<<C++ Primer>>??
??????????????????????????“Progr1.cpp”
?????????????Progr1.cpp??д??main???????????cin ??cout ??????IO??????????????
#include <iostream>//????????????? iostream ????????????????????????????????????????????????????????
int main()
{
std::cout<<"enter two numbers:"<< std::endl;
int v1??v2;
std::cin>>v1>>v2;
std::cout<<"The num of"<<v1 <<"and"<<v2<< "is" <<v1 + v2<<std::endl;
return 0;
}
?????????????????????????cin ??cout ???÷???Ч?????????????????????????????????include <iostream> ?????????????????????
??????????????????????????????
????std::cout ?? std::endl?????? ?? cout ?? endl???? std:: ???? cout ?? endl ?????????????? std ?? ?????????????????????????????ж?????????????????????????
??????????????????????
?????????????????????????????????
????????????????????
????llbt$ cc Progr1.cpp
???????????￡?
????Undefined symbols for architecture x86_64:
????"std::__1::locale::use_facet(std::__1::locale::id&) const"?? referenced from:
????std::__1::basic_ostream<char?? std::__1::char_traits<char> >& std::__1::endl<char?? std::__1::char_traits<char> >(std::__1::basic_ostream<char?? std::__1::char_traits<char> >&) in Progr1-74ce42.o
????std::__1::basic_ostream<char?? std::__1::char_traits<char> >& std::__1::__put_character_sequence<char?? std::__1::char_traits<char> >(std::__1::basic_ostream<char?? std::__1::char_traits<char> >&?? char const*?? unsigned long) in Progr1-74ce42.o....
??????ν????????????????????????????????????????????????????????????ɡ???????????????????е????????????????????????????????????
?????????????·????????????????????????????????????????????????????/google???ɡ?
???????·?????3???????????????????????????IO ??.
?????????????????“unix ????? iostream”
????????????????????????????????????????????? ??????????????????????stdc++?????????￡?
????llbt$ cc -lstdc++ Progr1.cpp
????????????????????????? iostream ??????????????￡???iostream?????? C++ ????? libCstd ??.
????????? IO?????y????????