加上using namespace std;后出现
引用: [raody@ServerLinux cpractice]$ gcc template.cpp /tmp/ccbFTZkU.o(.text+0x22): In function `main': : undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)' /tmp/ccbFTZkU.o(.text+0x33): In function `main': : undefined reference to `std::cout' /tmp/ccbFTZkU.o(.text+0x38): In function `main': : undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(int)' /tmp/ccbFTZkU.o(.text+0x41): In function `main': : undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(int)' /tmp/ccbFTZkU.o(.text+0x4a): In function `main': : undefined reference to `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> >&))' /tmp/ccbFTZkU.o(.text+0x76): In function `__static_initialization_and_destruction_0(int, int)': : undefined reference to `std::ios_base::Init::Init[in-charge]()' /tmp/ccbFTZkU.o(.text+0xa5): In function `__tcf_0': : undefined reference to `std::ios_base::Init::~Init [in-charge]()' /tmp/ccbFTZkU.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0' collect2: ld returned 1 exit status [raody@ServerLinux cpractice]$
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