Issue when compilin cpp program on ubuntu's shell [duplicate] - c++

Question

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What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Error "undefined reference to 'std::cout'"
(6 answers)
Closed 6 years ago.
So I was trying out the Linux C++ compiler and this happened while compiling the following code:
#include <iostream>
using namespace std;
int main(){
cout<<"Hello World!\n"<<endl;
return 0;
}
ceibal#ceibal:~$ gcc HelloWorld.cpp
/tmp/cc78Dkhk.o: In function `main':
HelloWorld.cpp:(.text+0xa): undefined reference to `std::cout'
HelloWorld.cpp:(.text+0xf): 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*)'
HelloWorld.cpp:(.text+0x14): 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> >&)'
HelloWorld.cpp:(.text+0x1c): 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/cc78Dkhk.o: In function `__static_initialization_and_destruction_0(int, int)':
HelloWorld.cpp:(.text+0x4a): undefined reference to `std::ios_base::Init::Init()'
HelloWorld.cpp:(.text+0x4f): undefined reference to `std::ios_base::Init::~Init()'
collect2: ld devolvió el estado de salida 1
ceibal#ceibal:~$ pico HelloWorld.cpp
ceibal#ceibal:~$ gcc HelloWorld.cpp
HelloWorld.cpp:3:1: error: expected ‘;’ before ‘int’
ceibal#ceibal:~$ pico HelloWorld.cpp
ceibal#ceibal:~$ gcc HelloWorld.cpp
/tmp/ccIivRal.o: In function `main':
HelloWorld.cpp:(.text+0xa): undefined reference to `std::cout'
HelloWorld.cpp:(.text+0xf): 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*)'
HelloWorld.cpp:(.text+0x14): 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> >&)'
HelloWorld.cpp:(.text+0x1c): 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/ccIivRal.o: In function `__static_initialization_and_destruction_0(int, int)':
HelloWorld.cpp:(.text+0x4a): undefined reference to `std::ios_base::Init::Init()'
HelloWorld.cpp:(.text+0x4f): undefined reference to `std::ios_base::Init::~Init()'
collect2: ld devolvió el estado de salida 1
I tried with the same program but on C and it worked perfectly, but as soon as I translated it to c++ this occurred.

Answer 1

$ gcc HelloWorld.cpp
This invokes C compiler but your code is in C++. Use g++ to invoke C++ compiler.
$ g++ HelloWorld.cpp