C++ on ubuntu hello world - c++

Question

I'm trying to write my first code on ubuntu terminal using c++
.I created a new cpp file named aaa by
"nano aaa.cpp"
then inside I wrote
#include<iostream>
using std::cout;
using std::endl;
int main(int argc, car** argv)
{
cout << "hello" << endl;
return 0;
}
i saved and got out but when i tried typing
g++ aaa.cpp
I got the error
error: ‘endl’ was not declared in this scope
cout << "hello" << endl;
where did I go wrong
I tried
$ sudo apt-get remove g++ libstdc++-6.4.7-dev
$ sudo apt-get install build-essential g++-multilib
but it was no good
any help?

Answer 1

Stylistically, I prefer to be explicit: std::cout and std::endl.
#include <iostream>
int main(int argc, char** argv) {
std::cout << "hello" << std::endl;
return 0;
}
This also fixes a tyo of yours: char, not car and repairs the #include.
This works as expected:
$ g++ -Wall -pedantic -o foo2 foo2.cpp
$ ./foo2
hello
$
If you wanted to, you could also use
using namespace std;
but as stated, I prefer to more explicit form.
Edit: Nothing as much fun as debating the beancounters. OP question is likely having _another error he is not sharing. His code, repaired for char actually builds:
$ cat foo3.cpp
#include <iostream>
using std::cout;
using std::endl;
int main(int argc, char** argv) {
cout << "hello" << endl;
return 0;
}
$ g++ -Wall -pedantic -o foo3 foo3.cpp
$ ./foo3
hello
$
Ubuntu 16.04, g++ 5.4.0

Answer 2

First, make sure you have the tools you need to be able to compile a C++ code on Ubuntu. For that run the following code in the command line :
This line will install all the basic stuff you need for compiling a C++ code, it will install C, C++, and make.
sudo apt-get install build-essential
Now that you have all you need, I will suggere to explicetely using std::cout / std::endl . That way you don't import all the stuff available under the namespace std that you are not using. Using std::cout / std::endl shows clearly the origin the instance you are using.
Notice : you have an error in the main function argument, namely : car, it should be char
#include<iostream>
int main(int argc, char** argv)
{
std::cout << "hello" << std::endl;
return 0;
}
Now you can compile and run your code this way :
in this example I'm calling the executable file "hello"
g++ -Wall -o hello aaa.cpp
./hello