C++ ，无法让它运行 hello world 代码

Question

First I was not able to install GWmin gcc. Now that I am done with that I have a new issue the build says there is nothing to build even when I have put a hello world programme in there.

#include <iostream>
   int main()
   {
        cout << "hello!! World\n"
   }
   return 0;

Another thing that I noticed it contrary to the video link I shared here my eclipse is not picking up a close bracket when I type in the opening bracket no color change of the word include after# pls help.

A video i am following to learn c++

Answer 1

First , try, (underneath #include) typing

using namespace std;

to even everything out, and I think you may want to change

cout<<"Hello!! World \n"

to

cout<<"Hello!! World \n"<< endl;

(last characters a lowercase L, in case your font type makes it look like a 1)

Second , make sure that you're using g++ , instead of gcc (Happens to me all the time)

Lastly , if that doesn't work, move the return 0; into the brackets,

that should fix everything

Answer 2

There are three mistakes in this small hello world program.

1. std namespace does not provide for cout . So change to std::cout .
2. semicolon( ; ) is missing, end of cout line.
3. return statement should inside curly brackets {}.

After making above changes your code

#include <iostream>
   int main()
   {
        std::cout << "hello!! World\n";
        return 0;
   }

You are using \\n for new line. Since this is 'C++' code, It is recommended to use std::endl for new line.

Answer 3

If you working with Eclipse on Windows platform, try to install TDM-GCC MinGW Compiler. It just a few clicks setup. Don't forget to choose MinGW compiler, when you create a new c++ project in Eclipse