Hello World Code

[Markoman01027]

Hey Guys,

First day coding in my C++ class at high school. The teacher gave us a sample code of the Hello World code that she typed up, and it was wrong. So I went online to reference the code and I found many different ways to write it. Just wondering if there is a proper way of using it.

My second question is, do I have to use the "\n" command after each Cout statement? What about "endl" command. Do I have to use that too after each cout statement? or can I simply just use ";" for the end of the line.

I have two links here, showing you different way to code the Hello World program.

Tell me which way is the proper way. I used this:

"cout <<"\n hello world!\n"; and my teacher said "That is old code" I don't think it matters, aslong as you get the program to do what you intended it to do.

I found different ways of writing the code. One way of only using the << Brackets on the left side and not on the right side ..Example:

"cout <<"\n hello world!\n";"

And I also heard that you have to use it at the right side aswell.. Example:

""cout <<"\n hello world!\n << ";"

The extra " is so the website doesn't read the code or whatever.

Code 1:
""#include
using namespace std;

int main () {
cout << "Hello World" << endl;

return 0;

}""

Question for code 1 : Do I HAVE to use Namespace std? Do I HAVE to use endl?

Code 2:
hallo.cpp

""#include // ::std::cout #include // <<
int main(){ ::std::cout << "Hallo!" << '\n'; }""


Sorry for making this a long thread and a little confusing. But if you guys can answer my questions, that'd be great because it will clear up the confusion of which way is the best way to program.

Thanks!

[doctorgonzo]

\n is the escape code for a new line. endl is pretty much the same thing. Both simply hit "enter" after you output something. For example, if you did this:

cout<<"Hello world!";
cout<<"Goodbye world!";

the output would run together on one line like this (as with any programming, try it for yourself and see):

Hello world!Goodbye world!

Putting the \n or endl at the end simply adds a hard return, carriage return, whatever you want to call it:

cout<<"Hello world!"<<endl;
cout<<"Goodbye world!";

outputs what you probably intend:

Hello world!
Goodbye world!

As for the using namespace std;, you probably don't HAVE to include it. But it is proper for ANSI C++. If you want to get more information about what it does, go here

[Markoman01027]

Makes perfect sense DoctorGonzo. Thank you very much for your help!

[nocturnx]

Oh the Hello World code.....brings back memories.......sigh
Thats kinda funny, your school must be using the same book i used in college or do all books start off with the hello world code.....just wait till you get to the fun stuff, then its all worth it.

[james8547]

Yes Hello World

First thing I ever coded in any languge I studied (C++, Assembly, VB) was Hello World. I still have a copy of the program. Too bad some virus appended itself to it and I can't get it out. It's archived in a cd.

[Markoman01027]

I don't think we even use books in my high schoo.. She just hands us code and tells us to code it into our compiler. I pretty much teach myself in that class. Not sure if her methods of teaching are any useful for me.