If you have some experience in programming, you have probably seen this quote uncountable times. The Hello, world! start is always a good start. With such a simple meaning, it can make you learn a lot of useful things about the language you want to learn. We will take C++ as an example. This is the code that makes that beautiful and simple quote to appear on your screen: #include <iostream> using namespace std; int main() { cout<<"Hello, world!"<<endl; return 0; } First of all, you will notice the #include <iostream> . From now on, you have to remember to include that library when you want to use the stdout or stdin . Then, we have using namespace std; . Although this line can be omitted, it is way better to include it in our program. Otherwise, we would have to add std:: before every single token calling a function inside the Standard Library, so the fifth line would be: std::cout<<"Hello, world!"<<std::endl; And ...