Erle Robotics C++ GitBook

Hello World

In the tradition of programmers everywhere, we’ll use a “Hello, world!” program as an entry point into the basic features of C++.

#include <iostream>

int main () {
    std :: cout << " Hello , world !\n ";
    return 0;

There is also another possibilities, like this one:

#include <stdio.h>

int main(){
    printf("Hola Mundo! \n ");
    return 0;

Take into account the following:

  • A statement is a unit of code that does something – a basic building block of a program.
  • An expression is a statement that has a value – for instance, a number, a string, the sum of two numbers, etc. 4 + 2, x - 1, and "Hello, world!\n" are all expressions. Not every statement is an expression. It makes no sense to talk about the value of an #include statement, for instance.