28 Ott 2002
Costruzione di Interfacce - Paolo Cignoni
6
Hello World
[Hello.java]
package hello;      // says that we are part of a package named hello

public class Hello  // declare a class called Hello
{
    public static void main(String args[])  // declare the function main
                                            // that takes an array of Strings
    {
        System.out.println("Hello world!"); // call the static method
                                            // println on the class System.out
                                            // with the parameter "Hello world!"
    }
}

[Hello.C]
#include <iostream>  // include declarations for the "cout" output stream

using namespace std;    // the cout stream is in the std namespace
                        // this tells the compiler to look in the std
                        // namespace, you can also write std::cout

int main(int argc, char *argv[])  // declare the function main that
                                  // takes an int and an array of strings
                                  // and returns an int as the exit code
{
    cout << "Hello world!" << endl; // this inserts "Hello world!"
                    // and an newline character into the cout
// output stream
}