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Hello World in C++ - a first program, with the process explained

"Hello World" programs - traditionally (a good tradition) te first example on a proogramming course in any language - just output the words "Hello World" or similar text and do little else. They show learners / students / delegates the mechanism of working with a language in te simplest possible example - how to enter the code, how to turn the code into something that can be run, and how to actually run it.

Here's a "hello world" program in C++ - this text being entered into a file with an extenstion ".c++" or ".cpp" using your "favourite text editor". Use gedit, use notepad or notepad++, use emacs, nano or vi. (This text is know as the souce code)

  #include <iostream>
  using namespace std;
  int main() {
     cout << "Welcome - and enjoy your C++ course" << endl;
  }


In C++, having entered the file of text you need to convert it into an "executable program" - a file of instructions for that the processor of your computer understands rather than the English-like (!) language of C++. This process is known as "compiling" and on Unix / inux / OSX systems the easiest way is often the "make" utility:

  WomanWithCat:harwell grahamellis$ make hw
  c++ hw.cpp -o hw
  WomanWithCat:harwell grahamellis$


The resultant file - called hw in our example - can then be run as follows:

  WomanWithCat:harwell grahamellis$ ./hw
  Welcome - and enjoy your C++ course
  WomanWithCat:harwell grahamellis$


An exercise such as this may appear trivial, but it lets delegates who are using our systems (or who are new to the tools on thei own systems) get a first bite at using the elements and pasting them together - and those who are used to scripting or pseudo-scripting languages to come to terms with the need for an extra compile stage for C or C++.

Source code at [here].
(written 2015-10-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C231 - C and C based languages - Introduction to C++
  [4562] Left shift operator on an output stream object - C++ - (2015-10-30)
  [4466] Moving from C to C++ - Structured to Object Oriented - a lesson for engineers - (2015-03-28)
  [3250] C++ - how we teach the language and the concepts behind the language - (2011-04-17)
  [3069] Strings, Garbage Collection and Variable Scope in C++ - (2010-11-25)
  [3053] Make - automating the commands for building and installing - (2010-11-16)
  [3052] Getting your C++ program to run - (2010-11-15)
  [2845] Objects and Inheritance in C++ - an easy start - (2010-07-01)
  [2169] When should I use OO techniques? - (2009-05-11)
  [2004] Variable Scope in C++ - (2009-01-22)
  [928] C++ and Perl - why did they do it THAT way? - (2006-11-16)
  [336] Targetted Advertising - (2005-06-05)
  [318] Choosing a theme - (2005-05-20)
  [317] Programming languages - a comparison - (2005-05-20)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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