For 2023 (and 2024 ...) - we are now fully retired from IT training. We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
The same very simple program in many different programming languages
I was asked how many languages I teach yesterday - and the answer's quite a few; at times, it's almost "the more the merrier" as to a very great extent they are varieties on a theme much of the way - but different balances of features make some languages especially good for some uses.
As a geek's relaxation after some very heavy days, I have just taken a very simple example - a loop counting downwards - from yesterday's Lua course, and recoded it into a number of different languages - I'll share the code here:
In C
#include <stdio.h>
main() {
int k;
for (k=10; k>=1; k--) {
printf("%d\n",k);
}
}
C Courses - Source of this example
In C++
using namespace std;
#include <iostream>
main() {
int k;
for (k=10; k>=1; k--) {
cout << k << endl;
}
}
C++ Courses - Source of this example
In Java
public class revl {
public static void main(String [] args) {
int k;
for (k=10; k>=1; k--) {
System.out.println(k);
}
}
Java Courses - Source of this example
}
In Lua
for k=10,1,-1 do
print (k)
end
Lua Courses - Source of this example
In PHP
<?php
for ($k=10; $k>=1; $k--) {
print ("$k\n");
}
?>
PHP Courses - Source of this example
In Perl
for ($k=10; $k>=1; $k--) {
print ("$k\n");
}
Perl Courses - Source of this example
In Python
for k in range(10,0,-1):
print k
Python Courses - Source of this example
In Ruby
for k in 1..10
print ("#{11-k}\n")
end
Ruby Courses - Source of this example
In Shell (works in ksh and bash)
let a=10
while [[ $a -ge 1 ]] ; do
echo $a
let a-=1
done
Linux / Unix / Shell Courses - Source of this example
and in Tcl
set k 10
while {$k >= 1} {
puts $k
incr k -1
}
Tcl, Tk, Expect Courses - Source of this example
In Summary ... there are many ways of doing something like this in all of the languages - the examples above are not necessarily best practise, but they give you an idea of programs, loops, variables, and how they compare. I could have added Javascript, XSLT, Fortran, C Shell, Basic and perhaps a few others - but the above are just the languages I happened to have on the machine I was using - one of our teaching machines - and I could test them quickly. Did someone mention awk ...
(written 2010-03-31, updated 2010-04-01)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles Q102 - Choosing your language [76] Learning to program in - (2004-10-07) [1990] Speaking all the languages - (2009-01-12) [2001] I have not programmed before, and need to learn - (2009-01-19) [2048] Learning to program in PHP, Python, Java or Lua ... - (2009-02-19) [2507] Admission - (2009-11-19) [2535] When should I use Java, Perl, PHP, or Python? - (2009-12-13) [2536] All the Cs ... and Java too - (2009-12-13) [2866] Ruby - how does it compare and where is it the right language? - (2010-07-11) [3169] Rekeying a table - comparison in #Ruby #Perl and #Python - (2011-02-14) [3558] Python or Lua - which should I use / learn? - (2011-12-21) [3619] Ruby v Perl - a comparison example - (2012-02-21) [3764] Shell, Awk, Perl of Python? - (2012-06-14) [3785] Programming languages - what are the differences between them? - (2012-06-27)
G908 - Well House Consultants - Language Comparisons [209] FAQ - Perl or PHP - (2005-02-11) [1582] Ruby, C, Java and more - getting out of loops - (2008-03-19) [1717] Q - Should I use Perl or Python? - (2008-07-23) [2755] Books in the store in the USA - still a portent of the UK market to come? - (2010-05-08) [2947] Teaching Lua to a Perl advocate - (2010-09-06) [3003] What will we be teaching in six years? - (2010-10-17) [3112] Public and private courses - subjects available for 2011 - (2010-12-29)
Some other Articles
A walk within without - Melksham Without Lua Metatables First and last match with Regular Expressions Is Lua an Object Oriented language? The same very simple program in many different programming languages Lua tables - they are everything Ruth Davis, 1916 - 2010 Email metrics and filtering Garlic bread without garlic TCP v UDP / Client v Server - Python examples
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