Simple Letter Combinations Program

[BlueShift]

Hi,everyone i am new here,and i know very little about programming,and that is why i need your help.
I need "Letter Combinations Program":for example we have 12 letters,and we need to make as manu as possible 5 letter words(each letter is used only once),and words can be meaningfull and unmeaningfull,which means that i need all combinations.How many combinations are there in this example an can some program be made in which these 12 letters are typed in and then the program list all possible 5 letter words(without repeating the same letter twice)?

[Stephen Bryant]

What language do you have to do this in? This sounds like a homework problem to me, and while we won't do it for you, we'll be glad to help.

[BlueShift]

It doesn't matter in which language it is done,i need this program for work belive it or not,i don't know anything about programming,so can you help me about this?:|

[Stephen Bryant]

Ok, this code will do it. It's written in PHP, you can view the result here: http://home.stephenbryant.net/nums.php

 <?php
$x = array('a','b','c','d','e');
 
foreach ($x as $a) {
    foreach ($x as $b) {
        foreach ($x as $c) {
            foreach ($x as $d) {
                foreach ($x as $e) {
                    echo $a.$b.$c.$d.$e.'<br>';
                }
            }
        }
    }
}
?>  

[BlueShift]

Kyle,thank you very much for your response,this is very important for me,but this is not the solution i need.I don't need permutations.Twelve letters are given:a,b,c,d,e,f,g,h,i,j,k,f ,and i need all 5 letter words that can be made from these 12 letters,but each letter is used only once.DO have in mind that for the work in witch i need this program will always gave me diffrent letters(for example:q,r,y,h,f,b,c,z,j,a,o,j).Words can be meaningfull and unmeaningfull,which means that i need all combinations.

Can you calculate for me how many possible words are there in this problem.

Example: a,b,c,d,e,f,g,h,i,j,k,f

abcde
abcdf
abcdg...

...fhijk

[Stephen Bryant]

Ok, this code will do that, example is in same place.

 <?php
$x = array('a','b','c','d','e','f','g','h','i','j','k','l');
 
foreach ($x as $a) {
    foreach ($x as $b) {
        foreach ($x as $c) {
            foreach ($x as $d) {
                foreach ($x as $e) {
                    $res[] = array($a,$b,$c,$d,$e);
                }
            }
        }
    }
}
$i = 0;
foreach ($res as $arr) {
    $arr = array_unique($arr);
    if (count($arr) == 5) {
        echo $arr[0].$arr[1].$arr[2].$arr[3].$arr[4].'<br>';
        $i++;
    }
}
echo $i;
?>  

The total is at the bottom.

[BlueShift]

Yes this is what i am looking for,thank you,but this is only an example.I want to change the letters so i can use it again and again.In which program do i run this php code so i can get the list of words.I presume that the only thing that i need to change is "$x = array('a','b','c','d','e','f','g','h','i','j','k','l');-instead of these letters i should type in other letters,ore there is more things that need to be changed.




"

[hot_cakes]

Do you need a list of words, or the number of words that exist? If you only need the number, you don't need a computer program to work it out. That mathematics is relatively simple.

And do these words have to be real (i.e. appear in a dictionary?)

Edd

[BlueShift]

I need a list of words,and these words doesnt have to be real.All i want is simple program where i type in 12 different letters and it list me all 5 letter words.

[hot_cakes]

What if a letter is duplicated? Do you want repeats in this case?