Showing posts with label php. Show all posts
Showing posts with label php. Show all posts

18 March 2012

CodeEval FizzBuzz

CodeEval is a site where programmers can compete for jobs or in my case hopefully learn something more. I have small experience in Java and Visual Basic. I have slightly more experience in HTML, JavaScript and PHP. So I use this site for practise.
The 1st problem they put on there is FizzBuzz, the problem is below:

Description

Players generally sit in a circle. The player designated to go first says the number "1", and each player thenceforth counts one number in turn. However, any number divisible by 'A' e.g. three is replaced by the word fizz and any divisible by 'B' e.g. five by the word buzz. Numbers divisible by both become fizz buzz. A player who hesitates or makes a mistake is either eliminated.

Write a program that prints out the the pattern generated by such a scenario given the values of 'A'/'B' and 'N' which are read from an input text file. The input text file contains three space delimited numbers i.e. A, B, N. The program should then print out the final series of numbers using 'F' for fizz, 'B' for 'buzz' and 'FB' for fizz buzz.

Input sample:

Your program should read an input file (provided on the command line) which contains multiple newline separated lines. Each line will contain 3 numbers which are space delimited. The first number is first number to divide by ('A' in this example), the second number is the second number to divide by ('B' in this example) and the third number is where you should count till ('N' in this example). You may assume that the input file is formatted correctly and is the numbers are valid positive integers.e.g.

3 5 10
2 7 15

Output sample:

Print out the series 1 through N replacing numbers divisible by 'A' by F, numbers divisible by 'B' by B and numbers divisible by both as 'FB'. Since the input file contains multiple sets of values, your output will print out one line per set. Ensure that there are no trailing empty spaces on each line you print.e.g.

1 2 F 4 B F 7 8 F B
1 F 3 F 5 F B F 9 F 11 F 13 FB 15

Unfortunately when I did the Java solution I couldn't do it, so I searched for the solution online. DO NOT CLICK LOOK UNLESS YOU HAVE TRIED IT FIRST
/*Sample code to read in test cases:
public class fizzbuzz {
    public static void main (String[] args) {
    ...
    File file = new File(args[0]);
    BufferedReader in = new BufferedReader(new FileReader(file));
    String line;
    while ((line = in.readLine()) != null) {
        String[] lineArray = line.split("\s");
        if (lineArray.length > 0) {
            //Process line of input Here
        }
    }
  }
}
*/
import java.io.*;

import java.util.*;

public class fizzbuzz {

    public static void main(String[] args) throws IOException{

        Scanner console = new Scanner(new FileReader(args[0]));
        while(console.hasNext()){
            int first=console.nextInt();
            int second =console.nextInt();
            int third =console.nextInt();

            for(int i=1;i<=third;i++){
                if(i%first==0 && i%second==0 ){
                    System.out.printf("FB ");
                }
                else if(i%first==0)
                    System.out.printf("F ");
                else if(i%second==0)
                    System.out.printf("B " );
                else
                    System.out.printf("%d ",i);
            }
            System.out.println();
        }
        console.close();
    }
}
The last bit of the code I can do, it's just I couldn't read a file.
I also decided to see if I could do it in PHP as well
<?php
 /*Sample code to read in test cases:
 $fh = fopen($argv[1], "r");
 while (true) {
 $test = fgets($fh);
 # break loop if $test is an empty line
 # $test represents the test case, do something with it
 }
 */
    $file_get_contents=fopen($argv[1],"r");
     while ( ($line = fgets($file_get_contents)) !== false) {
     $k=0;
           foreach(preg_split("/[\s]/", $line) as $space){
              if($k==0){
                  $f=$space;
               }
                if($k==1){
                  $b=$space;
                }
               if($k==2){
                   $n=$space;
                }
                $k=$k+1;
            }
           for($i=1;$i<=$n;$i++){
                if(($i % $f==0)&&($i % $b==0)){
                 echo "FB ";
                }
                elseif($i % $f==0){
              echo "F ";
             }
                elseif($i % $b==0){
                 echo "B ";
                }
                else{
                 echo $i." ";
                }
            }
            echo "\n";
        }
 ?>
Good tip they do provide comments to help you through it, which is rather handy. Anyway I also tried to do it in JavaScript:
/*Sample code to read in test cases:
function codeEvalExecute(line) 
{ //your code goes here. line is your test case 
//return 
}*/
function codeEvalExecute(line){
 //an array with 3 values
 var Byline=line.split(" ");
 //fizz
 var f=Byline[0];
 //buzz
 var b=Byline[1];
 //number run to
 var n=Byline[2];
 var string="";
 
 for(var i=1;i<=n;i++){
  if((i % f==0)&&(i % b==0)){
          string=string+"FB ";
        }
        else if(i % f==0){
           string=string+"F ";
       }
        else if(i % b==0){
            string=string+"B ";
        }
        else{
           string=string+i+" ";
       }
 }
 return string;
}
Update 18/03/2012 11.59am
I should point out if you want to learn JavaScript or PHP I suggest w3 school as for Java I don't know any sites so put some in the comments if you have a suggestion

7 September 2011

php open, write and download a file

I have spend today and yesterday trying to make html write into a file and then download that file. The first objective was to open a file.

<?php
$filename="LinkTestText.txt";
$file=fopen($filename,'w+');
?>

Seems straight forward but i got an error

fopen(LinkTestText.txt) [function.fopen]: failed to open stream: Permission denied.

Okay okay calm down all I have to do is change permission of the file. <long time doing a google search> (many frustrating clicking and shouting at the computer (glad it doesn't have emotions)). On all <exaggeration> the forums no one mentioned a php function called "chmod"!!! Why this is what i'm looking for, okay so lets code it.

<?php
$filename="LinkTestText.txt";
chmod($filename, 0777);
$file=fopen($filename,'w+');
?>

Error appears:

chmod(): Operation not permitted in /file/path/to/that/ruddy/file.php

Rubbish, lets look on php.net to see if they have an answer <Quick look> ooh they have an answer. What one person says is use File Transfer Protocol (ftp) to change the permission, Huzzah an answer finally.

<?php
$filename="LinkTestText.txt";
$row['username']="Joe Bloggs";
$row['password']="passw0rd";
$ftp_details['ftp_user_name'] = $row['username'];
$ftp_details['ftp_user_pass'] = $row['password'];
$ftp_details['ftp_root'] = '/file/path/to/that/ruddy/';
//website address
$ftp_details['ftp_server'] = '10.0.1.200';
function chmod_11oo10($path, $mod, $ftp_details){
// extract ftp details (array keys as variable names)
extract ($ftp_details);
// set up basic connection
$conn_id = ftp_connect($ftp_server);
// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
// try to chmod $path directory
if (ftp_site($conn_id, 'CHMOD '.$mod.' '.$ftp_root.$path) !== false){
$success=TRUE;
}
else {
$success=FALSE;
}
// close the connection
ftp_close($conn_id);
return $success;
}
chmod_11oo10($filename, "0777", $ftp_details);
$file=fopen($filename,'w+');
fwrite($file,"Writing a lovely string to a file");
fclose($file);
$file=fopen($filename,'w+');
?>

Good so all we need to do now is activate ftp and then work out a way to force a download. Here is a link i found earlier

<?php
//http://php.net/manual/en/function.readfile.php
header('Content-Description: File Transfer');
header('Content-Type: application/download');
//it will be called
header('Content-Disposition: attachment; filename="Link test test.txt"');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($filename));
ob_clean();
flush();
readfile($filename);
exit;
?>

Done. One last thing the whole of it HAS to appear before "any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.". The only thing that is missing is why i put 0777 as the permission, to be honest i have no idea, just saw the number keep on popping up on a couple of forums.

1 August 2011

MSc Project website

I did originally set the website up as being just one big huge html file. It became too big especially when i started doing Material Properties Module (at the moment Material Properties Modules is still very big and is a bit slow on loading). This also meant it was slow as well. Now being a student (still) I get to have some free webspace and hosting, I know amazing. So all my pages i've done so far are up on the website. Just to let you know don't click on any links between and including 'General Equation Module' and 'User Module' you will get a error message saying page not found. Any suggestion to improve the site please leave a comment.

25 July 2011

html page advance php

I just found out when I did Material Properties module that the code was around 109,000 lines so it was being sluggish, so the idea was to store information on the server, from w3 school and there were two ways of doing server bits. ASP wasn't recommended as it was oldish and also pc only, so i had a look at PHP. It stands for PHP: Hypertext Preprocessor, I hate self referencing, such a pain.

PHP is the code which gets processed by Apache on the server and MySQL I think is where you store whatever you want.

According to a couple of websites on snow leopard, you don't need to install php it's already on there, you just need to do a couple of tweaks.

A couple of things the websites forgot to mention was to view the PHP you don't view it as a file in the internet browser e.g. file:///Users/james_p_clare/Sites/MScWebsite/linktest.html you have to view it on Localhost so it will look something like this http://localhost/~james_p_clare/MScWebsite/PhysicaModule.php. Also to view PHP file have to have the extension .php otherwise it won't work. I spent two days not knowing the last two facts. Ahhhhhh.

If your not a mac user w3 schools does direct you to a website which lists other OS. Although a google search maybe better. good luck