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Number and Password Problems

Number and Password Problems

The following are my responses to a series of simple PHP problems (attached in the Word File).  I needed to review Doyle (2010) chapters 9 and 10 which cover form submission and session variables in order to complete these exercises.  I also leaned on chapter 18 which goes into depth on regular expressions to assist with pattern recognition.

Download the sourcecode

Execute each of these programs via the links provided below:

Integers

This program reads a non integer range (between 0 and 20) and prints the powers of 2 from 1 to 2N.  This exercise was the easiest of the assigned tasks to complete.

Execute the program

Scorekeepers

This program take a list of team names, and print them vertically.

Execute the program

Factorials

This program reads input values, n and m, and output the number of different combinations of m things that can be formed from a group containing n members.  I had a difficult time coming up with the actual factorial calculation and upon further research I was able to use a snippet of code from http://php.net/manual/en/ref.math.php to help me solve this problem.

Execute the program

Password Strength

This program prompts for a password and returns its strength based on length, symbol / numeric use and upper and lowercase letters.

Execute the program

Number Spiral

This program prompts for the size of a number spiral (which must be an odd number between 1 and 19).  It then outputs to the screen the number spiral, with the numbers aligned vertically with the least significant digits.

Out of all the exercises I had the most trouble trying to figure out a way to accomplish this correctly.  In the end I could not solve this exercise.  Instead, I borrowed code from a previous solution posted here: http://stackoverflow.com/questions/6632645/php-spiral-with-numbers-0-to-9.  I modified the code to improve on the formatting and also to allow for user input of the size of the spiral.

Execute the program

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About The Author

Ian Carnaghan

I am a software developer and online educator who likes to keep up with all the latest in technology. I also manage cloud infrastructure, continuous monitoring, DevOps processes, security, and continuous integration and deployment. In my spare time I teach undergraduate classes in web development.