Prime Multiplication Table
A command-line tool that prints a multiplication table of the first N prime numbers.
Installation
There are two ways to install Prime Multiplication Table, either straight from RubyGems or from the repository.
Installing from RubyGems
gem install pmt
Installing from repository
Clone the repository:
git clone https://github.com/SebastianCoetzee/pmt.git
Change into the directory:
cd pmt
Build the gem:
gem build pmt.gemspec
Install the gem (replace x with the version number of the gem):
gem install pmt-x.x.x.gem
Usage
Run the tool with the following command, which prints a multiplication table of the first 10 prime numbers:
pmt
Output:
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 2 | 4 | 6 | 10 | 14 | 22 | 26 | 34 | 38 | 46 | 58 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 3 | 6 | 9 | 15 | 21 | 33 | 39 | 51 | 57 | 69 | 87 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 5 | 10 | 15 | 25 | 35 | 55 | 65 | 85 | 95 | 115 | 145 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 7 | 14 | 21 | 35 | 49 | 77 | 91 | 119 | 133 | 161 | 203 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 11 | 22 | 33 | 55 | 77 | 121 | 143 | 187 | 209 | 253 | 319 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 13 | 26 | 39 | 65 | 91 | 143 | 169 | 221 | 247 | 299 | 377 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 17 | 34 | 51 | 85 | 119 | 187 | 221 | 289 | 323 | 391 | 493 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 19 | 38 | 57 | 95 | 133 | 209 | 247 | 323 | 361 | 437 | 551 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 23 | 46 | 69 | 115 | 161 | 253 | 299 | 391 | 437 | 529 | 667 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| 29 | 58 | 87 | 145 | 203 | 319 | 377 | 493 | 551 | 667 | 841 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
You can specify the number of prime numbers:
pmt --count 5
Output:
+----+----+----+----+----+-----+
| | 2 | 3 | 5 | 7 | 11 |
+----+----+----+----+----+-----+
| 2 | 4 | 6 | 10 | 14 | 22 |
+----+----+----+----+----+-----+
| 3 | 6 | 9 | 15 | 21 | 33 |
+----+----+----+----+----+-----+
| 5 | 10 | 15 | 25 | 35 | 55 |
+----+----+----+----+----+-----+
| 7 | 14 | 21 | 35 | 49 | 77 |
+----+----+----+----+----+-----+
| 11 | 22 | 33 | 55 | 77 | 121 |
+----+----+----+----+----+-----+
To see an explanation of the command line interface, use the help function:
pmt --help
Testing
After cloning the repository as explained above, from the root of the repository, run the following:
gem install bundler
Then install the dependencies:
bundle install
After the dependencies are installed, run the following command to run the test suite:
rspec
External Dependencies
- commander for parsing command line arguments
- terminal-table for formatting the table to STDOUT
License
MIT