A simple Prime number generator using the Sieve of Eratosthenes. Used as an coding example on how to generator Prime numbers without using the Prime class provided by Ruby.
The generate_primes method accepts two parameters that are used to generate the
requested number of prime values.
| Name | Description | Required? | Default Value |
|---|---|---|---|
| count | The number of Prime numbers to be generated by the method. Must be greater than or equal to 1. | YES | |
| seed | The seed value, or the lower bound of values returned by the method. Not required to be a prime number. | No | 2 |
The print_multiplication_table method accepts two parameters that are used to generate the
multiplication table for the specified number of prime numbers.
| Name | Description | Required? | Default Value |
|---|---|---|---|
| num_of_values | The number of Prime numbers to be generated by the method. Must be greater than or equal to 1. | YES | |
| seed | The seed value, or the lower bound of values returned by the method. Not required to be a prime number. | No | 2 |
To output a multiplication table from the command line, the following command can be executed from the project's root.
ruby print_multiplication_table.rb 10+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| Multiplication Table for 10 Primes (2 through 29). |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
| | 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 |
+----+----+----+-----+-----+-----+-----+-----+-----+-----+-----+
Test coverage is provided using Rspec. To run the test suite, the following command should be executed from the project's root.
rspec spec/*_spec.rb..............
Finished in 0.0084 seconds
14 examples, 0 failuresPrimes requires the following gems to be available:
Code and documentation copyright 2015 Michael De Lorenzo. Code released under the MIT license.