Round50sen
50銭以下を切り捨て、50銭より多い場合は切り上げるround_50methodを、Integer/Float/BigDecimalに生やすgemです
厚生労働省：雇用保険の一般保険料額表の廃止と被保険者負担額の算定について
５０銭以下の場合は切り捨て、５０銭１厘以上の場合は切り上げとなります。
[1] pry(main)> 0.50.round_50sen
=> 0
[2] pry(main)> 0.51.round_50sen
=> 1
[3] pry(main)> 0.round_50sen
=> 0
[4] pry(main)> 1.round_50sen
=> 1
[6] pry(main)> BigDecimal('0.50000000000000000000000000000000000000').round_50sen.to_f
=> 0.0
[7] pry(main)> BigDecimal('0.50000000000000000000000000000000000001').round_50sen.to_f
=> 1.0
[8] pry(main)> BigDecimal('0.5550000000000000000000000000000000000000').round_50sen(2).to_f
=> 0.55
[9] pry(main)> BigDecimal('0.5550000000000000000000000000000000000001').round_50sen(2).to_f
=> 0.56
[10] pry(main)> BigDecimal('15000.00000000000000000000000000000000000000').round_50sen(-4).to_f
=> 10000.0
[11] pry(main)> BigDecimal('15000.00000000000000000000000000000000000001').round_50sen(-4).to_f
=> 20000.0Installation
Add this line to your application's Gemfile:
gem 'round_50sen'And then execute:
$ bundle
Or install it yourself as:
$ gem install round_50sen
Usage
TODO: Write usage instructions here
Contributing
- Fork it ( https://github.com/[my-github-username]/round_50sen/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request