Temperature conversion

# title: Temperature conversion
# source: https://rosettacode.org/wiki/Temperature_conversion
# category: Rosetta Code
# difficulty: Intro
# summary: Convert fixed Celsius and Fahrenheit values with straightforward formulae.
# tags: popular, math, conversion, basics
# vibe: 0.2

def celsius_to_fahrenheit(value)
  (value * 9 / 5) + 32
end

def fahrenheit_to_celsius(value)
  (value - 32) * 5 / 9
end

def celsius_to_kelvin(value)
  value + 273.15
end

def run
  {
    freezing_point: {
      celsius: 0,
      fahrenheit: celsius_to_fahrenheit(0),
      kelvin: celsius_to_kelvin(0)
    },
    boiling_point: {
      celsius: 100,
      fahrenheit: celsius_to_fahrenheit(100),
      kelvin: celsius_to_kelvin(100)
    },
    room_temperature_fahrenheit: {
      fahrenheit: 68,
      celsius: fahrenheit_to_celsius(68)
    }
  }
end