How to resolve the algorithm Old Russian measure of length step by step in the Ruby programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Old Russian measure of length step by step in the Ruby programming language

Table of Contents

Problem Statement

Write a program to perform a conversion of the old Russian measures of length to the metric system   (and vice versa).

It is an example of a linear transformation of several variables.

The program should accept a single value in a selected unit of measurement, and convert and return it to the other units: vershoks, arshins, sazhens, versts, meters, centimeters and kilometers.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Old Russian measure of length step by step in the Ruby programming language

The code is a Ruby module named Distances that provides conversion methods for various units of distance. It defines a hash called RATIOS that maps distance units to their respective conversion factors in meters.

Here's a detailed breakdown of the code:

  1. RATIOS hash:

    • This hash contains the conversion factors for different distance units. Each key is a distance unit (e.g., :meter, :centimeter), and the corresponding value is the conversion factor to convert that unit to meters.
  2. method_missing method:

    • When an unknown method is called on the Distances module, this method_missing method is triggered.
    • It expects the method name to be in the format "unit1_2unit2", where unit1 and unit2 are distance units.
    • It splits the method name into two symbols (from and to) using the split method with the delimiter "_2".
    • It checks if both from and to units are valid keys in the RATIOS hash. If not, it raises a NoMethodError.
    • If the units are valid, it performs the conversion by multiplying the input value (arg) by the conversion factor of from and dividing by the conversion factor of to.
  3. print_others method:

    • This method is used to print the equivalent values of a given distance in other units.
    • It takes two arguments: name, which is the name of the unit to convert from, and num, which is the value to convert.
    • It iterates through the RATIOS hash, excluding the name key, and prints the equivalent value of num in each unit.
  4. Usage of the module:

    • The module is used in the code as follows:
      • Distances.print_others("meter", 2): This line prints the equivalent of 2 meters in all other distance units defined in the RATIOS hash.
      • Distances.meter2centimeter(3): This line converts 3 meters to centimeters using the meter2centimeter method.
      • Distances.arshin2meter(1): This line converts 1 arshin to meters using the arshin2meter method.
      • Distances.versta2kilometer(20): This line converts 20 verstas to kilometers using the versta2kilometer method.
      • Distances.mile2piad(1): This line tries to convert 1 mile to piads using the mile2piad method, but it will raise a NoMethodError because mile and piad are not included in the RATIOS hash.

Source code in the ruby programming language

module Distances

  RATIOS = 
  {arshin: 0.7112, centimeter: 0.01,     diuym:   0.0254,
   fut:    0.3048, kilometer:  1000.0,   liniya:  0.00254,
   meter:  1.0,    milia:      7467.6,   piad:    0.1778,
   sazhen: 2.1336, tochka:     0.000254, vershok: 0.04445,
   versta: 1066.8}

  def self.method_missing(meth, arg)
    from, to = meth.to_s.split("2").map(&:to_sym)
    raise NoMethodError, meth if ([from,to]-RATIOS.keys).size > 0
    RATIOS[from] * arg / RATIOS[to]
  end

  def self.print_others(name, num)
    puts "#{num} #{name} ="
    RATIOS.except(name.to_sym).each {|k,v| puts "#{ (1.0 / v*num)} #{k}" }
  end
end

Distances.print_others("meter", 2)
puts
p Distances.meter2centimeter(3)
p Distances.arshin2meter(1)
p Distances.versta2kilometer(20) # en Hoeperdepoep zat op de stoep
# 13*13 = 169 methods supported, but not:
p Distances.mile2piad(1)


  

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