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:
-
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.
- This hash contains the conversion factors for different distance units. Each key is a distance unit (e.g.,
-
method_missing
method:- When an unknown method is called on the
Distances
module, thismethod_missing
method is triggered. - It expects the method name to be in the format
"unit1_2unit2"
, whereunit1
andunit2
are distance units. - It splits the method name into two symbols (
from
andto
) using thesplit
method with the delimiter"_2"
. - It checks if both
from
andto
units are valid keys in theRATIOS
hash. If not, it raises aNoMethodError
. - 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 ofto
.
- When an unknown method is called on the
-
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, andnum
, which is the value to convert. - It iterates through the
RATIOS
hash, excluding thename
key, and prints the equivalent value ofnum
in each unit.
-
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 theRATIOS
hash.Distances.meter2centimeter(3)
: This line converts 3 meters to centimeters using themeter2centimeter
method.Distances.arshin2meter(1)
: This line converts 1 arshin to meters using thearshin2meter
method.Distances.versta2kilometer(20)
: This line converts 20 verstas to kilometers using theversta2kilometer
method.Distances.mile2piad(1)
: This line tries to convert 1 mile to piads using themile2piad
method, but it will raise aNoMethodError
becausemile
andpiad
are not included in theRATIOS
hash.
- The module is used in the code as follows:
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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