Merge pull request #127 from msaf9/master

[math] add and median

maths/add.rb

@@ -0,0 +1,34 @@
+# A ruby program to add numbers
+# Addition or sum of numbers means adding each and every element of the inputs
+# Sum or addition of 1 and 3 is 1 + 3 = 4
+
+def add(*array)
+  sum = 0
+  array.each { |a| sum+=a }
+  puts "The sum of following elements #{array} is #{sum}"
+  rescue
+    puts "Error: Please provide number only!"
+end
+
+# 
+# Valid inputs
+# 
+
+puts add(1)
+# The sum of following elements [1] is 1
+
+puts add(2, 5, -4)
+# The sum of following elements [2, 5, -4] is 3
+
+puts add(25, 45)
+# The sum of following elements [25, 45] is 70
+
+# 
+# Invalid inputs
+# 
+
+puts add("1", 2, 3)
+# Error: Please provide number only!
+
+puts add("a", 1)
+# Error: Please provide number only!

maths/average_median.rb

@@ -0,0 +1,60 @@
+# A ruby program to find average median
+# Reference: https://dev.to/colerau/how-to-find-the-median-and-mean-of-an-array-in-ruby-4f04
+
+module AverageMedian
+  def self.average_median(n, *array)
+    if n.instance_of? Integer
+      if n == array.size
+        array.sort
+        if array.size % 2 == 0
+          mid_element_1 = array.size/2
+          mid_element_2 = mid_element_1 + 1
+          puts "The average median of the following elements #{array} is #{(array[mid_element_1 - 1] + array[mid_element_2 - 1]) / 2}."
+        else
+          mid_element = (array.size + 1) / 2
+          puts "The average median of the following elements #{array} is #{array[mid_element - 1]}."
+        end
+      else
+        puts "Provide the required #{n} elements properly!"
+      end
+    else
+      raise
+    end
+    rescue
+      puts "Error: Please provide number only!"
+  end
+end
+
+# 
+# Valid inputs
+# 
+
+puts AverageMedian.average_median(2, 3, 1)
+# The average median of the following elements [3, 1] is 2.
+
+puts AverageMedian.average_median(5, 1, 2, 3, 4, 5)
+# The average median of the following elements [1, 2, 3, 4, 5] is 3.
+
+puts AverageMedian.average_median(3, 2, 2, 2)
+# The average median of the following elements [2, 2, 2] is 2.
+
+puts AverageMedian.average_median(1, 5)
+# The average median of the following elements [5] is 5.
+
+# 
+# Invalid inputs
+# 
+
+puts AverageMedian.average_median(2, 3, 1, 5)
+# Provide the required 2 elements properly!
+
+puts AverageMedian.average_median(2, 3, "a")
+# Traceback (most recent call last):
+#         4: from /Users/voliveira/.rvm/rubies/ruby-2.7.0/bin/irb:23:in `<main>'
+#         3: from /Users/voliveira/.rvm/rubies/ruby-2.7.0/bin/irb:23:in `load'
+#         2: from /Users/voliveira/.rvm/rubies/ruby-2.7.0/lib/ruby/gems/2.7.0/gems/irb-1.2.1/exe/irb:11:in `<top (required)>'
+#         1: from (irb):30
+# NameError (undefined local variable or method `verageMedian' for main:Object)
+
+puts AverageMedian.average_median("a", 1, 2)
+# Error: Please provide number only!