Merge pull request #131 from msaf9/master

PR for find max feature

DIRECTORY.md

@@ -79,6 +79,7 @@
   * [Decimal To Binary](https://github.com/TheAlgorithms/Ruby/blob/master/maths/decimal_to_binary.rb)
   * [Factorial](https://github.com/TheAlgorithms/Ruby/blob/master/maths/factorial.rb)
   * [Fibonacci](https://github.com/TheAlgorithms/Ruby/blob/master/maths/fibonacci.rb)
+  * [Find Max](https://github.com/TheAlgorithms/Ruby/blob/master/maths/find_max.rb)
   * [Number Of Digits](https://github.com/TheAlgorithms/Ruby/blob/master/maths/number_of_digits.rb)
   * [Power Of Two](https://github.com/TheAlgorithms/Ruby/blob/master/maths/power_of_two.rb)
   * [Prime Number](https://github.com/TheAlgorithms/Ruby/blob/master/maths/prime_number.rb)

maths/find_max.rb

@@ -0,0 +1,64 @@
+# A ruby program to find max from a set of elements
+
+# This find_max method will return the max element out of the array
+def find_max(*array)
+  max = array[0]
+  array.each do |a|
+    if a >= max
+      max = a
+    end
+  end
+    "The Max of the following elements #{array} is #{max}."
+  rescue
+    "Error: Please provide number only!"
+end
+
+# Max method will return the maximum element from the set of input elements provided
+def predefined_max(*array)
+  "The Max of the following elements #{array} is #{array.max}."
+  rescue
+    "Error: Please provide number only!"
+end
+
+# Sort method will sort the elements in ascending order. Last method will return the end element out of the array
+def predefined_sort_last_max(*array)
+  "The Max of the following elements #{array} is #{array.sort.last}."
+  rescue
+    "Error: Please provide number only!"
+end
+
+# Using find_max
+# Valid inputs
+puts find_max(11, 29, 33)
+# The Max of the following elements [11, 29, 33] is 33.
+
+puts find_max(-221, -852, -1100, -10)
+# The Max of the following elements [-221, -852, -1100, -10] is -10.
+
+# Invalid inputs
+puts find_max(5, "95", 2)
+# Error: Please provide number only!
+
+# Using predefined_max
+# Valid inputs
+puts predefined_max(51, 82, 39)
+# The Max of the following elements [51, 82, 39] is 82.
+
+puts predefined_max(-11, -51, -10, -10)
+# The Max of the following elements [-11, -51, -10, -10] is -10.
+
+# Invalid inputs
+puts predefined_max("x", 5, 95, 2)
+# Error: Please provide number only!
+
+# Using predefined_sort_last_max
+# Valid inputs
+puts predefined_sort_last_max(1, 2, 3)
+# The Max of the following elements [1, 2, 3] is 3.
+
+puts predefined_sort_last_max(-21, -52, -100, -1)
+# The Max of the following elements [-21, -52, -100, -1] is -1.
+
+# Invalid inputs
+puts predefined_sort_last_max(5, 95, 2, "a")
+# Error: Please provide number only!