Week 2 Gautam_S

week_2/pet.rb

@@ -46,7 +46,15 @@ def initialize(name: , animal_type_id: , food_consumed_per_day:)
 
   # Return the habitat of the pet
   def habitat
-    raise NotImplementedError # TODO
+
+    HABITATS.each do |key, value|
+
+  #      print "Animal id #{@animal_type_id} key is #{key} value is #{value}"
+
+        if (value.include?(@animal_type_id)) then
+          return key
+        end
+    end
   end
 
   # Returns the cost of food required to feed the animal 
@@ -66,17 +74,16 @@ def food_cost_per_day
   # cat = Pet.new(name: 'cat', animal_type_id: 6, food_consumed_per_day: 0.4)
   # cat.food_required(28) = 11.2 (0.4 * 28)
   def food_required(days)
-    raise NotImplementedError # TODO
+    return @food_consumed_per_day * days
   end
-
   # This function takes the number of `days` as the input
   # and returns the cost incurred to feed the pet for
   # that many number of days
   #
   # cat = Pet.new(name: 'cat', animal_type_id: 6, food_consumed_per_day: 0.4)
   # cat.food_cost(28) = 8960
   def food_cost(days)
-    raise NotImplementedError # TODO
+    return FOOD_COST_PER_KG[@animal_type_id] * days * @food_consumed_per_day
   end
 
   # This function takes an array of pets and the `days`
@@ -90,7 +97,11 @@ def food_cost(days)
   # snake = Pet.new(name: 'python', animal_type_id: 4, food_consumed_per_day: 0.3)
   # Pet.cost_to_feed([cat, dog, fish, snake], 6) will return 6180.0
   def self.cost_to_feed(pets, days)
-    raise NotImplementedError # TODO
+    total_cost = 0
+    pets.each do |pet|
+      total_cost = total_cost + pet.food_consumed_per_day*days*FOOD_COST_PER_KG[pet.animal_type_id]
+    end
+    return total_cost
   end
 
   # This function takes an array of pets as input
@@ -109,7 +120,21 @@ def self.cost_to_feed(pets, days)
   # }
   #
   # Note - Order is not important
-  def self.group_by_animal_type(pets)
-    raise NotImplementedError # TODO
-  end
+
+
+
+    def self.group_by_animal_type(pets)
+      result = {}
+
+      pets.each do |pet|
+        if result[pet.animal_type_id]
+          result[pet.animal_type_id] << pet.name
+        else
+          result[pet.animal_type_id] = [pet.name]
+        end
+      end
+
+      result
+    end
+
 end

week_2/prime_numbers.rb

@@ -1,3 +1,26 @@
+
+def is_prime num
+
+  if num <= 1 then
+      return false
+  end
+
+  s = Math.sqrt(num)
+
+  s = s.floor()
+
+#   print "sqrt of #{num} is #{s}  "
+
+  while s > 1
+      if (num % s == 0) then
+          return false
+      else 
+          s = s - 1
+      end
+  end
+  return true
+end
+
 # A prime number is a whole number greater than 1
 # that cannot be exactly divided by any whole number 
 # other than itself and 1 
@@ -14,5 +37,19 @@
 # We will raise an `ArgumentError` exception to let the caller know that
 # their function arguments were incorrect.
 def prime_numbers(n:)
-  raise NotImplementedError # TODO
+
+  if (n <= 1) then
+    raise ArgumentError
+  end
+  i = 0
+  result = []
+
+  while (i <= n)
+      if (is_prime i) then
+          result.push(i)
+      end
+      i = i +1 
+  end
+
+  return result
 end