Jackie's Binary to Decimal and Print Binary

lib/binary_to_decimal.rb

@@ -5,5 +5,13 @@
 # Calculate  and return the decimal value for this binary number using
 # the algorithm you devised in class.
 def binary_to_decimal(binary_array)
-  raise NotImplementedError
+  decimal_value = 0
+
+  idx = binary_array.length - 1
+  binary_array.length.times do |i|
+    decimal_value +=  (binary_array[i] * (2 ** idx))
+    idx -= 1
+  end
+
+  decimal_value
 end

lib/printbinary.rb

@@ -0,0 +1,40 @@
+#uses rand method, which might be cheating?
+def print_binary
+  all_values = []
+
+  until all_values.length == 16
+    four_bits = []
+    4.times do
+      four_bits << rand(0..1).to_s
+    end
+    if !all_values.include? four_bits
+      all_values << four_bits
+    end
+  end
+
+  all_values.map! {|sequence| sequence.join }
+
+  puts "#{all_values}"
+end
+
+def print_binary2
+  bits = []
+  binary = ""
+
+  16.times do |num|
+    binary = ""
+    until binary.length == 4
+      if num % 2 == 0
+        binary = "0" + binary
+      else
+        binary = "1" + binary
+      end
+        num = num >> 1
+    end
+    bits << binary
+  end
+
+puts bits
+end
+
+print_binary2