Finished code

lib/binary_to_decimal.rb

@@ -1,9 +1,27 @@
-# A method named `binary_to_decimal` that receives as input an array of size 8.
-# The array is randomly filled with 0’s and 1’s.
-# The most significant bit is at index 0.
-# The least significant bit is at index 7.
-# 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
+#Write a method named binary_to_decimal that receives as input parameter an array of size 8. The array is randomly filled
+# with 0’s and 1’s. Assuming that the array represents an eight bit binary number with the most significant bit at index
+# 0 and the least significant bit at index 7, calculate the decimal value for this binary number using the algorithm you
+# devised in class. Return the decimal value.
+#
+# Note: Do not use Ruby functions. You may use .length method on the array and retrieve values at a particular index in
+# the array. Author using the algorithm you devised in class.
+#
+# You may however write your own versions of these methods
+
+#test_array = [1, 0, 1, 1, 0, 0, 1, 1]
+# the decimal number of test array should be 179
+
+def binary_to_decimal(array)
+  bit_1 = array[0] * (2**7)
+  bit_2 = array[1] * (2**6)
+  bit_3 = array[2] * (2**5)
+  bit_4 = array[3] * (2**4)
+  bit_5 = array[4] * (2**3)
+  bit_6 = array[5] * (2**2)
+  bit_7 = array[6] * (2**1)
+  bit_8 = array[7] * (2**0)
+  result = bit_1 + bit_2 + bit_3 + bit_4 + bit_5 + bit_6 + bit_7 + bit_8
+  return result
 end
+
+#puts binary_to_decimal(test_array)