Binary_and_decimal

lib/binary_to_decimal.rb

@@ -4,6 +4,56 @@
 # 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
+# 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.
+#
+array = []
+8.times do
+  array << rand(2)
+end
+
+def binary_to_decimal(array)
+  puts array.join("")
+  result = (array[0] * 2**7) + (array[1] * 2**6) + (array[2] * 2**5) + (array[3] * 2**4) + (array[4] * 2**3) + (array[5] * 2**2) + (array[6] * 2**1) + (array[7] * 2**0)
+  return result
+end
+
+puts binary_to_decimal(array)
+
+def array_equals(array1,array2)
+  if array1.length != array2.length
+    return false
+  end
+  i = 0
+  array1.length.times do
+    if array1[i] != array2[i]
+      return false
+    end
+    i += 1
+  end
+  return true
+end
+
+def decimal_to_binary(num)
+  zeros_and_ones = []
+
+  until num == 0 do
+    num / 2
+    if num % 2 == 1
+      zeros_and_ones << 1
+    else
+      zeros_and_ones << 0
+    end
+    num = num / 2
+  end
+
+  binary = []
+
+  zeros_and_ones.length.times { |i| binary << zeros_and_ones[(i + 1) * -1] }
+
+  return binary.join("")
 end