Branches - Brianna K

lib/binary_to_decimal.rb

@@ -1,9 +1,11 @@
-# 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
-end
+  length = binary_array.length - 1
+  decimal_value = 0
+
+  binary_array.each do |binary_value|
+    temp_value = (binary_value * (2 ** length))
+    decimal_value += temp_value
+    length -= 1
+  end
+  return decimal_value
+end

test/binary_to_decimal_test.rb

@@ -2,32 +2,34 @@
 require 'minitest/reporters'
 require_relative '../lib/binary_to_decimal'
 
+Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
+
 describe "binary to decimal" do
   it "From 10011001 to 153" do
     binary_array = [1, 0, 0, 1, 1, 0, 0, 1]
     expected_decimal = 153
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
-
+  
   it "From 00001101 to 13" do
     binary_array = [0, 0, 0, 0, 1, 1, 0, 1]
     expected_decimal = 13
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
-
+  
   it "From 10000000 to 128" do
     binary_array = [1, 0, 0, 0, 0, 0, 0, 0]
     expected_decimal = 128
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
-
+  
   it "From random binary to decimal" do
     binary_array = Array.new(8) { rand(0..1) }
     expected_decimal = binary_array.join.to_s.to_i(2)
-
+    
     binary_to_decimal(binary_array).must_equal expected_decimal
   end
 end