From ff716d1f4c294f9f0a761b505a2890ef4927d8ac Mon Sep 17 00:00:00 2001
From: Vitor Oliveira <vbrazo@gmail.com>
Date: Sat, 6 Mar 2021 12:05:56 -0800
Subject: [PATCH 1/6] Rename file

---
 maths/{iterative_decimal_to_binary.rb => decimal_to_binary.rb} | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename maths/{iterative_decimal_to_binary.rb => decimal_to_binary.rb} (100%)

diff --git a/maths/iterative_decimal_to_binary.rb b/maths/decimal_to_binary.rb
similarity index 100%
rename from maths/iterative_decimal_to_binary.rb
rename to maths/decimal_to_binary.rb

From cef59e1094f9b416e7a53b6ad87ba17e73261940 Mon Sep 17 00:00:00 2001
From: Vitor Oliveira <vbrazo@gmail.com>
Date: Sat, 6 Mar 2021 12:16:43 -0800
Subject: [PATCH 2/6] Add recursive approach

---
 maths/decimal_to_binary.rb | 41 +++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/maths/decimal_to_binary.rb b/maths/decimal_to_binary.rb
index 918a7d4..0feb888 100644
--- a/maths/decimal_to_binary.rb
+++ b/maths/decimal_to_binary.rb
@@ -1,17 +1,52 @@
-# Iterative method to convert a given decimal number into binary.
+# Convert a given decimal number into binary.
+
+#
+# Approach 1: Iterative
+#
 
 def decimal_to_binary(n)
-  bin = []  
+  bin = []
+
   until n.zero?
     bin << n % 2
-    n = n / 2
+    n /= 2
   end
+
   bin.reverse.join
 end
 
 puts 'Binary value of 4 is ' + decimal_to_binary(4).to_s
 # Binary value of 4 is 100
+
 puts 'Binary value of 31 is ' + decimal_to_binary(31).to_s
 # Binary value of 31 is 11111
+
+puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
+# Binary value of 64 is 1000000
+
+#
+# Approach 2: Recursive
+#
+
+def decimal_to_binary(d)
+  binary = (d % 2).to_s
+
+  if d == 0
+    return binary
+  elsif d == 1
+    return 1.to_s
+  else
+    binary += decimal_to_binary(d / 2).to_s
+  end
+
+  binary.to_i
+end
+
+puts 'Binary value of 4 is ' + decimal_to_binary(4).to_s
+# Binary value of 4 is 100
+
+puts 'Binary value of 31 is ' + decimal_to_binary(31).to_s
+# Binary value of 31 is 11111
+
 puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
 # Binary value of 64 is 1000000

From 06724c2502ae057ade021adc0df3899f70051426 Mon Sep 17 00:00:00 2001
From: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Date: Sat, 6 Mar 2021 20:17:04 +0000
Subject: [PATCH 3/6] updating DIRECTORY.md

---
 DIRECTORY.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/DIRECTORY.md b/DIRECTORY.md
index e3f395f..f46c03d 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -37,7 +37,7 @@
   * [Binary To Decimal](https://github.com/TheAlgorithms/Ruby/blob/master/maths/binary_to_decimal.rb)
   * [Ceil](https://github.com/TheAlgorithms/Ruby/blob/master/maths/ceil.rb)
   * [Ceil Test](https://github.com/TheAlgorithms/Ruby/blob/master/maths/ceil_test.rb)
-  * [Iterative Decimal To Binary](https://github.com/TheAlgorithms/Ruby/blob/master/maths/iterative_decimal_to_binary.rb)
+  * [Decimal To Binary](https://github.com/TheAlgorithms/Ruby/blob/master/maths/decimal_to_binary.rb)
   * [Number Of Digits](https://github.com/TheAlgorithms/Ruby/blob/master/maths/number_of_digits.rb)
   * [Square Root](https://github.com/TheAlgorithms/Ruby/blob/master/maths/square_root.rb)
   * [Square Root Test](https://github.com/TheAlgorithms/Ruby/blob/master/maths/square_root_test.rb)

From f1051324d063de684355cbb4544d104974c88dee Mon Sep 17 00:00:00 2001
From: Vitor Oliveira <vbrazo@gmail.com>
Date: Sat, 6 Mar 2021 12:18:27 -0800
Subject: [PATCH 4/6] Update decimal_to_binary.rb

---
 maths/decimal_to_binary.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/maths/decimal_to_binary.rb b/maths/decimal_to_binary.rb
index 0feb888..40dce3b 100644
--- a/maths/decimal_to_binary.rb
+++ b/maths/decimal_to_binary.rb
@@ -24,6 +24,7 @@ puts 'Binary value of 31 is ' + decimal_to_binary(31).to_s
 puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
 # Binary value of 64 is 1000000
 
+
 #
 # Approach 2: Recursive
 #

From 4df383c9023b1b30a0ab675a38b39a8e545d1bbb Mon Sep 17 00:00:00 2001
From: Vitor Oliveira <vbrazo@gmail.com>
Date: Sat, 6 Mar 2021 12:29:31 -0800
Subject: [PATCH 5/6] Fix issue

---
 maths/decimal_to_binary.rb | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/maths/decimal_to_binary.rb b/maths/decimal_to_binary.rb
index 40dce3b..839a656 100644
--- a/maths/decimal_to_binary.rb
+++ b/maths/decimal_to_binary.rb
@@ -24,7 +24,6 @@ puts 'Binary value of 31 is ' + decimal_to_binary(31).to_s
 puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
 # Binary value of 64 is 1000000
 
-
 #
 # Approach 2: Recursive
 #
@@ -32,13 +31,10 @@ puts 'Binary value of 64 is ' + decimal_to_binary(64).to_s
 def decimal_to_binary(d)
   binary = (d % 2).to_s
 
-  if d == 0
-    return binary
-  elsif d == 1
-    return 1.to_s
-  else
-    binary += decimal_to_binary(d / 2).to_s
-  end
+  return binary if d == 0
+  return 1.to_s if d == 1
+
+  binary = decimal_to_binary(d / 2).to_s + binary
 
   binary.to_i
 end

From fafb2f0c18bdb87b84bf3d84746ba1e1913ba0d8 Mon Sep 17 00:00:00 2001
From: Vitor Oliveira <vbrazo@gmail.com>
Date: Sun, 7 Mar 2021 09:26:28 -0800
Subject: [PATCH 6/6] keep the return consistent in recursive and iterative

---
 maths/decimal_to_binary.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/maths/decimal_to_binary.rb b/maths/decimal_to_binary.rb
index 839a656..fa0110d 100644
--- a/maths/decimal_to_binary.rb
+++ b/maths/decimal_to_binary.rb
@@ -36,7 +36,7 @@ def decimal_to_binary(d)
 
   binary = decimal_to_binary(d / 2).to_s + binary
 
-  binary.to_i
+  binary
 end
 
 puts 'Binary value of 4 is ' + decimal_to_binary(4).to_s