From df085d0e1dee6952f45512511a4e3a97a2368f29 Mon Sep 17 00:00:00 2001
From: Adan Rodriguez <adanrodriguezthis33@gmail.com>
Date: Sun, 3 Feb 2019 17:39:11 -0300
Subject: [PATCH] convert decimal to octal value

---
 .../java/com/conversions/DecimalToOctal.java  | 26 +++++++++++++++++++
 .../com/conversions/DecimalToOctalTest.java   | 16 ++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 src/main/java/com/conversions/DecimalToOctal.java
 create mode 100644 src/test/java/com/conversions/DecimalToOctalTest.java

diff --git a/src/main/java/com/conversions/DecimalToOctal.java b/src/main/java/com/conversions/DecimalToOctal.java
new file mode 100644
index 00000000..743b0e0a
--- /dev/null
+++ b/src/main/java/com/conversions/DecimalToOctal.java
@@ -0,0 +1,26 @@
+package src.main.java.com.conversions;
+
+import java.math.BigInteger;
+
+public class DecimalToOctal {
+    private static final char octalChars[] = {'0','1','2','3','4','5','6','7'};
+    private static final BigInteger valueOctal = new BigInteger("8");
+
+    /**
+     * This method converts and decimal number to a octal number
+     * @param decimalStr
+     * @return octal number
+     */
+    public String decimalToOctal(String decimalStr){
+        BigInteger decimal = new BigInteger(decimalStr);
+
+        int rem;
+        String octal = "";
+        while(decimal.compareTo(BigInteger.ZERO) > 0) {
+            rem = decimal.mod(valueOctal).intValueExact();
+            octal = octalChars[rem] + octal;
+            decimal = decimal.divide(valueOctal);
+        }
+        return octal;
+    }
+}
diff --git a/src/test/java/com/conversions/DecimalToOctalTest.java b/src/test/java/com/conversions/DecimalToOctalTest.java
new file mode 100644
index 00000000..1916b7ef
--- /dev/null
+++ b/src/test/java/com/conversions/DecimalToOctalTest.java
@@ -0,0 +1,16 @@
+package src.test.java.com.conversions;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DecimalToOctalTest {
+    @Test
+    public void testDecimalToOctalTest() {
+        DecimalToOctal decimalToOctal = new DecimalToOctal();
+        Assert.assertEquals("Incorrect Conversion", "41", decimalToOctal.decimalToOctal("33"));
+        Assert.assertEquals("Incorrect Conversion", "5512", decimalToOctal.decimalToOctal("2890"));
+        Assert.assertEquals("Incorrect Conversion", "12525252525252525252525241", decimalToOctal.decimalToOctal("50371909150609548946081"));
+        Assert.assertEquals("Incorrect Conversion", "13", decimalToOctal.decimalToOctal("11"));
+        Assert.assertEquals("Incorrect Conversion", "46703754", decimalToOctal.decimalToOctal("10192876"));
+    }
+}