Add Octal To Binary Converter (#4202)

src/main/java/com/thealgorithms/conversions/OctalToBinary.java

@@ -0,0 +1,42 @@
+package com.thealgorithms.conversions;
+import java.util.Scanner;
+
+/**
+ * Converts any Octal Number to a Binary Number
+ *
+ * @author Bama Charan Chhandogi
+ */
+
+public class OctalToBinary {
+    public static long convertOctalToBinary(int octalNumber) {
+        long binaryNumber = 0;
+        int digitPosition = 1;
+
+        while (octalNumber != 0) {
+            int octalDigit = octalNumber % 10;
+            long binaryDigit = convertOctalDigitToBinary(octalDigit);
+
+            binaryNumber += binaryDigit * digitPosition;
+
+            octalNumber /= 10;
+            digitPosition *= 1000; // Move to the next group of 3 binary digits
+        }
+
+        return binaryNumber;
+    }
+
+    public static long convertOctalDigitToBinary(int octalDigit) {
+        long binaryDigit = 0;
+        int binaryMultiplier = 1;
+
+        while (octalDigit != 0) {
+            int octalDigitRemainder = octalDigit % 2;
+            binaryDigit += octalDigitRemainder * binaryMultiplier;
+
+            octalDigit /= 2;
+            binaryMultiplier *= 10;
+        }
+
+        return binaryDigit;
+    }
+}

src/test/java/com/thealgorithms/conversions/OctalToBinaryTest.java

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+package com.thealgorithms.conversions;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class OctalToBinaryTest {
+    @Test
+    public void testConvertOctalToBinary() {
+        assertEquals(101, OctalToBinary.convertOctalToBinary(5));
+        assertEquals(1001, OctalToBinary.convertOctalToBinary(11));
+        assertEquals(101010, OctalToBinary.convertOctalToBinary(52));
+        assertEquals(110, OctalToBinary.convertOctalToBinary(6));
+    }
+}