Add Decimal_To_Octal (#109)

* Add Decimal_To_Octal

* Rename Decimal_To_Octal to Decimal_To_Octal.kt

* Rename Octal_To_Decimal to Octal_To_Decimal.kt

Author: sachincool

CONTRIBUTORS.md

@@ -4,3 +4,4 @@ Ravi Kant Garg (garg-ravi24)
 Sumit Gupta(Invincisumit)
 Shifali Gupta (Gupta-shifali)
 Mohit Sharma (ms10398)
+Harshit Luthra (sachincool)

Kotlin/Conversions/Decimal_To_Octal.kt

@@ -0,0 +1,21 @@
+fun main(args: Array<String>)   //Main function 
+{
+    val decimal = 18  //Let's  Take a  number for Example
+    val octal = DecimalToOctal(decimal)
+    println("$decimal in decimal = $octal in octal")   //calling decimal and octal inside "" 
+}
+
+fun DecimalToOctal(decimal: Int): Int  // Our main function which converts  decimal to octal 
+{ 
+    var decimal = decimal
+    var octalNumber = 0
+    var i = 1
+
+    while (decimal != 0) {
+        octalNumber += decimal % 8 * i
+        decimal /= 8
+        i *= 10
+}
+
+    return octalNumber
+}

Kotlin/Conversions/Octal_To_Decimal.kt

@@ -0,0 +1,21 @@
+fun main(args: Array<String>)  //Main Function
+{
+    val octal = 18
+    val decimal = OctalToDecimal(octal)  
+    println("$octal in octal = $decimal in decimal")   //This is the method to print variable inside Quotes
+}
+
+fun OctalToDecimal(octal: Int): Int  // Conversion Function  With Return type Int
+{
+    var octal = octal 
+    var decimalNumber = 0
+    var i = 0
+
+    while (octal != 0) {
+        decimalNumber += (octal % 10 * Math.pow(8,i).toInt())    //Easy Peasy right ?  We need to Convert The Math.pow to Integer.
+        ++i
+        octal /= 10
+    }
+
+    return decimalNumber                   //No Semicolon Weeeeee!!
+}