Create HextoDec.java

Program that converts Hexadecimal numbers to decimal.

Conversions/HexToOct.java

@@ -0,0 +1,49 @@
+/* Java Program - Convert Hexadecimal to Octal 
+Author - Tanmay Joshi*/
+		
+import java.util.Scanner;
+
+public class HexToOct
+{
+    public static int hex2decimal(String s)
+    {
+             String str = "0123456789ABCDEF";
+             s = s.toUpperCase();
+             int val = 0;
+             for (int i = 0; i < s.length(); i++)
+             {
+                 char a = s.charAt(i);
+                 int n = str.indexOf(a);
+                 val = 16*val + n;
+             }
+             return val;
+    }
+    public static void main(String args[])
+    {
+        String hexadecnum;
+        int decnum, i=1, j;
+        int octnum[] = new int[100];
+        Scanner scan = new Scanner(System.in);
+		
+        System.out.print("Enter Hexadecimal Number : ");
+        hexadecnum = scan.nextLine();
+        
+        // first convert hexadecimal to decimal
+        
+        decnum = hex2decimal(hexadecnum);
+        
+        // convert decimal to octal
+        
+        while(decnum != 0)
+        {
+            octnum[i++] = decnum%8;
+            decnum = decnum/8;
+        }
+		
+        System.out.print("Equivalent Octal Number is :\n");
+        for(j=i-1; j>0; j--)
+        {
+            System.out.print(octnum[j]);
+        }
+    }
+}