Create DecimalToAnyBase.java

A program to convert a decimal number to any given base

Conversions/DecimalToAnyBase.java

@@ -0,0 +1,65 @@
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+
+/**
+ *
+ * @author Varun Upadhyay (https://github.com/varunu28)
+ *
+ */
+
+// Driver Program
+public class DecimalToAnyBase {
+    public static void main (String[] args) throws Exception{
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        System.out.println("Enter the decimal input below: ");
+        int decInput = Integer.parseInt(br.readLine());
+        System.out.println();
+
+        System.out.println("Enter the base below: ");
+        int base =  Integer.parseInt(br.readLine());
+        System.out.println();
+
+        System.out.println("Decimal Input" + " is: " + decInput);
+        System.out.println("Value of " + decInput + " in base " + base + " is: " + convertToAnyBase(decInput, base));
+
+        br.close();
+    }
+
+    /**
+     * This method produces a String value of any given input decimal in any base
+     * @param inp Decimal of which we need the value in base in String format
+     * @return string format of the converted value in the given base
+     */
+
+    public static String convertToAnyBase(int inp, int base) {
+        ArrayList<Character> charArr = new ArrayList<>();
+
+        while (inp > 0) {
+            charArr.add(reVal(inp%base));
+            inp /= base;
+        }
+
+        StringBuilder str = new StringBuilder(charArr.size());
+
+        for(Character ch: charArr)
+        {
+            str.append(ch);
+        }
+
+        return str.reverse().toString();
+    }
+
+    /**
+     * This method produces character value of the input integer and returns it
+     * @param num integer of which we need the character value of
+     * @return character value of input integer
+     */
+
+    public static char reVal(int num) {
+        if (num >= 0 && num <= 9)
+            return (char)(num + '0');
+        else
+            return (char)(num - 10 + 'A');
+    }
+}