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DecimalToAnyBase.java

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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');

}