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package Conversions;

/** @author Varun Upadhyay (https://github.com/varunu28) */

// Driver program

public class AnyBaseToDecimal {

public static void main(String[] args) {

assert convertToDecimal("1010", 2) == Integer.valueOf("1010", 2);

assert convertToDecimal("777", 8) == Integer.valueOf("777", 8);

assert convertToDecimal("999", 10) == Integer.valueOf("999", 10);

assert convertToDecimal("ABCDEF", 16) == Integer.valueOf("ABCDEF", 16);

assert convertToDecimal("XYZ", 36) == Integer.valueOf("XYZ", 36);

}

/**

* Convert any radix to decimal number

*

* @param s the string to be convert

* @param radix the radix

* @return decimal of bits

* @throws NumberFormatException if {@code bits} or {@code radix} is invalid

*/

public static int convertToDecimal(String s, int radix) {

int num = 0;

int pow = 1;

for (int i = s.length() - 1; i >= 0; i--) {

int digit = valOfChar(s.charAt(i));

if (digit >= radix) {

throw new NumberFormatException("For input string " + s);

}

num += valOfChar(s.charAt(i)) * pow;

pow *= radix;

}

return num;

}

/**

* Convert character to integer

*

* @param c the character

* @return represented digit of given character

* @throws NumberFormatException if {@code ch} is not UpperCase or Digit character.

*/

public static int valOfChar(char c) {

if (!(Character.isUpperCase(c) || Character.isDigit(c))) {

throw new NumberFormatException("invalid character :" + c);

}

return Character.isDigit(c) ? c - '0' : c - 'A' + 10;

}

}