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AnyBaseToDecimal.java

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import java.io.BufferedReader;

import java.io.InputStreamReader;

/**

*

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

*

*/

// Driver program

public class AnyBaseToDecimal {

public static void main (String[] args) throws Exception{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String inp = br.readLine();

int base = Integer.parseInt(br.readLine());

System.out.println("Input in base " + base + " is: " + inp);

System.out.println("Decimal value of " + inp + " is: " + convertToDecimal(inp, base));

br.close();

}

/**

* This method produces a decimal value of any given input number of any base

* @param inp_num String of which we need the decimal value and base in integer format

* @return string format of the decimal value

*/

public static String convertToDecimal(String inp_num, int base) {

int len = inp_num.length();

int num = 0;

int pow = 1;

for (int i=len-1; i>=0; i--) {

if (valOfChar(inp_num.charAt(i)) >= base) {

return "Invalid Number";

}

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

pow *= base;

}

return String.valueOf(num);

}

/**

* This method produces integer value of the input character and returns it

* @param c Char of which we need the integer value of

* @return integer value of input char

*/

public static int valOfChar(char c) {

if (c >= '0' && c <= '9') {

return (int)c - '0';

}

else {

return (int)c - 'A' + 10;

}

}

}