Main.java Source code

Introduction

Here is the source code for Main.java

Source

public class Main {
    public static String ConvertToHexadecimal(int num) {
        int r;
        String bin = "\0";
        do {
            r = num % 16;
            num = num / 16;

            if (r == 10)
                bin = "A" + bin;

            else if (r == 11)
                bin = "B" + bin;

            else if (r == 12)
                bin = "C" + bin;

            else if (r == 13)
                bin = "D" + bin;

            else if (r == 14)
                bin = "E" + bin;

            else if (r == 15)
                bin = "F" + bin;

            else
                bin = r + bin;
        } while (num != 0);

        return bin;
    }

    public static int ConvertFromHexadecimalToDecimal(String num) {
        int a;
        int ctr = 0;
        double prod = 0;

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

            if (num.charAt(i - 1) == 'a' || num.charAt(i - 1) == 'A')
                a = 10;

            else if (num.charAt(i - 1) == 'b' || num.charAt(i - 1) == 'B')
                a = 11;

            else if (num.charAt(i - 1) == 'c' || num.charAt(i - 1) == 'C')
                a = 12;

            else if (num.charAt(i - 1) == 'd' || num.charAt(i - 1) == 'D')
                a = 13;

            else if (num.charAt(i - 1) == 'e' || num.charAt(i - 1) == 'E')
                a = 14;

            else if (num.charAt(i - 1) == 'f' || num.charAt(i - 1) == 'F')
                a = 15;

            else
                a = Character.getNumericValue(num.charAt(i - 1));
            prod = prod + (a * Math.pow(16, ctr));
            ctr++;
        }
        return (int) prod;
    }

    public static void main(String[] args) {
        int num;
        String numS;
        num = 123;
        System.out.println(ConvertToHexadecimal(num));
        numS = "123";
        System.out.println(ConvertFromHexadecimalToDecimal(numS));
    }
}