Java Decimal to Binary decimalToBitString(int n, int min, int max)

Description

decimal To Bit String

License

Open Source License

Declaration

public static String decimalToBitString(int n, int min, int max) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static String decimalToBitString(int n, int min, int max) {
        max -= min;//from  w ww .  j a va 2 s.co  m
        n -= min;
        if (max == 0 || n < 0 || n > max) {
            return "";
        }
        // find biggest power of 2 that fits between min and max
        int biggestPower = (int) logBaseN(max + 1, 2);
        int maxInBiggestPower = (int) Math.pow(2, biggestPower);
        if (n < maxInBiggestPower) {
            // n is translated to bits assuming the biggest power. The returned bit string will have "biggestPower" bits
            String bitString = Integer.toBinaryString(n);
            while (bitString.length() < biggestPower) {
                bitString = "0" + bitString;
            }
            return bitString;
        } else {
            // substract the biggest power range and recalculate
            return decimalToBitString(n - maxInBiggestPower, 0, max - maxInBiggestPower);
        }
    }

    public static double logBaseN(double n, double base) {
        return Math.log(n) / Math.log(base);
    }
}

Related

1. dec2bin(int dec)
2. dec2bin(Integer str)
3. decimalToBinaryString(int n)