In this program, you’ll learn to convert binary number to a octal number and vice-versa using functions in Java.
Example 1: Program to Convert Binary to Octal
In this program, we will first convert binary number to decimal. Then, the decimal number is converted to octal.
class Main { public static void main(String[] args) { long binary = 101001; int octal = convertBinarytoOctal(binary); System.out.println(binary + " in binary = " + octal + " in octal"); } public static int convertBinarytoOctal(long binaryNumber) { int octalNumber = 0, decimalNumber = 0, i = 0; while (binaryNumber != 0) { decimalNumber += (binaryNumber % 10) * Math.pow(2, i); ++i; binaryNumber /= 10; } i = 1; while (decimalNumber != 0) { octalNumber += (decimalNumber % 8) * i; decimalNumber /= 8; i *= 10; } return octalNumber; } }
Output
101001 in binary = 51 in octal
This conversion takes place as:
Binary To Decimal 1 * 25 + 0 * 24 + 1 * 23 + 0 * 22 + 0 * 21 + 1 * 20 = 41 Decimal to Octal 8 | 41 8 | 5 -- 1 8 | 0 -- 5 (51)
Example 2: Program to Convert Octal to Binary
In this program, the octal number to decimal to decimal at first. Then, the decimal number is converted to binary number.
class Main { public static void main(String[] args) { int octal = 67; long binary = convertOctalToBinary(octal); System.out.println(octal + " in octal = " + binary + " in binary"); } public static long convertOctalToBinary(int octalNumber) { int decimalNumber = 0, i = 0; long binaryNumber = 0; while (octalNumber != 0) { decimalNumber += (octalNumber % 10) * Math.pow(8, i); ++i; octalNumber /= 10; } i = 1; while (decimalNumber != 0) { binaryNumber += (decimalNumber % 2) * i; decimalNumber /= 2; i *= 10; } return binaryNumber; } }
Output
67 in octal = 110111 in binary
This conversion takes place as:
Octal To Decimal 6 * 81 + 7 * 80 = 55 Decimal to Binary 2 | 55 2 | 27 -- 1 2 | 13 -- 1 2 | 6 -- 1 2 | 3 -- 0 2 | 1 -- 1 2 | 0 -- 1 (110111)
