# Conversion from binary to octal in java

Java program for Conversion from binary to octal. Here mentioned other language solution.

``````/*
Java program for
Convert Binary number into Octal number
*/
public class Convert
{
// Convert decimal number into octal
public int octal(int number)
{
int result = 0, multiplier = 1;
int remainder = 0;
while (number != 0)
{
remainder = number % 8;
result = (remainder * multiplier) + result;
multiplier *= 10;
number = number / 8;
}
return result;
}
public void binaryToOctal(String num)
{
if (num.length() == 0)
{
// When empty binary number
return;
}
// Some useful variable
boolean flag = false;
int decimalNo = 0, counter = 0;
int index = num.length() - 1;
// We Assume that given binary number is valid
// Here - indicates negative binary number
// First convert binary to decimal
// Example = 10111 => 23
while (index >= 0)
{
if (num.charAt(index) == '1')
{
decimalNo += (1 << counter);
}
else if (num.charAt(index) != '0')
{
if (index == 0 && num.charAt(index) == '-')
{
// When get negative number
flag = true;
}
else
{
// Not a valid binary number
return;
}
}
counter += 1;
index -= 1;
}
// When given number is
int output = octal(decimalNo);
if (flag == true)
{
output = -output;
}
// Display given number
System.out.print("Binary : " + num);
// Display result
System.out.println(" Octal : " + output);
}
public static void main(String[] args)
{
// Test Case
}
}``````

Output

``````Binary : 1111 Octal : 17
Binary : 10111 Octal : 27
Binary : 101011 Octal : 53
Binary : 11011 Octal : 33
Binary : -1000110 Octal : -106``````

## Comment

Please share your knowledge to improve code and content standard. Also submit your doubts, and test case. We improve by your feedback. We will try to resolve your query as soon as possible.