Java Exercises: Convert a binary number to a Octal number

Java Basic: Exercise-24 with Solution

Write a Java program to convert a binary number to a Octal number.

Binary number: A binary number is a number expressed in the base-2 numeral system or binary numeral system. This system uses only two symbols: typically 0(zero) and 1(one).

Octal number: The octal numeral system is the base-8 number system, and uses the digits 0 to 7.

Test Data:
Input a binary number: 111

Pictorial Presentation: Binary to Octal number

Sample Solution:

Java Code:

import java.util.*;
public class Exercise24 {
public static void main(String[] args) 
    {
        int binnum, binnum1,rem, decnum=0, quot, i=1, j;
        int octnum[] = new int[100];
        Scanner scan = new Scanner(System.in);
		System.out.print("Input a Binary Number : ");
        binnum = scan.nextInt();
        binnum1=binnum;
     
      while(binnum > 0)
        {
            rem = binnum % 10;
            decnum = decnum + rem*i;
            //System.out.println(rem);
            i = i*2;
            binnum = binnum/10;
        }   

		i=1;
        quot = decnum;
		
        while(quot > 0)
        {
            octnum[i++] = quot % 8;
            quot = quot / 8;
        }
		
        System.out.print("Equivalent Octal Value of " +binnum1+ " is :");
        for(j=i-1; j>0; j--)
        {
            System.out.print(octnum[j]);
        }
 System.out.print("\n");
 
    }
}

Sample Output:

Enter Binary Number : 111                                                                                     
Equivalent Octal Value of 111 is :7  

Flowchart:

Java Code Editor:

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