Decimal to octal conversion

1) Using predefined method Integer.toOctalString(int num)
2) Writing our own logic for conversion

import java.util.Scanner;

class DecimalToOctalExample

{

  public static void main(String args[])

  {

    Scanner input = new Scanner( System.in );

    System.out.print("Enter a decimal number : ");

    int num =input.nextInt();

    /* Method 1: 

     * Using predefined method toOctalString(int)

     * Pass the decimal number to this method and

     * it would return the equivalent octal number

     */

    String octalString = Integer.toOctalString(num);

    System.out.println("Method 1: Decimal to octal: " + octalString);

    /* Method 2: 

     * Writing your own logic: Here we will write

     * our own logic for decimal to octal conversion

     */

    // For storing remainder

    int rem;

    // For storing result

    String str=""; 

    // Digits in Octal number system

    char dig[]={'0','1','2','3','4','5','6','7'};

    while(num>0)

    {

       rem=num%8; 

       str=dig[rem]+str; 

       num=num/8;

    }

    System.out.println("Method 2: Decimal to octal: "+str);

  }

}

Output

Enter a decimal number : 123

Method 1: Decimal to octal: 173

Method 2: Decimal to octal: 173

 

Largest of three Numbers Quotient and Remainder