十进制转二进制

Question

Code is mostly done but my code is printing incorrectly its printing out as 110 as opposed to 011. The problem im doing requires to reverse the "110" to "011"

import java.util.Scanner; 

public class LabProgram {   
    public static void main(String[] args) { 

Scanner scan = new Scanner(System.in);


   int num, binaryNum = 0;
   int i = 1, rem;

   num = scan.nextInt();

   while (num != 0)
   {
      rem = num % 2;
      num /= 2;
      binaryNum += rem * i;
      i *= 10;
   }


 System.out.println(binaryNum);
}
}

Answer 1

Then use a string as follows:

   int num = scan.nextInt();

   String s = "";
   while (num != 0) {
    int   rem = num % 2;
      num /= 2;
      s = s + rem; // this concatenates the digit to the string in reverse order.

      // if you want it in normal order, do it ->  s = rem + s;
   }
   System.out.println(s);

Answer 2

You can simply use Integer#toBinaryString(int) to return the result as a binary string.

        Scanner scan = new Scanner(System.in);

        int value = scan.nextInt();

        System.out.println(Integer.toBinaryString(value));

Answer 3

You may directly print each binary digit without storing it in binaryNum

while (num != 0) {
    System.out.print(num % 2);
    num /= 2;
}

System.out.println();