Mathematically calculating decimal to binary (java) -

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I have a problem with my algorithm to change a decimal number without using parsing in the binary number, This is the related section code: 

  public static zero dtb () {System.out.print ("\ nDenary number to change (less than 255):"); // eight bit conversion intron num = sc.nextInt (); Int decVal = 128; Int saveNum = num; // save point for first input int [arr]; Arr = new int [8]; {If (num - decVal> 0) {// Binary decimal decimal number = num - decVal; Arr [x] = 1; } And arrival [x] = 0; DecVal = decVal / 2; X ++; } While (DCVil! = 1); System.out.print ("\" "+ saveNum +" binary value is: "+ arr [0] + ARR [1] + ARR [2] + ARR [3] + ARR [4] + ARR [5] + AR [6] + Arrivals [7]);}   
 x is declared initially, therefore out of sight. I also know where the error is , But I can not work properly to do this, so ask for help, I'm also quite new, so any help on other methods would be appreciated. For example, output = (input = 42) 00101000   
 
 
 You need to compare it Is  num - decVal   or equal  to  0  because you have  & gt;  , Then it is equal to  0  and you are not forgeting  1  bit.  
  if (num - decVal> = 0) {  
 In addition, you will need a loop, while  decVal  is not equal to  0 , etc. Instead  1 , or you'll miss the last bit odd number.  
 } while (decVal! = 0);   
 Output with changes:  
  Binary value of 42 is: 00101010 43 Binary value is: 00101011

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