Binary Converter - Netbeans Java Codes

You can also download text file of this code here: BinaryConverter.txt

Java Code:

public class BinaryConv {
public static void main(String[] args) {
  Scanner in = new Scanner(System.in);
  int decimalNumber;
  String binaryNumber;
  System.out.print("Enter a positive integer: ");
  decimalNumber = in.nextInt();
  if (decimalNumber <= 0)
   System.out.println("ERROR: entered integer is nonpositive.");
  else {
   binaryNumber = "";
// algorithm step by step
// initial: binaryNumber = "", decimalNumber = 123
// step 1 : binaryNumber = "1 ", decimalNumber = 61
// step 2 : binaryNumber = "11 ", decimalNumber = 30
// step 3 : binaryNumber = "011 ", decimalNumber = 15
// step 4 : binaryNumber = "1011 ", decimalNumber = 7
// step 5 : binaryNumber = "1 1011 ", decimalNumber = 3
// step 6 : binaryNumber = "11 1011 ", decimalNumber = 1
// step 6 : binaryNumber = "111 1011 ", decimalNumber = 0
// stop   : (decimalNumber != 0)
   while (decimalNumber != 0) {
// add spaces to separate 4-digit groups 
    if (binaryNumber.length() % 5 == 0)
     binaryNumber = " " + binaryNumber;
// extract last digit in binary representation
// and add it to binaryNumber [Find More Java Codes at www.sumikuma.tk]
    binaryNumber = (decimalNumber % 2) + binaryNumber;
// cut last digit in binary representation
    decimalNumber /= 2;
   }
   System.out.println("Binary: " + binaryNumber);
  }
 }
}

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