input: Write a function to convert a number into binary format. If the number is 0, return 0. Otherwise, initialize an empty binary string and loop through the number to get the remainder which represents the bits of the binary. Return the binary string.
  def convert_to_binary(num):
      if num == 0:
          return 0
      binary = ''
      while num != 0:
          remainder = num % 2
          binary = str(remainder) + binary
          num = num // 2
      return binary
  
  assert convert_to_binary(10) == "1010"
  assert convert_to_binary(0) == 0
  assert convert_to_binary(7) == "111"
  assert convert_to_binary(15) == "1111"
  assert convert_to_binary(32) == "100000"
output: def convert_to_binary(num):
      if num == 0:
          return 0
      binary = ''
      while num != 0:
          remainder = num % 2
          binary = str(remainder) + binary
          num = num // 2
      return binary