input: Write a function to convert a given number into its binary format. If the number is 0, the function should return 0. The function should support positive numbers.
  def convert_to_binary(num):
      # check if the number is 0, if so return 0
      if num == 0:
          return 0
      
      # initialize an empty binary string
      binary = ''
      
      # loop through the number and get the remainder 
      # which is the bits of the 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(3)=='11'
  assert convert_to_binary(1)=='1'
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